├── .gitignore
├── .swiftpm
    └── xcode
    │   ├── package.xcworkspace
    │       └── contents.xcworkspacedata
    │   └── xcshareddata
    │       └── xcschemes
    │           └── ECTimelineView.xcscheme
├── Example
    ├── ECTimelineViewExample.xcodeproj
    │   ├── project.pbxproj
    │   └── project.xcworkspace
    │   │   ├── contents.xcworkspacedata
    │   │   └── xcshareddata
    │   │       ├── IDEWorkspaceChecks.plist
    │   │       └── swiftpm
    │   │           └── Package.resolved
    ├── ECTimelineViewExample
    │   ├── AppDelegate.swift
    │   ├── Assets.xcassets
    │   │   ├── AccentColor.colorset
    │   │   │   └── Contents.json
    │   │   ├── AppIcon.appiconset
    │   │   │   └── Contents.json
    │   │   └── Contents.json
    │   ├── Base.lproj
    │   │   ├── LaunchScreen.storyboard
    │   │   └── Main.storyboard
    │   ├── Info.plist
    │   ├── SceneDelegate.swift
    │   └── ViewController.swift
    ├── ECTimelineViewExampleTests
    │   ├── ECTimelineViewExampleTests.swift
    │   └── Info.plist
    └── ECTimelineViewExampleUITests
    │   ├── ECTimelineViewExampleUITests.swift
    │   └── Info.plist
├── Package.resolved
├── Package.swift
├── README.md
├── Sources
    ├── ECTimelineView.swift
    ├── ECTimelineViewDataSource.swift
    ├── Enums
    │   ├── LoadDirection.swift
    │   └── StartPosition.swift
    └── Extensions
    │   └── UICollectionView+Extensions.swift
└── Tests
    ├── ECTimelineViewTests.swift
    └── XCTestManifests.swift


/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store
2 | /.build
3 | /Packages
4 | /*.xcodeproj
5 | xcuserdata/
6 | 


--------------------------------------------------------------------------------
/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/.swiftpm/xcode/xcshareddata/xcschemes/ECTimelineView.xcscheme:
--------------------------------------------------------------------------------
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84 |    <AnalyzeAction
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86 |    </AnalyzeAction>
87 |    <ArchiveAction
88 |       buildConfiguration = "Release"
89 |       revealArchiveInOrganizer = "YES">
90 |    </ArchiveAction>
91 | </Scheme>
92 | 


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305 | 			target = 7CCE245F252A8B4B007557FE /* ECTimelineViewExample */;
306 | 			targetProxy = 7CCE2477252A8B4C007557FE /* PBXContainerItemProxy */;
307 | 		};
308 | 		7CCE2483252A8B4C007557FE /* PBXTargetDependency */ = {
309 | 			isa = PBXTargetDependency;
310 | 			target = 7CCE245F252A8B4B007557FE /* ECTimelineViewExample */;
311 | 			targetProxy = 7CCE2482252A8B4C007557FE /* PBXContainerItemProxy */;
312 | 		};
313 | /* End PBXTargetDependency section */
314 | 
315 | /* Begin PBXVariantGroup section */
316 | 		7CCE2469252A8B4B007557FE /* Main.storyboard */ = {
317 | 			isa = PBXVariantGroup;
318 | 			children = (
319 | 				7CCE246A252A8B4B007557FE /* Base */,
320 | 			);
321 | 			name = Main.storyboard;
322 | 			sourceTree = "<group>";
323 | 		};
324 | 		7CCE246E252A8B4C007557FE /* LaunchScreen.storyboard */ = {
325 | 			isa = PBXVariantGroup;
326 | 			children = (
327 | 				7CCE246F252A8B4C007557FE /* Base */,
328 | 			);
329 | 			name = LaunchScreen.storyboard;
330 | 			sourceTree = "<group>";
331 | 		};
332 | /* End PBXVariantGroup section */
333 | 
334 | /* Begin XCBuildConfiguration section */
335 | 		7CCE2488252A8B4C007557FE /* Debug */ = {
336 | 			isa = XCBuildConfiguration;
337 | 			buildSettings = {
338 | 				ALWAYS_SEARCH_USER_PATHS = NO;
339 | 				CLANG_ANALYZER_NONNULL = YES;
340 | 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
341 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
342 | 				CLANG_CXX_LIBRARY = "libc++";
343 | 				CLANG_ENABLE_MODULES = YES;
344 | 				CLANG_ENABLE_OBJC_ARC = YES;
345 | 				CLANG_ENABLE_OBJC_WEAK = YES;
346 | 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
347 | 				CLANG_WARN_BOOL_CONVERSION = YES;
348 | 				CLANG_WARN_COMMA = YES;
349 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
350 | 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
351 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
352 | 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
353 | 				CLANG_WARN_EMPTY_BODY = YES;
354 | 				CLANG_WARN_ENUM_CONVERSION = YES;
355 | 				CLANG_WARN_INFINITE_RECURSION = YES;
356 | 				CLANG_WARN_INT_CONVERSION = YES;
357 | 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
358 | 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
359 | 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
360 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
361 | 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
362 | 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
363 | 				CLANG_WARN_STRICT_PROTOTYPES = YES;
364 | 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
365 | 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
366 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
367 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
368 | 				COPY_PHASE_STRIP = NO;
369 | 				DEBUG_INFORMATION_FORMAT = dwarf;
370 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
371 | 				ENABLE_TESTABILITY = YES;
372 | 				GCC_C_LANGUAGE_STANDARD = gnu11;
373 | 				GCC_DYNAMIC_NO_PIC = NO;
374 | 				GCC_NO_COMMON_BLOCKS = YES;
375 | 				GCC_OPTIMIZATION_LEVEL = 0;
376 | 				GCC_PREPROCESSOR_DEFINITIONS = (
377 | 					"DEBUG=1",
378 | 					"$(inherited)",
379 | 				);
380 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
