├── .gitignore
├── DLImageLoader Demo
    ├── DLImageLoader Demo.xcodeproj
    │   └── project.pbxproj
    ├── DLImageLoader Demo
    │   ├── AppDelegate.swift
    │   ├── Assets.xcassets
    │   │   └── AppIcon.appiconset
    │   │   │   └── Contents.json
    │   ├── Base.lproj
    │   │   ├── LaunchScreen.storyboard
    │   │   └── Main.storyboard
    │   ├── Info.plist
    │   └── ViewController.swift
    ├── Podfile
    └── Podfile.lock
├── DLImageLoader.podspec
├── DLImageLoader
    ├── CacheManager.swift
    ├── DLImageLoader.swift
    ├── Strategies.swift
    └── Transformation.swift
├── LICENSE
├── README.md
└── dlil.png


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Xcode
 2 | .DS_Store
 3 | build/
 4 | *.pbxuser
 5 | !default.pbxuser
 6 | *.mode1v3
 7 | !default.mode1v3
 8 | *.mode2v3
 9 | !default.mode2v3
10 | *.perspectivev3
11 | !default.perspectivev3
12 | *.xcworkspace
13 | !default.xcworkspace
14 | xcuserdata
15 | profile
16 | *.moved-aside
17 | DerivedData
18 | .idea/
19 | 


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380 | 			defaultConfigurationName = Release;
381 | 		};
382 | 		D80956661BA8B5D600DED40C /* Build configuration list for PBXNativeTarget "DLImageLoader Demo" */ = {
383 | 			isa = XCConfigurationList;
384 | 			buildConfigurations = (
385 | 				D80956671BA8B5D600DED40C /* Debug */,
386 | 				D80956681BA8B5D600DED40C /* Release */,
387 | 			);
388 | 			defaultConfigurationIsVisible = 0;
389 | 			defaultConfigurationName = Release;
390 | 		};
391 | /* End XCConfigurationList section */
392 | 	};
393 | 	rootObject = D809564C1BA8B5D600DED40C /* Project object */;
394 | }
395 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  DLImageLoader Demo
 4 | //
 5 | //  Created by Andrew Lunevich on 9/15/15.
 6 | //  Copyright © 2015 Andrew Lunevich. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 |     func application(_ application: UIApplication,
17 |                      didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
18 |         // Override point for customization after application launch.
19 | 
20 |         return true
21 |     }
22 | }
23 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "ipad",
35 |       "size" : "29x29",
36 |       "scale" : "1x"
37 |     },
38 |     {
39 |       "idiom" : "ipad",
40 |       "size" : "29x29",
41 |       "scale" : "2x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "40x40",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "40x40",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "76x76",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "76x76",
61 |       "scale" : "2x"
62 |     }
63 |   ],
64 |   "info" : {
65 |     "version" : 1,
66 |     "author" : "xcode"
67 |   }
68 | }


