├── CommentDemo.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   └── xcuserdata
    │   │   └── appleboyaug.xcuserdatad
    │   │       └── UserInterfaceState.xcuserstate
    └── xcuserdata
    │   └── appleboyaug.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           ├── CommentDemo.xcscheme
    │           └── xcschememanagement.plist
├── CommentDemo
    ├── 1111.png
    ├── AppDelegate.h
    ├── AppDelegate.m
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── Bullet
    │   ├── BulletBackgroudView.h
    │   ├── BulletBackgroudView.m
    │   ├── BulletManager.h
    │   ├── BulletManager.m
    │   ├── BulletView.h
    │   └── BulletView.m
    ├── Info.plist
    ├── ViewController.h
    ├── ViewController.m
    └── main.m
└── README.md


/CommentDemo.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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337 | 


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6 |    </FileRef>
7 | </Workspace>
8 | 


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33 |             endingLineNumber = "71"
34 |             landmarkName = "-startAnimation"
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36 |             <Locations>
37 |                <Location
38 |                   shouldBeEnabled = "Yes"
39 |                   ignoreCount = "0"
40 |                   continueAfterRunningActions = "No"
41 |                   symbolName = "-[BulletView startAnimation]"
42 |                   moduleName = "CommentDemo"
43 |                   usesParentBreakpointCondition = "Yes"
44 |                   urlString = "file:///Users/appleboyaug/Desktop/CommentDemo/CommentDemo/Bullet/BulletView.m"
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53 |                   shouldBeEnabled = "Yes"
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57 |                   moduleName = "CommentDemo"
58 |                   usesParentBreakpointCondition = "Yes"
59 |                   urlString = "file:///Users/appleboyaug/Desktop/CommentDemo/CommentDemo/Bullet/BulletView.m"
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67 |             </Locations>
68 |          </BreakpointContent>
69 |       </BreakpointProxy>
70 |    </Breakpoints>
71 | </Bucket>
72 | 


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 2 | <Scheme
 3 |    LastUpgradeVersion = "0720"
 4 |    version = "1.3">
 5 |    <BuildAction
 6 |       parallelizeBuildables = "YES"
 7 |       buildImplicitDependencies = "YES">
 8 |       <BuildActionEntries>
 9 |          <BuildActionEntry
10 |             buildForTesting = "YES"
11 |             buildForRunning = "YES"
12 |             buildForProfiling = "YES"
13 |             buildForArchiving = "YES"
14 |             buildForAnalyzing = "YES">
15 |             <BuildableReference
16 |                BuildableIdentifier = "primary"
17 |                BlueprintIdentifier = "C30D0FA61C78662C008C7F4F"
18 |                BuildableName = "CommentDemo.app"
19 |                BlueprintName = "CommentDemo"
20 |                ReferencedContainer = "container:CommentDemo.xcodeproj">
21 |             </BuildableReference>
22 |          </BuildActionEntry>
23 |       </BuildActionEntries>
24 |    </BuildAction>
25 |    <TestAction
26 |       buildConfiguration = "Debug"
27 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
28 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
29 |       shouldUseLaunchSchemeArgsEnv = "YES">
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31 |       </Testables>
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33 |          <BuildableReference
34 |             BuildableIdentifier = "primary"
35 |             BlueprintIdentifier = "C30D0FA61C78662C008C7F4F"
36 |             BuildableName = "CommentDemo.app"
37 |             BlueprintName = "CommentDemo"
38 |             ReferencedContainer = "container:CommentDemo.xcodeproj">
39 |          </BuildableReference>
40 |       </MacroExpansion>
41 |       <AdditionalOptions>
42 |       </AdditionalOptions>
43 |    </TestAction>
44 |    <LaunchAction
45 |       buildConfiguration = "Debug"
46 |       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
47 |       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
48 |       launchStyle = "0"
49 |       useCustomWorkingDirectory = "NO"
50 |       ignoresPersistentStateOnLaunch = "NO"
51 |       debugDocumentVersioning = "YES"
52 |       debugServiceExtension = "internal"
53 |       allowLocationSimulation = "YES">
54 |       <BuildableProductRunnable
55 |          runnableDebuggingMode = "0">
56 |          <BuildableReference
57 |             BuildableIdentifier = "primary"
58 |             BlueprintIdentifier = "C30D0FA61C78662C008C7F4F"
59 |             BuildableName = "CommentDemo.app"
60 |             BlueprintName = "CommentDemo"
61 |             ReferencedContainer = "container:CommentDemo.xcodeproj">
62 |          </BuildableReference>
63 |       </BuildableProductRunnable>
64 |       <AdditionalOptions>
65 |       </AdditionalOptions>
66 |    </LaunchAction>
67 |    <ProfileAction
68 |       buildConfiguration = "Release"
69 |       shouldUseLaunchSchemeArgsEnv = "YES"
70 |       savedToolIdentifier = ""
71 |       useCustomWorkingDirectory = "NO"
72 |       debugDocumentVersioning = "YES">
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74 |          runnableDebuggingMode = "0">
75 |          <BuildableReference
76 |             BuildableIdentifier = "primary"
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78 |             BuildableName = "CommentDemo.app"
79 |             BlueprintName = "CommentDemo"
80 |             ReferencedContainer = "container:CommentDemo.xcodeproj">
81 |          </BuildableReference>
82 |       </BuildableProductRunnable>
83 |    </ProfileAction>
84 |    <AnalyzeAction
85 |       buildConfiguration = "Debug">
86 |    </AnalyzeAction>
87 |    <ArchiveAction
88 |       buildConfiguration = "Release"
89 |       revealArchiveInOrganizer = "YES">
90 |    </ArchiveAction>
91 | </Scheme>
92 | 