381 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
382 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
383 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
384 | 				GCC_WARN_UNUSED_FUNCTION = YES;
385 | 				GCC_WARN_UNUSED_VARIABLE = YES;
386 | 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
387 | 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
388 | 				MTL_FAST_MATH = YES;
389 | 				ONLY_ACTIVE_ARCH = YES;
390 | 				SDKROOT = iphoneos;
391 | 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
392 | 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
393 | 			};
394 | 			name = Debug;
395 | 		};
396 | 		7CCE2489252A8B4C007557FE /* Release */ = {
397 | 			isa = XCBuildConfiguration;
398 | 			buildSettings = {
399 | 				ALWAYS_SEARCH_USER_PATHS = NO;
400 | 				CLANG_ANALYZER_NONNULL = YES;
401 | 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
402 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
403 | 				CLANG_CXX_LIBRARY = "libc++";
404 | 				CLANG_ENABLE_MODULES = YES;
405 | 				CLANG_ENABLE_OBJC_ARC = YES;
406 | 				CLANG_ENABLE_OBJC_WEAK = YES;
407 | 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
408 | 				CLANG_WARN_BOOL_CONVERSION = YES;
409 | 				CLANG_WARN_COMMA = YES;
410 | 				CLANG_WARN_CONSTANT_CONVERSION = YES;
411 | 				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
412 | 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
413 | 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
414 | 				CLANG_WARN_EMPTY_BODY = YES;
415 | 				CLANG_WARN_ENUM_CONVERSION = YES;
416 | 				CLANG_WARN_INFINITE_RECURSION = YES;
417 | 				CLANG_WARN_INT_CONVERSION = YES;
418 | 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
419 | 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
420 | 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
421 | 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
422 | 				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
423 | 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
424 | 				CLANG_WARN_STRICT_PROTOTYPES = YES;
425 | 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
426 | 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
427 | 				CLANG_WARN_UNREACHABLE_CODE = YES;
428 | 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
429 | 				COPY_PHASE_STRIP = NO;
430 | 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
431 | 				ENABLE_NS_ASSERTIONS = NO;
432 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
433 | 				GCC_C_LANGUAGE_STANDARD = gnu11;
434 | 				GCC_NO_COMMON_BLOCKS = YES;
435 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
436 | 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
437 | 				GCC_WARN_UNDECLARED_SELECTOR = YES;
438 | 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
439 | 				GCC_WARN_UNUSED_FUNCTION = YES;
440 | 				GCC_WARN_UNUSED_VARIABLE = YES;
441 | 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
442 | 				MTL_ENABLE_DEBUG_INFO = NO;
443 | 				MTL_FAST_MATH = YES;
444 | 				SDKROOT = iphoneos;
445 | 				SWIFT_COMPILATION_MODE = wholemodule;
446 | 				SWIFT_OPTIMIZATION_LEVEL = "-O";
447 | 				VALIDATE_PRODUCT = YES;
448 | 			};
449 | 			name = Release;
450 | 		};
451 | 		7CCE248B252A8B4C007557FE /* Debug */ = {
452 | 			isa = XCBuildConfiguration;
453 | 			buildSettings = {
454 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
455 | 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
456 | 				CODE_SIGN_STYLE = Automatic;
457 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
458 | 				INFOPLIST_FILE = ECTimelineViewExample/Info.plist;
459 | 				LD_RUNPATH_SEARCH_PATHS = (
460 | 					"$(inherited)",
461 | 					"@executable_path/Frameworks",
462 | 				);
463 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExample;
464 | 				PRODUCT_NAME = "$(TARGET_NAME)";
465 | 				SWIFT_VERSION = 5.0;
466 | 				TARGETED_DEVICE_FAMILY = "1,2";
467 | 			};
468 | 			name = Debug;
469 | 		};
470 | 		7CCE248C252A8B4C007557FE /* Release */ = {
471 | 			isa = XCBuildConfiguration;
472 | 			buildSettings = {
473 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
474 | 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
475 | 				CODE_SIGN_STYLE = Automatic;
476 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
477 | 				INFOPLIST_FILE = ECTimelineViewExample/Info.plist;
478 | 				LD_RUNPATH_SEARCH_PATHS = (
479 | 					"$(inherited)",
480 | 					"@executable_path/Frameworks",
481 | 				);
482 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExample;
483 | 				PRODUCT_NAME = "$(TARGET_NAME)";
484 | 				SWIFT_VERSION = 5.0;
485 | 				TARGETED_DEVICE_FAMILY = "1,2";
486 | 			};
487 | 			name = Release;
488 | 		};
489 | 		7CCE248E252A8B4C007557FE /* Debug */ = {
490 | 			isa = XCBuildConfiguration;
491 | 			buildSettings = {
492 | 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
493 | 				BUNDLE_LOADER = "$(TEST_HOST)";
494 | 				CODE_SIGN_STYLE = Automatic;
495 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
496 | 				INFOPLIST_FILE = ECTimelineViewExampleTests/Info.plist;
497 | 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
498 | 				LD_RUNPATH_SEARCH_PATHS = (
499 | 					"$(inherited)",
500 | 					"@executable_path/Frameworks",
501 | 					"@loader_path/Frameworks",
502 | 				);
503 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExampleTests;
504 | 				PRODUCT_NAME = "$(TARGET_NAME)";
505 | 				SWIFT_VERSION = 5.0;
506 | 				TARGETED_DEVICE_FAMILY = "1,2";
507 | 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/ECTimelineViewExample.app/ECTimelineViewExample";