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/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="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="xLf-A9-Hnf">
 3 |     <device id="retina6_1" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <deployment identifier="iOS"/>
 8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
 9 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
10 |     </dependencies>
11 |     <scenes>
12 |         <!--Navigation Controller-->
13 |         <scene sceneID="pGL-ko-HuC">
14 |             <objects>
15 |                 <navigationController id="xLf-A9-Hnf" sceneMemberID="viewController">
16 |                     <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="B3P-xo-fRo">
17 |                         <rect key="frame" x="0.0" y="44" width="414" height="44"/>
18 |                         <autoresizingMask key="autoresizingMask"/>
19 |                     </navigationBar>
20 |                     <connections>
21 |                         <segue destination="BYZ-38-t0r" kind="relationship" relationship="rootViewController" id="uti-17-gkL"/>
22 |                     </connections>
23 |                 </navigationController>
24 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="gLf-Eb-tmX" userLabel="First Responder" sceneMemberID="firstResponder"/>
25 |             </objects>
26 |             <point key="canvasLocation" x="-833" y="21"/>
27 |         </scene>
28 |         <!--View Controller-->
29 |         <scene sceneID="tne-QT-ifu">
30 |             <objects>
31 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="DLImageLoader_Demo" customModuleProvider="target" sceneMemberID="viewController">
32 |                     <layoutGuides>
33 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
34 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
35 |                     </layoutGuides>
36 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
37 |                         <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
38 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
39 |                         <subviews>
40 |                             <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="L6B-MG-YPJ">
41 |                                 <rect key="frame" x="147" y="388" width="120" height="120"/>
42 |                                 <constraints>
43 |                                     <constraint firstAttribute="width" constant="120" id="7D9-UQ-xwd"/>
44 |                                     <constraint firstAttribute="height" constant="120" id="abq-XO-NI2"/>
45 |                                 </constraints>
46 |                             </imageView>
47 |                         </subviews>
48 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
49 |                         <constraints>
50 |                             <constraint firstItem="L6B-MG-YPJ" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="NFh-1z-hPw"/>
51 |                             <constraint firstItem="L6B-MG-YPJ" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="VTV-dN-Yah"/>
52 |                         </constraints>
53 |                     </view>
54 |                     <navigationItem key="navigationItem" id="bgC-BW-aDk">
55 |                         <rightBarButtonItems>
56 |                             <barButtonItem systemItem="refresh" id="OMZ-4q-DE2">
57 |                                 <connections>
58 |                                     <action selector="refreshDidPress:" destination="BYZ-38-t0r" id="qHl-kl-aLv"/>
59 |                                 </connections>
60 |                             </barButtonItem>
61 |                             <barButtonItem title="Clear Cache" id="G7L-6H-wUj">
62 |                                 <connections>
63 |                                     <action selector="clearDidPress:" destination="BYZ-38-t0r" id="ISG-Fl-Jgi"/>
64 |                                 </connections>
65 |                             </barButtonItem>
66 |                         </rightBarButtonItems>
67 |                     </navigationItem>
68 |                     <connections>
69 |                         <outlet property="imageView" destination="L6B-MG-YPJ" id="Kyx-oB-Dso"/>
70 |                     </connections>
71 |                 </viewController>
72 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
73 |             </objects>
74 |         </scene>
75 |     </scenes>
76 | </document>
77 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/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>en</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>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | 	<key>NSAppTransportSecurity</key>
40 | 	<dict>
41 | 		<key>NSAllowsArbitraryLoads</key>
42 | 		<true/>
43 | 	</dict>
44 | 	<key>UISupportedInterfaceOrientations~ipad</key>
45 | 	<array>
46 | 		<string>UIInterfaceOrientationPortrait</string>
47 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
48 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
49 | 		<string>UIInterfaceOrientationLandscapeRight</string>
50 | 	</array>
51 | </dict>
52 | </plist>
53 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/DLImageLoader Demo/ViewController.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.swift
 3 | //  DLImageLoader Demo
 4 | //
 5 | //  Created by Andrew Lunevich on 9/15/15.
 6 | //  Copyright © 2015 Andrew Lunevich. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | import DLImageLoader
11 | 
12 | class ViewController: UIViewController {
13 | 
14 |     @IBOutlet weak var imageView: UIImageView!
15 | 
16 |     private var task: URLSessionDataTask?
17 | 
18 |     deinit {
19 |         task?.cancel()
20 |     }
21 | 
22 |     override func viewDidLoad() {
23 |         super.viewDidLoad()
24 | 
25 |         refreshDidPress(self)
26 |     }
27 | 
28 |     @IBAction func clearDidPress(_ sender: Any) {
29 |         DLImageLoader.shared.clearCache()
30 |     }
31 | 
32 |     @IBAction func refreshDidPress(_ sender: Any) {
33 |         let url = URL(string: "https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/Swift_logo.svg/2000px-Swift_logo.svg.png")
34 | 
35 |         task = DLImageLoader.shared.load(url, into: imageView)
36 |     }
37 | }
38 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/Podfile:
--------------------------------------------------------------------------------
1 | source 'https://github.com/CocoaPods/Specs.git'
2 | use_frameworks!
3 | 
4 | target "DLImageLoader Demo" do
5 |   platform :ios, '13.0'
6 |   pod "DLImageLoader", :path => "../"
7 | end
8 | 


--------------------------------------------------------------------------------
/DLImageLoader Demo/Podfile.lock:
--------------------------------------------------------------------------------
 1 | PODS:
 2 |   - DLImageLoader (4.2.0)
 3 | 
 4 | DEPENDENCIES:
 5 |   - DLImageLoader (from `../`)
 6 | 
 7 | EXTERNAL SOURCES:
 8 |   DLImageLoader:
 9 |     :path: "../"
10 | 
11 | SPEC CHECKSUMS:
12 |   DLImageLoader: 482a35d19dabeea7fb882cbc7c303ac168f7aa93
13 | 
14 | PODFILE CHECKSUM: 88c9b4f5f65bc0f4b6e86a2837b957d0ca671840
15 | 
16 | COCOAPODS: 1.12.0
17 | 


