├── DanchuParticle.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   ├── xcshareddata
    │   │   └── IDEWorkspaceChecks.plist
    │   └── xcuserdata
    │   │   └── xoul.xcuserdatad
    │   │       └── UserInterfaceState.xcuserstate
    └── xcuserdata
    │   └── xoul.xcuserdatad
    │       └── xcschemes
    │           └── xcschememanagement.plist
├── DanchuParticle
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   ├── AppIcon.appiconset
    │   │   └── Contents.json
    │   ├── Contents.json
    │   └── ic_danchu_gray.imageset
    │   │   ├── Contents.json
    │   │   ├── ic_danchu_gray@2x.png
    │   │   └── ic_danchu_gray@3x.png
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── Info.plist
    └── ViewController.swift
└── README.md


/DanchuParticle.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
  1 | // !$*UTF8*$!
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 37 | /* Begin PBXGroup section */
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 46 | 		03BAB309228E82A5009E8D9D /* Products */ = {
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 54 | 		03BAB30A228E82A5009E8D9D /* DanchuParticle */ = {
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 60 | 				03BAB312228E82A7009E8D9D /* Assets.xcassets */,
 61 | 				03BAB314228E82A7009E8D9D /* LaunchScreen.storyboard */,
 62 | 				03BAB317228E82A7009E8D9D /* Info.plist */,
 63 | 			);
 64 | 			path = DanchuParticle;
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 77 | 			);
 78 | 			buildRules = (
 79 | 			);
 80 | 			dependencies = (
 81 | 			);
 82 | 			name = DanchuParticle;
 83 | 			productName = DanchuParticle;
 84 | 			productReference = 03BAB308228E82A5009E8D9D /* DanchuParticle.app */;
 85 | 			productType = "com.apple.product-type.application";
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 89 | /* Begin PBXProject section */
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 91 | 			isa = PBXProject;
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 93 | 				LastSwiftUpdateCheck = 1020;
 94 | 				LastUpgradeCheck = 1020;
 95 | 				ORGANIZATIONNAME = "Suyeol Jeon";
 96 | 				TargetAttributes = {
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 99 | 					};
100 | 				};
101 | 			};
102 | 			buildConfigurationList = 03BAB303228E82A5009E8D9D /* Build configuration list for PBXProject "DanchuParticle" */;
103 | 			compatibilityVersion = "Xcode 9.3";
104 | 			developmentRegion = en;
105 | 			hasScannedForEncodings = 0;
106 | 			knownRegions = (
107 | 				en,
108 | 				Base,
109 | 			);
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111 | 			productRefGroup = 03BAB309228E82A5009E8D9D /* Products */;
112 | 			projectDirPath = "";
113 | 			projectRoot = "";
114 | 			targets = (
115 | 				03BAB307228E82A5009E8D9D /* DanchuParticle */,
116 | 			);
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118 | /* End PBXProject section */
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126 | 				03BAB313228E82A7009E8D9D /* Assets.xcassets in Resources */,
127 | 				03BAB311228E82A5009E8D9D /* Main.storyboard in Resources */,
128 | 			);
129 | 			runOnlyForDeploymentPostprocessing = 0;
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131 | /* End PBXResourcesBuildPhase section */
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133 | /* Begin PBXSourcesBuildPhase section */
134 | 		03BAB304228E82A5009E8D9D /* Sources */ = {
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136 | 			buildActionMask = 2147483647;
137 | 			files = (
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140 | 			);
141 | 			runOnlyForDeploymentPostprocessing = 0;
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143 | /* End PBXSourcesBuildPhase section */
144 | 
145 | /* Begin PBXVariantGroup section */
146 | 		03BAB30F228E82A5009E8D9D /* Main.storyboard */ = {
147 | 			isa = PBXVariantGroup;
148 | 			children = (
149 | 				03BAB310228E82A5009E8D9D /* Base */,
150 | 			);
151 | 			name = Main.storyboard;
152 | 			sourceTree = "<group>";
153 | 		};
154 | 		03BAB314228E82A7009E8D9D /* LaunchScreen.storyboard */ = {
155 | 			isa = PBXVariantGroup;
156 | 			children = (
157 | 				03BAB315228E82A7009E8D9D /* Base */,
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159 | 			name = LaunchScreen.storyboard;
160 | 			sourceTree = "<group>";
161 | 		};
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169 | 				CLANG_ANALYZER_NONNULL = YES;
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171 | 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
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197 | 				CODE_SIGN_IDENTITY = "iPhone Developer";
198 | 				COPY_PHASE_STRIP = NO;
199 | 				DEBUG_INFORMATION_FORMAT = dwarf;
200 | 				ENABLE_STRICT_OBJC_MSGSEND = YES;
201 | 				ENABLE_TESTABILITY = YES;
202 | 				GCC_C_LANGUAGE_STANDARD = gnu11;
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204 | 				GCC_NO_COMMON_BLOCKS = YES;
205 | 				GCC_OPTIMIZATION_LEVEL = 0;
206 | 				GCC_PREPROCESSOR_DEFINITIONS = (
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208 | 					"$(inherited)",
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210 | 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
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284 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
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286 | 				DEVELOPMENT_TEAM = N2C267LBVY;
287 | 				INFOPLIST_FILE = DanchuParticle/Info.plist;
288 | 				LD_RUNPATH_SEARCH_PATHS = (
289 | 					"$(inherited)",
290 | 					"@executable_path/Frameworks",
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295 | 				TARGETED_DEVICE_FAMILY = "1,2";
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341 | }
342 | 