508 | 			};
509 | 			name = Debug;
510 | 		};
511 | 		7CCE248F252A8B4C007557FE /* Release */ = {
512 | 			isa = XCBuildConfiguration;
513 | 			buildSettings = {
514 | 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
515 | 				BUNDLE_LOADER = "$(TEST_HOST)";
516 | 				CODE_SIGN_STYLE = Automatic;
517 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
518 | 				INFOPLIST_FILE = ECTimelineViewExampleTests/Info.plist;
519 | 				IPHONEOS_DEPLOYMENT_TARGET = 14.0;
520 | 				LD_RUNPATH_SEARCH_PATHS = (
521 | 					"$(inherited)",
522 | 					"@executable_path/Frameworks",
523 | 					"@loader_path/Frameworks",
524 | 				);
525 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExampleTests;
526 | 				PRODUCT_NAME = "$(TARGET_NAME)";
527 | 				SWIFT_VERSION = 5.0;
528 | 				TARGETED_DEVICE_FAMILY = "1,2";
529 | 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/ECTimelineViewExample.app/ECTimelineViewExample";
530 | 			};
531 | 			name = Release;
532 | 		};
533 | 		7CCE2491252A8B4C007557FE /* Debug */ = {
534 | 			isa = XCBuildConfiguration;
535 | 			buildSettings = {
536 | 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
537 | 				CODE_SIGN_STYLE = Automatic;
538 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
539 | 				INFOPLIST_FILE = ECTimelineViewExampleUITests/Info.plist;
540 | 				LD_RUNPATH_SEARCH_PATHS = (
541 | 					"$(inherited)",
542 | 					"@executable_path/Frameworks",
543 | 					"@loader_path/Frameworks",
544 | 				);
545 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExampleUITests;
546 | 				PRODUCT_NAME = "$(TARGET_NAME)";
547 | 				SWIFT_VERSION = 5.0;
548 | 				TARGETED_DEVICE_FAMILY = "1,2";
549 | 				TEST_TARGET_NAME = ECTimelineViewExample;
550 | 			};
551 | 			name = Debug;
552 | 		};
553 | 		7CCE2492252A8B4C007557FE /* Release */ = {
554 | 			isa = XCBuildConfiguration;
555 | 			buildSettings = {
556 | 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
557 | 				CODE_SIGN_STYLE = Automatic;
558 | 				DEVELOPMENT_TEAM = HP22MNWU5C;
559 | 				INFOPLIST_FILE = ECTimelineViewExampleUITests/Info.plist;
560 | 				LD_RUNPATH_SEARCH_PATHS = (
561 | 					"$(inherited)",
562 | 					"@executable_path/Frameworks",
563 | 					"@loader_path/Frameworks",
564 | 				);
565 | 				PRODUCT_BUNDLE_IDENTIFIER = com.evancooper.ECTimelineViewExampleUITests;
566 | 				PRODUCT_NAME = "$(TARGET_NAME)";
567 | 				SWIFT_VERSION = 5.0;
568 | 				TARGETED_DEVICE_FAMILY = "1,2";
569 | 				TEST_TARGET_NAME = ECTimelineViewExample;
570 | 			};
571 | 			name = Release;
572 | 		};
573 | /* End XCBuildConfiguration section */
574 | 
575 | /* Begin XCConfigurationList section */
576 | 		7CCE245B252A8B4B007557FE /* Build configuration list for PBXProject "ECTimelineViewExample" */ = {
577 | 			isa = XCConfigurationList;
578 | 			buildConfigurations = (
579 | 				7CCE2488252A8B4C007557FE /* Debug */,
580 | 				7CCE2489252A8B4C007557FE /* Release */,
581 | 			);
582 | 			defaultConfigurationIsVisible = 0;
583 | 			defaultConfigurationName = Release;
584 | 		};
585 | 		7CCE248A252A8B4C007557FE /* Build configuration list for PBXNativeTarget "ECTimelineViewExample" */ = {
586 | 			isa = XCConfigurationList;
587 | 			buildConfigurations = (
588 | 				7CCE248B252A8B4C007557FE /* Debug */,
589 | 				7CCE248C252A8B4C007557FE /* Release */,
590 | 			);
591 | 			defaultConfigurationIsVisible = 0;
592 | 			defaultConfigurationName = Release;
593 | 		};
594 | 		7CCE248D252A8B4C007557FE /* Build configuration list for PBXNativeTarget "ECTimelineViewExampleTests" */ = {
595 | 			isa = XCConfigurationList;
596 | 			buildConfigurations = (
597 | 				7CCE248E252A8B4C007557FE /* Debug */,
598 | 				7CCE248F252A8B4C007557FE /* Release */,
599 | 			);
600 | 			defaultConfigurationIsVisible = 0;
601 | 			defaultConfigurationName = Release;
602 | 		};
603 | 		7CCE2490252A8B4C007557FE /* Build configuration list for PBXNativeTarget "ECTimelineViewExampleUITests" */ = {
604 | 			isa = XCConfigurationList;
605 | 			buildConfigurations = (
606 | 				7CCE2491252A8B4C007557FE /* Debug */,
607 | 				7CCE2492252A8B4C007557FE /* Release */,
608 | 			);
609 | 			defaultConfigurationIsVisible = 0;
610 | 			defaultConfigurationName = Release;
611 | 		};
612 | /* End XCConfigurationList section */
613 | 
614 | /* Begin XCSwiftPackageProductDependency section */
615 | 		7CCBFF9D252AA4EA00EE9573 /* ECTimelineView */ = {
616 | 			isa = XCSwiftPackageProductDependency;
617 | 			productName = ECTimelineView;
618 | 		};
619 | /* End XCSwiftPackageProductDependency section */
620 | 	};
621 | 	rootObject = 7CCE2458252A8B4B007557FE /* Project object */;
622 | }
623 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
3 | <plist version="1.0">
4 | <dict>
5 | 	<key>IDEDidComputeMac32BitWarning</key>
6 | 	<true/>
7 | </dict>
8 | </plist>
9 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved:
--------------------------------------------------------------------------------
 1 | {
 2 |   "object": {
 3 |     "pins": [
 4 |       {
 5 |         "package": "ECUICollectionViewMultiDelegate",
 6 |         "repositoryURL": "https://github.com/EvanCooper9/ECUICollectionViewMultiDelegate",
 7 |         "state": {
 8 |           "branch": null,
 9 |           "revision": "12fc074a5438b56fba802add2a2191cf6c8eb8ff",
10 |           "version": "0.1.0"
11 |         }
12 |       }
13 |     ]
14 |   },
15 |   "version": 1
16 | }
17 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  ECTimelineViewExample
 4 | //
 5 | //  Created by Evan Cooper on 2020-10-04.