--------------------------------------------------------------------------------
/DLImageLoader.podspec:
--------------------------------------------------------------------------------
 1 | Pod::Spec.new do |s|
 2 |   s.name         = 'DLImageLoader'
 3 |   s.version      = '4.2.1'
 4 |   s.summary      = 'DLImageLoader is a reusable instrument for asynchronous image loading and caching.'
 5 |   s.description  = <<-DESC
 6 |                     DLImageLoader for iOS. 
 7 |                     The library is a reusable instrument for asynchronous image loading, caching and displaying.
 8 |                    DESC
 9 |   s.homepage     = 'https://github.com/AndreyLunevich/DLImageLoader-iOS'
10 |   s.license      = { :type => 'Apache License, Version 2.0', :file => 'LICENSE' }
11 |   s.author       = { 'Andrew Lunevich' => 'andrey.lunevich@gmail.com' }
12 |   s.platform     = :ios
13 |   s.source       = { :git => 'https://github.com/AndreyLunevich/DLImageLoader-iOS.git', :tag => s.version.to_s }
14 |   s.source_files = 'DLImageLoader', 'DLImageLoader/**/*.swift'
15 |   
16 |   s.ios.deployment_target = '13.0'
17 | 
18 |   s.swift_version = '5.8'
19 | end


--------------------------------------------------------------------------------
/DLImageLoader/CacheManager.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  CacheManager.swift
  3 | //
  4 | //  Created by Andrey Lunevich
  5 | //  Copyright © 2015 Andrey Lunevich. All rights reserved.
  6 | 
  7 | //  Licensed under the Apache License, Version 2.0 (the "License");
  8 | //  you may not use this file except in compliance with the License.
  9 | //  You may obtain a copy of the License at
 10 | 
 11 | //  http://www.apache.org/licenses/LICENSE-2.0
 12 | 
 13 | //  Unless required by applicable law or agreed to in writing, software
 14 | //  distributed under the License is distributed on an "AS IS" BASIS,
 15 | //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 16 | //  See the License for the specific language governing permissions and
 17 | //  limitations under the License.
 18 | 
 19 | import UIKit
 20 | 
 21 | public final class CacheManager {
 22 | 
 23 |     public class var cacheDirectoryPath: String {
 24 |         let path = NSSearchPathForDirectoriesInDomains(.cachesDirectory, .userDomainMask, true)[0] as NSString
 25 | 
 26 |         return path.appendingPathComponent("dlil-cache")
 27 |     }
 28 | 
 29 |     public enum Storage {
 30 |         case memory
 31 |         case disk(path: String)
 32 |         case all(diskPath: String)
 33 |     }
 34 | 
 35 |     private let storage: Storage
 36 |     private let cache = NSCache<NSString, UIImage>()
 37 | 
 38 |     public init(storage: Storage = .all(diskPath: cacheDirectoryPath)) throws {
 39 |         self.storage = storage
 40 | 
 41 |         try setupStorage(storage)
 42 |     }
 43 | 
 44 |     /**
 45 |      Get the image from the cache by the key (image url).
 46 |      At first will try to get image from memory cache
 47 |      If image will not found, will try to get image from disk cache
 48 |      - parameter key: Url of image that using as cache key.
 49 |      */
 50 |     internal func image(forKey key: String, storage: Storage? = nil) throws -> UIImage? {
 51 |         let storage = storage ?? self.storage
 52 | 
 53 |         try setupStorage(storage)
 54 | 
 55 |         switch storage {
 56 |         case .memory:
 57 |             return cache.object(forKey: key as NSString)
 58 | 
 59 |         case .disk(let path):
 60 |             return UIImage(contentsOfFile: imagePath(base: path, key: key))
 61 | 
 62 |         case .all(let diskPath):