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


--------------------------------------------------------------------------------
/DanchuParticle.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
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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 | 


--------------------------------------------------------------------------------
/DanchuParticle.xcodeproj/project.xcworkspace/xcuserdata/xoul.xcuserdatad/UserInterfaceState.xcuserstate:
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https://raw.githubusercontent.com/StyleShare/DanchuParticle/9822ce51e7b79b2de726d55e392def2ce008c282/DanchuParticle.xcodeproj/project.xcworkspace/xcuserdata/xoul.xcuserdatad/UserInterfaceState.xcuserstate


--------------------------------------------------------------------------------
/DanchuParticle.xcodeproj/xcuserdata/xoul.xcuserdatad/xcschemes/xcschememanagement.plist:
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 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>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>DanchuParticle.xcscheme_^#shared#^_</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | </dict>
14 | </plist>
15 | 


--------------------------------------------------------------------------------
/DanchuParticle/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  DanchuParticle
 4 | //
 5 | //  Created by Suyeol Jeon on 17/05/2019.
 6 | //  Copyright © 2019 Suyeol Jeon. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |   var window: UIWindow?
15 | 
16 | 
17 |   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
18 |     // Override point for customization after application launch.
19 |     return true
20 |   }
21 | 
22 |   func applicationWillResignActive(_ application: UIApplication) {
23 |     // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |     // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
25 |   }
26 | 
27 |   func applicationDidEnterBackground(_ application: UIApplication) {
28 |     // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |   }
31 | 
32 |   func applicationWillEnterForeground(_ application: UIApplication) {
33 |     // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
34 |   }
35 | 
36 |   func applicationDidBecomeActive(_ application: UIApplication) {
37 |     // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |   }
39 | 
40 |   func applicationWillTerminate(_ application: UIApplication) {
41 |     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |   }
43 | 
44 | 
45 | }
46 | 
47 | 


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


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


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/DanchuParticle/Assets.xcassets/ic_danchu_gray.imageset/Contents.json:
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 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "universal",
 5 |       "scale" : "1x"
 6 |     },
 7 |     {
 8 |       "idiom" : "universal",
 9 |       "filename" : "ic_danchu_gray@2x.png",
10 |       "scale" : "2x"
11 |     },
12 |     {
13 |       "idiom" : "universal",
14 |       "filename" : "ic_danchu_gray@3x.png",
15 |       "scale" : "3x"
16 |     }
17 |   ],
18 |   "info" : {
19 |     "version" : 1,
20 |     "author" : "xcode"
21 |   }
22 | }


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/DanchuParticle/Assets.xcassets/ic_danchu_gray.imageset/ic_danchu_gray@2x.png:
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https://raw.githubusercontent.com/StyleShare/DanchuParticle/9822ce51e7b79b2de726d55e392def2ce008c282/DanchuParticle/Assets.xcassets/ic_danchu_gray.imageset/ic_danchu_gray@2x.png


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/DanchuParticle/Assets.xcassets/ic_danchu_gray.imageset/ic_danchu_gray@3x.png:
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https://raw.githubusercontent.com/StyleShare/DanchuParticle/9822ce51e7b79b2de726d55e392def2ce008c282/DanchuParticle/Assets.xcassets/ic_danchu_gray.imageset/ic_danchu_gray@3x.png


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/DanchuParticle/Base.lproj/LaunchScreen.storyboard:
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 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
 5 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 6 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 7 |     </dependencies>
 8 |     <scenes>
 9 |         <!--View Controller-->
10 |         <scene sceneID="EHf-IW-A2E">
11 |             <objects>
12 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
13 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
14 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
15 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
16 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
17 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
18 |                     </view>
19 |                 </viewController>
20 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
21 |             </objects>
22 |             <point key="canvasLocation" x="53" y="375"/>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