 6 | //
 7 | 
 8 | import UIKit
 9 | 
10 | @main
11 | class AppDelegate: UIResponder, UIApplicationDelegate {
12 | 
13 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
14 |         true
15 |     }
16 | 
17 |     // MARK: UISceneSession Lifecycle
18 | 
19 |     func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
20 |         UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
21 |     }
22 | }
23 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Assets.xcassets/AccentColor.colorset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "colors" : [
 3 |     {
 4 |       "idiom" : "universal"
 5 |     }
 6 |   ],
 7 |   "info" : {
 8 |     "author" : "xcode",
 9 |     "version" : 1
10 |   }
11 | }
12 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "scale" : "2x",
 6 |       "size" : "20x20"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "scale" : "3x",
11 |       "size" : "20x20"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "scale" : "2x",
16 |       "size" : "29x29"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "scale" : "3x",
21 |       "size" : "29x29"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "scale" : "2x",
26 |       "size" : "40x40"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "scale" : "3x",
31 |       "size" : "40x40"
32 |     },
33 |     {
34 |       "idiom" : "iphone",
35 |       "scale" : "2x",
36 |       "size" : "60x60"
37 |     },
38 |     {
39 |       "idiom" : "iphone",
40 |       "scale" : "3x",
41 |       "size" : "60x60"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "scale" : "1x",
46 |       "size" : "20x20"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "scale" : "2x",
51 |       "size" : "20x20"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "scale" : "1x",
56 |       "size" : "29x29"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "scale" : "2x",
61 |       "size" : "29x29"
62 |     },
63 |     {
64 |       "idiom" : "ipad",
65 |       "scale" : "1x",
66 |       "size" : "40x40"
67 |     },
68 |     {
69 |       "idiom" : "ipad",
70 |       "scale" : "2x",
71 |       "size" : "40x40"
72 |     },
73 |     {
74 |       "idiom" : "ipad",
75 |       "scale" : "1x",
76 |       "size" : "76x76"
77 |     },
78 |     {
79 |       "idiom" : "ipad",
80 |       "scale" : "2x",
81 |       "size" : "76x76"
82 |     },
83 |     {
84 |       "idiom" : "ipad",
85 |       "scale" : "2x",
86 |       "size" : "83.5x83.5"
87 |     },
88 |     {
89 |       "idiom" : "ios-marketing",
90 |       "scale" : "1x",
91 |       "size" : "1024x1024"
92 |     }
93 |   ],
94 |   "info" : {
95 |     "author" : "xcode",
96 |     "version" : 1
97 |   }
98 | }
99 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Assets.xcassets/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 |   "info" : {
3 |     "author" : "xcode",
4 |     "version" : 1
5 |   }
6 | }
7 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17156" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <device id="retina6_1" orientation="portrait" appearance="light"/>
 4 |     <dependencies>
 5 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17125"/>
 6 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 7 |         <capability name="System colors in document resources" minToolsVersion="11.0"/>
 8 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 9 |     </dependencies>
10 |     <scenes>
11 |         <!--View Controller-->
12 |         <scene sceneID="EHf-IW-A2E">
13 |             <objects>
14 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <subviews>
19 |                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="ECTimelineViewExample" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ttF-se-XN1">
20 |                                 <rect key="frame" x="114" y="437.5" width="186" height="21"/>
21 |                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
22 |                                 <nil key="textColor"/>
23 |                                 <nil key="highlightedColor"/>
24 |                             </label>
25 |                         </subviews>
26 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
27 |                         <color key="backgroundColor" systemColor="systemBackgroundColor"/>
28 |                         <constraints>
29 |                             <constraint firstItem="ttF-se-XN1" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="fDR-xA-QBp"/>
30 |                             <constraint firstItem="ttF-se-XN1" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="s35-Q9-0A0"/>
31 |                         </constraints>
32 |                     </view>
33 |                 </viewController>
34 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
35 |             </objects>
36 |             <point key="canvasLocation" x="53" y="375"/>
37 |         </scene>
38 |     </scenes>
39 |     <resources>
40 |         <systemColor name="systemBackgroundColor">
41 |             <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
42 |         </systemColor>
43 |     </resources>
44 | </document>
45 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17156" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
 3 |     <device id="retina6_1" orientation="portrait" appearance="light"/>
 4 |     <dependencies>
 5 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17125"/>
 6 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 7 |         <capability name="System colors in document resources" minToolsVersion="11.0"/>
 8 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 9 |     </dependencies>
10 |     <scenes>
11 |         <!--View Controller-->
12 |         <scene sceneID="tne-QT-ifu">
13 |             <objects>
14 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="ECTimelineViewExample" customModuleProvider="target" sceneMemberID="viewController">
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
19 |                         <color key="backgroundColor" systemColor="systemBackgroundColor"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="42" y="94"/>
25 |         </scene>
26 |     </scenes>
27 |     <resources>
28 |         <systemColor name="systemBackgroundColor">
29 |             <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
30 |         </systemColor>
31 |     </resources>
32 | </document>
33 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | 	<key>LSRequiresIPhoneOS</key>
22 | 	<true/>
23 | 	<key>UIApplicationSceneManifest</key>
24 | 	<dict>
25 | 		<key>UIApplicationSupportsMultipleScenes</key>
26 | 		<false/>
27 | 		<key>UISceneConfigurations</key>
28 | 		<dict>
29 | 			<key>UIWindowSceneSessionRoleApplication</key>
30 | 			<array>
31 | 				<dict>
32 | 					<key>UISceneConfigurationName</key>
33 | 					<string>Default Configuration</string>
34 | 					<key>UISceneDelegateClassName</key>
35 | 					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
36 | 					<key>UISceneStoryboardFile</key>
37 | 					<string>Main</string>
38 | 				</dict>
39 | 			</array>
40 | 		</dict>
41 | 	</dict>
42 | 	<key>UIApplicationSupportsIndirectInputEvents</key>
43 | 	<true/>
44 | 	<key>UILaunchStoryboardName</key>
45 | 	<string>LaunchScreen</string>
46 | 	<key>UIMainStoryboardFile</key>
47 | 	<string>Main</string>
48 | 	<key>UIRequiredDeviceCapabilities</key>
49 | 	<array>
50 | 		<string>armv7</string>
51 | 	</array>
52 | 	<key>UISupportedInterfaceOrientations</key>
53 | 	<array>
54 | 		<string>UIInterfaceOrientationPortrait</string>
55 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
56 | 		<string>UIInterfaceOrientationLandscapeRight</string>
57 | 	</array>
58 | 	<key>UISupportedInterfaceOrientations~ipad</key>
59 | 	<array>
60 | 		<string>UIInterfaceOrientationPortrait</string>
61 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
62 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
63 | 		<string>UIInterfaceOrientationLandscapeRight</string>
64 | 	</array>
65 | </dict>
66 | </plist>
67 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/SceneDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  SceneDelegate.swift
 3 | //  ECTimelineViewExample
 4 | //
 5 | //  Created by Evan Cooper on 2020-10-04.