 63 |             var image = cache.object(forKey: key as NSString)
 64 | 
 65 |             if image == nil {
 66 |                 image = UIImage(contentsOfFile: imagePath(base: diskPath, key: key))
 67 |             }
 68 | 
 69 |             return image
 70 |         }
 71 |     }
 72 | 
 73 |     /**
 74 |      Save the image in the cache for the key (image url).
 75 |      - parameter image: UIImage to save in cache.
 76 |      - parameter key: Url of image that using as cache key
 77 |      */
 78 |     internal func saveImage(_ image: UIImage, forKey key: String, storage: Storage? = nil) throws {
 79 |         let storage = storage ?? self.storage
 80 | 
 81 |         try setupStorage(storage)
 82 | 
 83 |         DispatchQueue.global(qos: .background).async {
 84 |             switch storage {
 85 |             case .memory:
 86 |                 self.cache.setObject(image, forKey: key as NSString)
 87 | 
 88 |             case .disk(let path):
 89 |                 try? self.saveImage(image, byPath: self.imagePath(base: path, key: key))
 90 | 
 91 |             case .all(let diskPath):
 92 |                 self.cache.setObject(image, forKey: key as NSString)
 93 | 
 94 |                 try? self.saveImage(image, byPath: self.imagePath(base: diskPath, key: key))
 95 |             }
 96 |         }
 97 |     }
 98 | 
 99 |     /**
100 |      Clear memory and disk cache
101 |      */
102 |     internal func clear(_ completion: ((_ error: Error?) -> Void)? = nil) {
103 |         cache.removeAllObjects()
104 | 
105 |         DispatchQueue.global(qos: .background).async {
106 |             var error: Error?
107 | 
108 |             switch self.storage {
109 |             case .memory:
110 |                 break
111 | 
112 |             case .disk(let path), .all(let path):
113 |                 let fileManager = FileManager.default
114 | 
115 |                 do {
116 |                     let files = try fileManager.contentsOfDirectory(atPath: path)
117 |                     for file in files {
118 |                         try fileManager.removeItem(atPath: self.imagePath(base: path, key: file))
119 |                     }
120 |                 } catch let err {
121 |                     error = err
122 |                 }
123 |             }
124 | 
125 |             DispatchQueue.main.async {
126 |                 completion?(error)
127 |             }
128 |         }
129 |     }
130 | 
131 |     // MARK: - private methods
132 | 
133 |     private func setupStorage(_ storage: Storage) throws {
134 |         switch storage {
135 |         case .memory:
136 |             break
137 | 
138 |         case .disk(let path), .all(let path):
139 |             var isDir: ObjCBool = false
140 |             let fileManager = FileManager.default
141 |             if !fileManager.fileExists(atPath: path, isDirectory: &isDir) {
142 |                 try fileManager.createDirectory(atPath: path, withIntermediateDirectories: false, attributes: nil)
143 |             }
144 |         }
145 |     }
146 | 
147 |     private func saveImage(_ image: UIImage, byPath path: String) throws {
148 |         // create file if not exist
149 |         let fileManager = FileManager.default
150 |         if !fileManager.fileExists(atPath: path) {
151 |             fileManager.createFile(atPath: path, contents: nil, attributes: nil)
152 |         }
153 | 
154 |         try image.pngData()?.write(to: URL(fileURLWithPath: path), options: .atomic)
155 |     }
156 | 
157 |     private func imagePath(base: String, key: String) -> String {
158 |         return (base as NSString).appendingPathComponent(key.replacingOccurrences(of: "/", with: "_"))
159 |     }
160 | }
161 | 