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/DanchuParticle/Base.lproj/Main.storyboard:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
 5 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 6 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 7 |     </dependencies>
 8 |     <scenes>
 9 |         <!--View Controller-->
10 |         <scene sceneID="tne-QT-ifu">
11 |             <objects>
12 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
13 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
14 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
15 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
16 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
17 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
18 |                     </view>
19 |                 </viewController>
20 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
21 |             </objects>
22 |         </scene>
23 |     </scenes>
24 | </document>
25 | 


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/DanchuParticle/Info.plist:
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 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>APPL</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>UILaunchStoryboardName</key>
24 | 	<string>LaunchScreen</string>
25 | 	<key>UIMainStoryboardFile</key>
26 | 	<string>Main</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


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/DanchuParticle/ViewController.swift:
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 1 | //
 2 | //  ViewController.swift
 3 | //  DanchuParticle
 4 | //
 5 | //  Created by Suyeol Jeon on 17/05/2019.
 6 | //  Copyright © 2019 Suyeol Jeon. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | private final class Particle: UIImageView {
12 |   var acceleration: CGPoint = .zero
13 |   var velocity: CGPoint = .zero
14 |   var angle: CGFloat = 0 {
15 |     didSet {
16 |       self.transform = CGAffineTransform(rotationAngle: self.angle)
17 |     }
18 |   }
19 | }
20 | 
21 | final class ViewController: UIViewController {
22 |   private var particles = Set<Particle>()
23 |   private let gravity: CGFloat = 1
24 |   private let friction: CGFloat = 0.8
25 | 
26 |   private var timer: Timer?
27 | 
28 |   override func viewDidLoad() {
29 |     super.viewDidLoad()
30 | 
31 |     let displayLink = CADisplayLink(target: self, selector: #selector(frame))
32 |     displayLink.add(to: .current, forMode: .default)
33 |   }
34 | 
35 |   override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
36 |     super.touchesBegan(touches, with: event)
37 |     self.play()
38 |     self.timer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { [weak self] _ in
39 |       self?.play()
40 |     }
41 |   }
42 | 
43 |   override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
44 |     super.touchesEnded(touches, with: event)
45 |     self.timer?.invalidate()
46 |   }
47 | 
48 |   private func play() {
49 |     UIImpactFeedbackGenerator(style: .light).impactOccurred()
50 | 
51 |     let count = Int.random(in: 5...10)
52 |     for _ in 0..<count {
53 |       let view = Particle()
54 |       defer { view.layer.cornerRadius = view.frame.size.height / 2 }
55 |       view.image = UIImage(named: "ic_danchu_gray")?.withRenderingMode(.alwaysTemplate)
56 |       view.tintColor = UIColor(
57 |         red: 1,
58 |         green: 192 / 255,
59 |         blue: 54 / 255,
60 |         alpha: 1
61 |       )
62 |       self.view.addSubview(view)
63 |       self.particles.insert(view)
64 | 
65 |       let size = CGFloat.random(in: 30...50)
66 |       view.frame.size = CGSize(width: size, height: size)
67 |       view.center.x = self.view.frame.width / 2
68 |       view.center.y = self.view.frame.height / 2
69 |       view.acceleration = CGPoint(
70 |         x: CGFloat.random(in: -30..<30),
71 |         y: CGFloat.random(in: -100..<(-30))
72 |       )
73 |     }
74 |   }
75 | 
76 |   @objc private func frame(link: CADisplayLink) {
77 |     for view in self.particles {
78 |       view.acceleration.x *= (1 - self.friction)
79 |       view.acceleration.y *= (1 - self.friction)
80 |       view.velocity.x += view.acceleration.x
81 |       view.velocity.y += view.acceleration.y + self.gravity
82 |       view.center.x += view.velocity.x
83 |       view.center.y += view.velocity.y
84 |       view.angle += view.velocity.x / 10
85 | 
86 |       if view.frame.minY > self.view.frame.height {
87 |         self.particles.remove(view)
88 |         view.removeFromSuperview()
89 |       }
90 |     }
91 |   }
92 | }
93 | 


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/README.md:
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 1 | # DanchuParticle
 2 | 
 3 | A demo application for a danchu particle effect. This is a prototype to demonstrate the effect, which means that it has no performance optimization at all.
 4 | 
 5 | ![danchu-particle mov](https://user-images.githubusercontent.com/931655/57913365-6c299400-78c7-11e9-9691-c2908bda2fc1.gif)
 6 | 
 7 | ## How it works
 8 | 
 9 | It is implemented with the very basic knowledges of physics: acceleration, velocity, gravity and friction.
10 | 
11 | 1. Each time the user taps the screen, it generates a random number of views with a random acceleration.
12 | 2. On every tick, the friction affects the acceleration.
13 | 3. On every tick, the acceleration and the gravity affects the velocity.
14 | 4. On every tick, the velocity affects the frame origin.
15 | 
16 | ## Author
17 | 
18 | Suyeol Jeon (https://github.com/devxoul)
19 | 


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