 6 | //
 7 | 
 8 | import UIKit
 9 | 
10 | class SceneDelegate: UIResponder, UIWindowSceneDelegate {
11 | 
12 |     var window: UIWindow?
13 |     
14 |     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
15 |         guard let _ = (scene as? UIWindowScene) else { return }
16 |     }
17 | }
18 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExample/ViewController.swift:
--------------------------------------------------------------------------------
 1 | import ECTimelineView
 2 | import UIKit
 3 | 
 4 | struct DataModel {
 5 |     let index: Int
 6 |     let value: String
 7 | }
 8 | 
 9 | class ViewController: UIViewController {
10 | 
11 |     // MARK: - Private Properties
12 |     
13 |     private lazy var timelineView: ECTimelineView<DataModel, UICollectionViewCell> = {
14 |         let timelineView = ECTimelineView<DataModel, UICollectionViewCell>()
15 |         timelineView.timelineDataSource = self
16 |         timelineView.translatesAutoresizingMaskIntoConstraints = false
17 |         return timelineView
18 |     }()
19 |     
20 |     private var data = [Int: DataModel]()
21 |     
22 |     // MARK: - Lifecycle
23 |     
24 |     override func viewDidLoad() {
25 |         super.viewDidLoad()
26 |         
27 |         view.addSubview(timelineView)
28 |         NSLayoutConstraint.activate([
29 |             view.safeAreaLayoutGuide.leadingAnchor.constraint(equalTo: timelineView.leadingAnchor),
30 |             view.safeAreaLayoutGuide.trailingAnchor.constraint(equalTo: timelineView.trailingAnchor),
31 |             view.safeAreaLayoutGuide.topAnchor.constraint(equalTo: timelineView.topAnchor),
32 |             view.safeAreaLayoutGuide.bottomAnchor.constraint(equalTo: timelineView.bottomAnchor)
33 |         ])
34 |     }
35 | }
36 | 
37 | // MARK: - ECTimelineViewDataSource
38 | 
39 | extension ViewController: ECTimelineViewDataSource {
40 |     
41 |     func timelineView<T, U: UICollectionViewCell>(_ timelineView: ECTimelineView<T, U>, dataFor index: Int, asyncClosure: @escaping (T?) -> Void) -> T? {
42 |         DispatchQueue.global(qos: .background).asyncAfter(deadline: .now() + 2) {
43 |             asyncClosure(DataModel(index: index, value: "Async \(index)") as? T)
44 |         }
45 |         
46 |         return DataModel(index: index, value: "\(index)") as? T
47 |     }
48 | 
49 |     func configure<T, U>(_ cell: U, withData data: T?) where U : UICollectionViewCell {
50 |         guard let data = data as? DataModel else { return }
51 |         cell.subviews.forEach { $0.removeFromSuperview() }
52 |         let label = UILabel()
53 |         label.textAlignment = .center
54 |         label.textColor = .white
55 |         label.text = data.value
56 |         label.translatesAutoresizingMaskIntoConstraints = false
57 |         cell.addSubview(label)
58 |         cell.backgroundColor = data.index % 2 == 0 ? .red : .blue
59 |         NSLayoutConstraint.activate([
60 |             cell.centerYAnchor.constraint(equalTo: label.centerYAnchor),
61 |             cell.centerXAnchor.constraint(equalTo: label.centerXAnchor)
62 |         ])
63 |     }
64 | }
65 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExampleTests/ECTimelineViewExampleTests.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ECTimelineViewExampleTests.swift
 3 | //  ECTimelineViewExampleTests
 4 | //
 5 | //  Created by Evan Cooper on 2020-10-04.
 6 | //
 7 | 
 8 | import XCTest
 9 | @testable import ECTimelineViewExample
10 | 
11 | class ECTimelineViewExampleTests: XCTestCase {
12 | 
13 |     override func setUpWithError() throws {
14 |         // Put setup code here. This method is called before the invocation of each test method in the class.
15 |     }
16 | 
17 |     override func tearDownWithError() throws {
18 |         // Put teardown code here. This method is called after the invocation of each test method in the class.
19 |     }
20 | 
21 |     func testExample() throws {
22 |         // This is an example of a functional test case.
23 |         // Use XCTAssert and related functions to verify your tests produce the correct results.
24 |     }
25 | 
26 |     func testPerformanceExample() throws {
27 |         // This is an example of a performance test case.
28 |         self.measure {
29 |             // Put the code you want to measure the time of here.
30 |         }
31 |     }
32 | 
33 | }
34 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExampleTests/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExampleUITests/ECTimelineViewExampleUITests.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ECTimelineViewExampleUITests.swift
 3 | //  ECTimelineViewExampleUITests
 4 | //
 5 | //  Created by Evan Cooper on 2020-10-04.
 6 | //
 7 | 
 8 | import XCTest
 9 | 
10 | class ECTimelineViewExampleUITests: XCTestCase {
11 | 
12 |     override func setUpWithError() throws {
13 |         // Put setup code here. This method is called before the invocation of each test method in the class.
14 | 
15 |         // In UI tests it is usually best to stop immediately when a failure occurs.
16 |         continueAfterFailure = false
17 | 
18 |         // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this.