--------------------------------------------------------------------------------
/DLImageLoader/DLImageLoader.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  DLILManager.swift
  3 | //
  4 | //  Created by Andrey Lunevich
  5 | //  Copyright © 2015 Andrey Lunevich. All rights reserved.
  6 | 
  7 | //  Licensed under the Apache License, Version 2.0 (the "License");
  8 | //  you may not use this file except in compliance with the License.
  9 | //  You may obtain a copy of the License at
 10 | 
 11 | //  http://www.apache.org/licenses/LICENSE-2.0
 12 | 
 13 | //  Unless required by applicable law or agreed to in writing, software
 14 | //  distributed under the License is distributed on an "AS IS" BASIS,
 15 | //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 16 | //  See the License for the specific language governing permissions and
 17 | //  limitations under the License.
 18 | 
 19 | import UIKit
 20 | 
 21 | public final class DLImageLoader {
 22 | 
 23 |     public typealias Result = (_ result: Swift.Result<UIImage, DLImageLoader.Error>) -> Void
 24 | 
 25 |     public enum Error: Swift.Error {
 26 |         case invalidUrl
 27 |         case loadingFailed(Swift.Error)
 28 |         case corruptedImage
 29 |     }
 30 | 
 31 |     public var enableLog = false
 32 | 
 33 |     /**
 34 |      Instance method
 35 |      - returns: DLImageLoader instance.
 36 |      */
 37 |     public static let shared = DLImageLoader()
 38 | 
 39 |     private let session: URLSession
 40 |     private var cache: CacheManager?
 41 | 
 42 |     private init() {
 43 |         session = URLSession(configuration: URLSessionConfiguration.default,
 44 |                              delegate: nil,
 45 |                              delegateQueue: OperationQueue.main)
 46 | 
 47 |         do {
 48 |             setupCache(try CacheManager())
 49 |         } catch {
 50 |             log(message: error.localizedDescription)
 51 |         }
 52 |     }
 53 | 
 54 |     @discardableResult
 55 |     public func setupCache(_ cache: CacheManager) -> Self {
 56 |         self.cache?.clear()
 57 | 
 58 |         self.cache = cache
 59 | 
 60 |         return self
 61 |     }
 62 | 
 63 |     /**
 64 |      Load image from url
 65 |      - parameter url: The url of image.
 66 |      - parameter into: UIImageView in which will display image.
 67 |      - parameter completion: Completion block that will be called after image loading.
 68 |      */
 69 |     @discardableResult
 70 |     public func load(_ url: URL?,
 71 |                      placeholder: UIImage? = nil,
 72 |                      into imageView: UIImageView,
 73 |                      apply transformations: [Transformation] = [],
 74 |                      cacheStrategy: CacheStrategy = .tranformed(key: nil),
 75 |                      completion: Result? = nil) -> URLSessionDataTask? {
 76 |         imageView.image = placeholder
 77 | 
 78 |         guard let url = url else {
 79 |             completion?(.failure(.invalidUrl))
 80 | 
 81 |             return nil
 82 |         }
 83 | 
 84 |         return load(URLRequest(url: url),
 85 |                     into: imageView,
 86 |                     apply: transformations,
 87 |                     cacheStrategy: cacheStrategy,
 88 |                     completion: completion)
 89 |     }
 90 | 
 91 |     /**
 92 |      Load image from request
 93 |      - parameter request: The request of image.
 94 |      - parameter into: UIImageView in which will display image.
 95 |      - parameter completion: Completion block that will be called after image loading.
 96 |      */
 97 |     @discardableResult
 98 |     public func load(_ request: URLRequest,
 99 |                      placeholder: UIImage? = nil,
100 |                      into imageView: UIImageView,
101 |                      apply transformations: [Transformation] = [],
102 |                      cacheStrategy: CacheStrategy = .tranformed(key: nil),
103 |                      completion: Result? = nil) -> URLSessionDataTask? {
104 |         imageView.image = placeholder
105 | 
106 |         return load(request, apply: transformations, cacheStrategy: cacheStrategy) { result in
107 |             switch result {
108 |             case .success(let image):
109 |                 if let completion = completion {
110 |                     completion(.success(image))
111 |                 } else {
112 |                     imageView.image = image
113 |                     imageView.setNeedsDisplay()
114 |                 }
115 | 
116 |             case .failure(let error):
117 |                 completion?(.failure(error))
118 |             }
119 |         }
120 |     }
121 | 
122 |     /**
123 |      Load image from url
124 |      - parameter url: The url of image.
125 |      - parameter completion: Completion block that will be called after image loading.
126 |      */
127 |     @discardableResult
128 |     public func load(_ url: URL?,
129 |                      apply transformations: [Transformation] = [],
130 |                      cacheStrategy: CacheStrategy = .tranformed(key: nil),
131 |                      completion: Result? = nil) -> URLSessionDataTask? {
132 |         guard let url = url else {
133 |             completion?(.failure(.invalidUrl))
134 | 
135 |             return nil
136 |         }
137 | 
138 |         return load(URLRequest(url: url),
139 |                     apply: transformations,
140 |                     cacheStrategy: cacheStrategy,
141 |                     completion: completion)
142 |     }
143 | 
144 |     /**
145 |      Load image from request
146 |      - parameter request: The request of image.
147 |      - parameter completion: Completion block that will be called after image loading.
148 |      */
149 |     @discardableResult
150 |     public func load(_ request: URLRequest,
151 |                      apply transformations: [Transformation] = [],
152 |                      cacheStrategy: CacheStrategy = .tranformed(key: nil),
153 |                      completion: Result? = nil) -> URLSessionDataTask? {
154 |         guard let url = request.url?.absoluteString, !url.isEmpty else {
155 |             completion?(.failure(.invalidUrl))
156 | 
157 |             return nil
158 |         }
159 | 
160 |         log(message: "loading image from url => \(url)")
161 | 
162 |         if let image = try? image(for: cacheStrategy, url: url) {
163 |             log(message: "got an image from the cache")
164 | 
165 |             completion?(.success(image))
166 | 
167 |             return nil
168 |         }
169 | 
170 |         let task = session.dataTask(with: request) { [weak self] (data, response, error) in
171 |             if let error = error {
172 |                 completion?(.failure(.loadingFailed(error)))
173 | 
174 |                 self?.log(message: "error image loading \(error)")
175 |             } else {
176 |                 if let data = data, let image = UIImage(data: data) {
177 |                     DispatchQueue.global(qos: .userInitiated).async {
178 |                         var result = image
179 |                         for transformation in transformations {
180 |                             result = transformation.transform(result)
181 |                         }
182 | 
183 |                         // save loaded image to cache
184 |                         try? self?.saveImage(original: image, transformed: result, strategy: cacheStrategy, url: url)
185 | 
186 |                         DispatchQueue.main.async {
187 |                             completion?(.success(result))
188 | 
189 |                             self?.log(message: "loaded image from url => \(url)")
190 |                         }
191 |                     }
192 |                 } else {
193 |                     completion?(.failure(.corruptedImage))
194 |                 }
195 |             }
196 |         }
197 | 
198 |         task.resume()
199 | 
200 |         return task
201 |     }
202 | 
203 |     /**
204 |      Cancel task
205 |      - parameter url: Url to stop a task
206 |      */
207 |     public func cancelOperation(url: URL?) {
208 |         allTasks(of: session) { tasks in
209 |             for task in tasks where task.currentRequest?.url == url {
210 |                 task.cancel()
211 |             }
212 |         }
213 |     }
214 | 
215 |     /**
216 |      Stop all active tasks
217 |      */
218 |     public func cancelAllOperations() {
219 |         allTasks(of: session) { tasks in
220 |             for task in tasks {
221 |                 task.cancel()
222 |             }
223 |         }
224 |     }
225 | 
226 |     /**
227 |      Clear cache of DLImageLoader
228 |      */
229 |     public func clearCache(_ completion: ((_ error: Swift.Error?) -> Void)? = nil) {
230 |         cache?.clear(completion)
231 |     }
232 | 
233 | 
234 |     // MARK: Private Methods
235 | 
236 |     private func image(for strategy: CacheStrategy, url: String) throws -> UIImage? {
237 |         var image: UIImage?
238 | 
239 |         switch strategy {
240 |         case .original(let key), .tranformed(let key):
241 |             image = try cache?.image(forKey: key ?? url)
242 | 
243 |         case .both(let original, let tranformed):
244 |             image = try cache?.image(forKey: original ?? url)
245 | 
246 |             if image == nil {
247 |                 image = try cache?.image(forKey: tranformed ?? url)
248 |             }
249 |         }
250 | 
251 |         return image
252 |     }
253 | 
254 |     private func saveImage(original: UIImage, transformed: UIImage, strategy: CacheStrategy, url: String) throws {
255 |         switch strategy {
256 |         case .original(let key):
257 |             try cache?.saveImage(original, forKey: key ?? url)
258 | 
259 |         case .tranformed(let key):
260 |             try cache?.saveImage(transformed, forKey: key ?? "\(url)+transformed")
261 | 
262 |         case .both(let originalKey, let tranformedKey):
263 |             try cache?.saveImage(original, forKey: originalKey ?? url)
264 | 
265 |             try cache?.saveImage(transformed, forKey: tranformedKey ?? "\(url)+transformed")
266 |         }
267 |     }
268 | 
269 |     private func allTasks(of session: URLSession, completionHandler: @escaping ([URLSessionTask]) -> Void) {
270 |         session.getTasksWithCompletionHandler { (data, upload, download) in
271 |             let tasks = data as [URLSessionTask] + upload as [URLSessionTask] + download as [URLSessionTask]
272 | 
273 |             completionHandler(tasks)
274 |         }
275 |     }
276 | 
277 |     private func log(message: String) {
278 |         if enableLog {
279 |             print("DLImageLoader: \(message)")
280 |         }
281 |     }
282 | }
283 | 