19 |     }
20 | 
21 |     override func tearDownWithError() throws {
22 |         // Put teardown code here. This method is called after the invocation of each test method in the class.
23 |     }
24 | 
25 |     func testExample() throws {
26 |         // UI tests must launch the application that they test.
27 |         let app = XCUIApplication()
28 |         app.launch()
29 | 
30 |         // Use recording to get started writing UI tests.
31 |         // Use XCTAssert and related functions to verify your tests produce the correct results.
32 |     }
33 | 
34 |     func testLaunchPerformance() throws {
35 |         if #available(macOS 10.15, iOS 13.0, tvOS 13.0, *) {
36 |             // This measures how long it takes to launch your application.
37 |             measure(metrics: [XCTApplicationLaunchMetric()]) {
38 |                 XCUIApplication().launch()
39 |             }
40 |         }
41 |     }
42 | }
43 | 


--------------------------------------------------------------------------------
/Example/ECTimelineViewExampleUITests/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/Package.resolved:
--------------------------------------------------------------------------------
 1 | {
 2 |   "object": {
 3 |     "pins": [
 4 |       {
 5 |         "package": "ECUICollectionViewMultiDelegate",
 6 |         "repositoryURL": "https://github.com/EvanCooper9/ECUICollectionViewMultiDelegate",
 7 |         "state": {
 8 |           "branch": null,
 9 |           "revision": "12fc074a5438b56fba802add2a2191cf6c8eb8ff",
10 |           "version": "0.1.0"
11 |         }
12 |       }
13 |     ]
14 |   },
15 |   "version": 1
16 | }
17 | 


--------------------------------------------------------------------------------
/Package.swift:
--------------------------------------------------------------------------------
 1 | // swift-tools-version:5.3
 2 | // The swift-tools-version declares the minimum version of Swift required to build this package.
 3 | 
 4 | import PackageDescription
 5 | 
 6 | let package = Package(
 7 |     name: "ECTimelineView",
 8 |     products: [
 9 |         .library(
10 |             name: "ECTimelineView",
11 |             targets: ["ECTimelineView"]),
12 |     ],
13 |     dependencies: [
14 |         .package(url: "https://github.com/EvanCooper9/ECUICollectionViewMultiDelegate", from: "0.1.0")
15 |     ],
16 |     targets: [
17 |         .target(
18 |             name: "ECTimelineView",
19 |             dependencies: [
20 |                 .init(stringLiteral: "ECUICollectionViewMultiDelegate")
21 |             ],
22 |             path: "Sources"
23 |         )
24 |     ]
25 | )
26 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # ECTimelineView
 2 | 
 3 | An horizontal or vertical infinitely scrolling `UICollectionView` implementation. Loads data synchrounously and asynchronously.
 4 | 
 5 | ## Installation
 6 | ### Swift Package Manager
 7 | 
 8 | ```swift
 9 | .package(url: "https://github.com/EvanCooper9/ECTimelineView", from: "1.0.0")
10 | ```
11 | 
12 | ### Dependencies
13 | - [ECUICollectionViewMultiDelegate](https://github.com/EvanCooper9/ECUICollectionViewMultiDelegate)
14 | 
15 | ## Usage
16 | > Note: See inline documentation for more details
17 | 
18 | ### Data Source
19 | Implement `ECTimelineViewDataSource`, and set the `timelineDataSource` property.
20 | 
21 | ```swift
22 | // MARK: ECTimelineViewDataSource protocol
23 | 
24 | // Asks for cell data that corresponds to the specified index
25 | func timelineView<T, U>(_ timelineView: ECTimelineView<T, U>, dataFor index: Int, asyncClosure: @escaping (_ data: T?) -> Void) -> T?
26 |     
27 | // Configures the cell with the designated data
28 | func configure<T, U: UICollectionViewCell>(_ cell: U, withData data: T?)
29 | ```
30 | 


--------------------------------------------------------------------------------
/Sources/ECTimelineView.swift:
--------------------------------------------------------------------------------
  1 | import ECUICollectionViewMultiDelegate
  2 | import UIKit
  3 | 
  4 | public final class ECTimelineView<T, U: UICollectionViewCell>: UICollectionView, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
  5 | 
  6 |     // MARK: - Public properties
  7 |     
  8 |     /// Number of screens on either side of the visible cells to prefetch data for
  9 |     public var bufferScreens = 3 {
 10 |         didSet { reloadData() }
 11 |     }
 12 |     
 13 |     /// Number of cells visible on the screen
 14 |     public var visibleCellCount = 5 {
 15 |         didSet { reloadData() }
 16 |     }
 17 |     
 18 |     /// The direction dictates the axis fo scroll
 19 |     public var scrollDirection = ScrollDirection.vertical {
 20 |         didSet { collectionViewLayout = layout }
 21 |     }
 22 |     
 23 |     /// Where to start the visible content, considering the buffer content that is loaded
 24 |     public var startPosition: StartPosition = .middle
 25 |     
 26 |     /// Whether or not to re-ask the data source for new data when loading a cell who's data had been previously fetched
 27 |     public var refetchData = false
 28 |     
 29 |     /// Spacing between each cell
 30 |     public var cellSpacing: CGFloat = 0
 31 | 
 32 |     /// The data source
 33 |     public weak var timelineDataSource: ECTimelineViewDataSource? {
 34 |         didSet {
 35 |             data.removeAll()
 36 |             dataOffset = timelineDataSource?.lowerBound ?? 0
 37 |             displayedInitialCells = false
 38 |             fetchData(for: dataOffset...(pages * visibleCellCount) + dataOffset - 1)
 39 |             reloadData()
 40 |         }
 41 |     }
 42 |         
 43 |     // MARK: - Overrides
 44 |     
 45 |     /// Do not set this property. Use `timelineDataSource` instead
 46 |     public override var dataSource: UICollectionViewDataSource? {
 47 |         didSet {
 48 |             if !(dataSource is Self) { preconditionFailure("Do not set the dataSource property. Use `timelineDataSource` instead") }
 49 |         }
 50 |     }
 51 |     
 52 |     public override var delegate: UICollectionViewDelegate? {
 53 |         didSet {
 54 |             guard let delegate = delegate, !delegate.isEqual(multiDelegate) else { return }
 55 |             multiDelegate.add(delegate)
 56 |             self.delegate = multiDelegate
 57 |         }
 58 |     }
 59 | 
 60 |     // MARK: - Private properties
 61 |     
 62 |     private let multiDelegate = ECUICollectionViewMultiDelegate()
 63 |     private var displayedInitialCells = false
 64 |     private var pages: Int { (bufferScreens * 2) + 1 }
 65 |     private var bufferCells: Int { bufferScreens * visibleCellCount }
 66 |     private var cellCount: Int { visibleCellCount + (bufferCells * 2) }
 67 |     private var horizontal: Bool { scrollDirection == .horizontal }
 68 |     private var vertical: Bool { scrollDirection == .vertical }
 69 | 
 70 |     private let dataQueue = DispatchQueue(label: "com.evancooper.ectimelineview.data-queue")
 71 |     private var data = [Int: T]()
 72 |     private var dataOffset = 0
 73 |     
 74 |     private var areBoundsValid: Bool {
 75 |         guard let lowerBound = timelineDataSource?.lowerBound, let upperBound = timelineDataSource?.upperBound else { return true }
 76 |         return (lowerBound..<upperBound).count >= cellCount
 77 |     }
 78 |     
 79 |     private var cellSize: CGSize {
 80 |         let width = horizontal ? frame.width / CGFloat(visibleCellCount) : frame.width
 81 |         let height = horizontal ? frame.height : frame.height / CGFloat(visibleCellCount)
 82 |         return CGSize(width: width, height: height)
 83 |     }
 84 |     
 85 |     private var currentPosition: CGFloat {
 86 |         let offset = horizontal ? contentOffset.x : contentOffset.y
 87 |         return offset + (horizontal ? bounds.width : bounds.height) / 2
 88 |     }
 89 |     
 90 |     private var layout: UICollectionViewFlowLayout {
 91 |         let layout = UICollectionViewFlowLayout()
 92 |         layout.scrollDirection = scrollDirection
 93 |         return layout
 94 |     }
 95 | 
 96 |     private var loadDirection: LoadDirection {
 97 |         let contentMiddle = (horizontal ? contentSize.width : contentSize.height) / 2
 98 |         return (currentPosition > contentMiddle) ? .positive : .negative
 99 |     }
100 | 
101 |     private var visibleIndicies: [Int] {
102 |         visibleCells
103 |             .compactMap { indexPath(for: $0)?.row }
104 |             .map { $0 + dataOffset }
105 |     }
106 | 
107 |     // MARK: - Lifecycle
108 | 
109 |     public init(frame: CGRect = .zero) {
110 |         super.init(frame: frame, collectionViewLayout: .init())
111 |         commonInit()
112 |     }
113 | 
114 |     required init?(coder aDecoder: NSCoder) {
115 |         super.init(coder: aDecoder)
116 |         commonInit()
117 |     }
118 |     
119 |     private func commonInit() {
120 |         collectionViewLayout = layout
121 |         showsVerticalScrollIndicator = vertical
122 |         showsHorizontalScrollIndicator = horizontal
123 |         delegate = self
124 |         dataSource = self
125 |         multiDelegate.reductionDelegate = self
126 |         register(cellType: U.self)
127 |         dataOffset = bufferScreens * visibleCellCount
128 |     }
129 |     
130 |     // MARK: - Public Methods
131 |     
132 |     public func add(_ delegate: UICollectionViewDelegate) {
133 |         multiDelegate.add(delegate)
134 |     }
135 |     
136 |     public func remove(_ delegate: UICollectionViewDelegate) {
137 |         multiDelegate.remove(delegate)
138 |     }
139 | 
140 |     public func refresh(dataAt index: Int) {
141 |         data[index] = timelineDataSource?
142 |             .timelineView(self, dataFor: index) { asyncData in
143 |                 self.data[index] = asyncData
144 |             }
145 |     }
146 | 
147 |     // MARK: - Private Methods
148 | 
149 |     private func adjustContentOffset() {
150 |         guard let lowestVisibleIndex = visibleIndicies.min() else { return }
151 | 
152 |         let oldDataOffset = dataOffset
153 |         dataOffset = lowestVisibleIndex - bufferCells
154 |         
155 |         if areBoundsValid {
156 |             if let lowerBound = timelineDataSource?.lowerBound, lowerBound > dataOffset {
157 |                 dataOffset = lowerBound
158 |             }
159 |             
160 |             if let upperBound = timelineDataSource?.upperBound, upperBound < dataOffset + cellCount {
161 |                 dataOffset = upperBound - cellCount
162 |             }
163 |         }
164 | 
165 |         let size = horizontal ? cellSize.width : cellSize.height
166 |         let scrollAmount = (CGFloat(dataOffset - oldDataOffset) * size)
167 |         let startOfContentOffset = horizontal ? contentOffset.x : contentOffset.y
168 |         let scrollTo = startOfContentOffset - scrollAmount
169 |         
170 |         let pointX = horizontal ? scrollTo : 0
171 |         let pointY = horizontal ? 0 : scrollTo
172 |         setContentOffset(.init(x: pointX, y: pointY), animated: false)
173 |     }
174 |     
175 |     private func fetchData() {
176 |         let pointToAddData = loadDirection.isPositive ? dataOffset + cellCount : dataOffset - bufferCells - 1
177 |         
178 |         var min = pointToAddData
179 |         var max = pointToAddData + (loadDirection.isPositive ? cellCount : bufferCells)
180 |         
181 |         if areBoundsValid {
182 |             if let lowerBound = timelineDataSource?.lowerBound, lowerBound < min {
183 |                 min = lowerBound
184 |             }
185 |             
186 |             if let upperBound = timelineDataSource?.upperBound, upperBound > max {
187 |                 max = upperBound
188 |             }
189 |         }
190 |         
191 |         fetchData(for: min...max)
192 |     }
193 | 
194 |     private func fetchData(for range: ClosedRange<Int>) {
195 |         range
196 |             .filter { refetchData || !data.keys.contains($0) }
197 |             .forEach { index in
198 |                 let dataFromDataSource = timelineDataSource?