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/DLImageLoader/Strategies.swift:
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1 | public enum CacheStrategy {
2 | 
3 |     case original(key: String?)
4 |     case tranformed(key: String?)
5 |     case both(original: String?, tranformed: String?)
6 | }
7 | 


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/DLImageLoader/Transformation.swift:
--------------------------------------------------------------------------------
1 | import UIKit
2 | 
3 | public protocol Transformation {
4 | 
5 |     func transform(_ image: UIImage) -> UIImage
6 | }
7 | 


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/LICENSE:
--------------------------------------------------------------------------------
 1 | Copyright (c) 2013-present, Andrey Lunevich
 2 | 
 3 | Licensed under the Apache License, Version 2.0 (the "License");
 4 | you may not use this file except in compliance with the License.
 5 | You may obtain a copy of the License at
 6 | 
 7 |    http://www.apache.org/licenses/LICENSE-2.0
 8 | 
 9 | Unless required by applicable law or agreed to in writing, software
10 | distributed under the License is distributed on an "AS IS" BASIS,
11 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | See the License for the specific language governing permissions and
13 | limitations under the License.


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/README.md:
--------------------------------------------------------------------------------
 1 | DLImageLoader-iOS
 2 | =================
 3 | 
 4 | Image Loader for iOS. <br/>
 5 | This project aims to provide a reusable instrument for asynchronous image loading, caching and displaying.
 6 | 
 7 | ![Screenshot](https://raw.githubusercontent.com/AndreyLunevich/DLImageLoader-iOS/master/dlil.png)
 8 | 
 9 | ## Instalation
10 | 
11 | | Swift | DLImageLoader |
12 | | ----- | ------------- |
13 | | 5.X   | _             |
14 | | 4.X   | 4.2.0         |
15 | | 2.2   | 1.2.0-swift   |
16 | 
17 | [Objective-C](https://github.com/AndreyLunevich/DLImageLoader-iOS/tree/objc) - "DLImageLoader", "~> 2.2.0"
18 | 
19 | ### Cocoapods
20 | 
21 | [CocoaPods](http://cocoapods.org) is the recommended way to add DLImageLoader to your project.
22 | 
23 | 1. Add a pod entry for DLImageLoader to your Podfile `pod 'DLImageLoader'`
24 | 2. Install the pod(s) by running `pod install`.
25 | 
26 | ## Usage
27 | 
28 | ### Simple
29 | 
30 | <pre>
31 | DLImageLoader.shared.load("image_url_here", into: "UIImageView here")
32 | </pre>
33 | 
34 | ### Complete
35 | 
36 | <pre>
37 | DLImageLoader.shared.load("image_url_here", into: "UIImageView here") { result in
38 |     switch result {
39 |     case .success(let image):
40 | 
41 |     case .failure(let error):
42 | 
43 |     }
44 | }
45 | </pre>
46 | 
47 | ### Cancel loading operations
48 | 
49 | <pre>
50 | DLImageLoader.shared.cancelOperation(url: "image_url_here")
51 | </pre>
52 | 
53 | <pre>
54 | DLImageLoader.shared.cancelAllOperations()
55 | </pre>
56 | 
57 | 
58 | ## Plans
59 | 
60 | Objective-C version will be fully moved to [objc](https://github.com/AndreyLunevich/DLImageLoader-iOS/tree/objc) branch
61 | 
62 | ## Applications using DLImageLoader
63 | 
64 | [Share TV](https://itunes.apple.com/br/app/share-tv-rede-social-para/id1097456577?mt=8) |
65 | [Nootri The Nutrition Manager](https://itunes.apple.com/US/app/id912109727?mt=8) |
66 | [Plusarium](https://itunes.apple.com/us/app/plusarium/id901280642?l=ru&ls=1&mt=8) |
67 | [Naomuseum](https://itunes.apple.com/ru/app/naomuseum/id847290457?mt=8) | [Aerobia](https://itunes.apple.com/us/app/aerobia/id566375588?mt=8) | [StreetForm](https://itunes.apple.com/us/app/easy/id874395902?ls=1&mt=8)
68 | 
69 | ## License
70 | 
71 | See [LICENSE](https://github.com/AndreyLunevich/DLImageLoader-iOS/blob/master/LICENSE) for more information.


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/dlil.png:
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https://raw.githubusercontent.com/AndreyLunevich/DLImageLoader-iOS/977df6f4d114e4a12749fcc4538e86c1f0201b1b/dlil.png


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