199 |                     .timelineView(self, dataFor: index) { [weak self] asyncData in
200 |                         guard let self = self else { return }
201 |                         self.dataQueue.sync { self.data[index] = asyncData }
202 |                         DispatchQueue.main.async {
203 |                             guard self.visibleIndicies.contains(index) else { return }
204 |                             let indexPath = IndexPath(row: index - self.dataOffset, section: 0)
205 |                             self.reloadItems(at: [indexPath])
206 |                         }
207 |                     }
208 |                 dataQueue.sync { data[index] = dataFromDataSource }
209 |             }
210 |     }
211 | 
212 |     // MARK: - UICollectionViewDataSource
213 | 
214 |     public func numberOfSections(in collectionView: UICollectionView) -> Int {
215 |         1
216 |     }
217 | 
218 |     public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
219 |         visibleCellCount * pages
220 |     }
221 | 
222 |     public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
223 |         let adjustedIndex = indexPath.row + dataOffset
224 |         let cell = dequeueReusableCell(withType: U.self, for: indexPath)
225 |         timelineDataSource?.configure(cell, withData: data[adjustedIndex])
226 |         return cell
227 |     }
228 | 
229 |     // MARK: - UICollectionViewDelegate
230 | 
231 |     public func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
232 |         guard !displayedInitialCells else { return }
233 |         displayedInitialCells.toggle()
234 |         let startPosition: Int = {
235 |             switch self.startPosition {
236 |             case .beginning:
237 |                 return 0
238 |             case .middle:
239 |                 return bufferCells
240 |             case .end:
241 |                 return cellCount - visibleCellCount
242 |             }
243 |         }()
244 |         scrollToItem(at: .init(row: startPosition, section: 0), at: .top, animated: false)
245 |     }
246 | 
247 |     // MARK: - UICollectionViewDelegateFlowLayout
248 | 
249 |     public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
250 |         cellSpacing
251 |     }
252 | 
253 |     public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
254 |         cellSize
255 |     }
256 | 
257 |     // MARK: - UIScrollViewDelegate
258 | 
259 |     public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
260 |         fetchData()
261 |         adjustContentOffset()
262 |         reloadData()
263 |     }
264 | }
265 | 
266 | 
267 | extension ECTimelineView: ECReductionDelegate {
268 |     public func reduce<ReductionType>(_ first: ReductionType, _ second: ReductionType, selector: Selector) -> ReductionType {
269 |         second
270 |     }
271 | }
272 | 


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/Sources/ECTimelineViewDataSource.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | public protocol ECTimelineViewDataSource: AnyObject {
 4 |     
 5 |     /// The lower bound (inclusive). The view will not scroll past this index or request data from the data source
 6 |     var lowerBound: Int? { get }
 7 |     
 8 |     
 9 |     /// The upper bound (exclusive). The view will not scroll past this index or request data from the data source
10 |     var upperBound: Int? { get }
11 |     
12 |     /// Asks for cell data that corresponds to the specified index
13 |     /// - Parameters:
14 |     ///   - timelineCollectionView: the opject requesting the data
15 |     ///   - index: the index of the data being stored in relation to all the other data
16 |     ///   - asyncClosure: a closure to return the requested data in an asynchronous fashion
17 |     /// - Important: Data returned through asyncClosure will override any data previously returned
18 |     func timelineView<T, U>(_ timelineView: ECTimelineView<T, U>, dataFor index: Int, asyncClosure: @escaping (_ data: T?) -> Void) -> T?
19 |     
20 |     /// Configures the cell with the designated data
21 |     /// - Parameters:
22 |     ///   - cell: the cell to configure
23 |     ///   - data: the data that should be used to configure the cell
24 |     func configure<T, U: UICollectionViewCell>(_ cell: U, withData data: T?)
25 | }
26 | 
27 | public extension ECTimelineViewDataSource {
28 |     var lowerBound: Int? { nil }
29 |     var upperBound: Int? { nil }
30 | }
31 | 


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/Sources/Enums/LoadDirection.swift:
--------------------------------------------------------------------------------
 1 | import Foundation
 2 | 
 3 | internal enum LoadDirection {
 4 |     case positive, negative
 5 | }
 6 | 
 7 | extension LoadDirection {
 8 |     var isPositive: Bool { self == .positive }
 9 |     var isNegative: Bool { self == .negative }
10 | }
11 | 


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/Sources/Enums/StartPosition.swift:
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1 | public enum StartPosition {
2 |     case beginning
3 |     case middle
4 |     case end
5 | }
6 | 


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/Sources/Extensions/UICollectionView+Extensions.swift:
--------------------------------------------------------------------------------
 1 | import UIKit
 2 | 
 3 | extension UICollectionView {
 4 |     func dequeueReusableCell<T: UICollectionViewCell>(withType type: T.Type, for indexPath: IndexPath) -> T {
 5 |         dequeueReusableCell(withReuseIdentifier: String(describing: T.self), for: indexPath) as! T
 6 |     }
 7 | 
 8 |     func register<T: UICollectionViewCell>(cellType type: T.Type) {
 9 |         register(T.self, forCellWithReuseIdentifier: String(describing: T.self))
10 |     }
11 | }
12 | 


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/Tests/ECTimelineViewTests.swift:
--------------------------------------------------------------------------------
1 | import XCTest
2 | @testable import ECTimelineView
3 | 
4 | final class ECTimelineViewTests: XCTestCase {
5 |     
6 | }
7 | 


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/Tests/XCTestManifests.swift:
--------------------------------------------------------------------------------
 1 | import XCTest
 2 | 
 3 | #if !canImport(ObjectiveC)
 4 | public func allTests() -> [XCTestCaseEntry] {
 5 |     return [
 6 |         testCase(ECTimelineViewTests.allTests),
 7 |     ]
 8 | }
 9 | #endif
10 | 


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