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 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>CommentDemo.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>C30D0FA61C78662C008C7F4F</key>
16 | 		<dict>
17 | 			<key>primary</key>
18 | 			<true/>
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20 | 	</dict>
21 | </dict>
22 | </plist>
23 | 


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--------------------------------------------------------------------------------
/CommentDemo/AppDelegate.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.h
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface AppDelegate : UIResponder <UIApplicationDelegate>
12 | 
13 | @property (strong, nonatomic) UIWindow *window;
14 | 
15 | 
16 | @end
17 | 
18 | 


--------------------------------------------------------------------------------
/CommentDemo/AppDelegate.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.m
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import "AppDelegate.h"
10 | 
11 | @interface AppDelegate ()
12 | 
13 | @end
14 | 
15 | @implementation AppDelegate
16 | 
17 | 
18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
19 |     // Override point for customization after application launch.
20 |     return YES;
21 | }
22 | 
23 | - (void)applicationWillResignActive:(UIApplication *)application {
24 |     // 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.
25 |     // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
26 | }
27 | 
28 | - (void)applicationDidEnterBackground:(UIApplication *)application {
29 |     // 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.
30 |     // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
31 | }
32 | 
33 | - (void)applicationWillEnterForeground:(UIApplication *)application {
34 |     // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
35 | }
36 | 
37 | - (void)applicationDidBecomeActive:(UIApplication *)application {
38 |     // 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.
39 | }
40 | 
41 | - (void)applicationWillTerminate:(UIApplication *)application {
42 |     // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
43 | }
44 | 
45 | @end
46 | 


--------------------------------------------------------------------------------
/CommentDemo/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 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


--------------------------------------------------------------------------------
/CommentDemo/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 | 


--------------------------------------------------------------------------------
/CommentDemo/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="tne-QT-ifu">
 9 |             <objects>
10 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
19 |                     </view>
20 |                 </viewController>
21 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
22 |             </objects>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletBackgroudView.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BulletBackgroudView.h
 3 | //  CommentDemo
 4 | //
 5 | //  Created by jia feng on 2016/12/24.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @class BulletView;
12 | @interface BulletBackgroudView : UIView
13 | 
14 | - (void)dealTapGesture:(UITapGestureRecognizer *)gesture block:(void(^)(BulletView *bulletView))block;
15 | @end
16 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletBackgroudView.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BulletBackgroudView.m
 3 | //  CommentDemo
 4 | //
 5 | //  Created by jia feng on 2016/12/24.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import "BulletBackgroudView.h"
10 | #import "BulletView.h"
11 | 
12 | @implementation BulletBackgroudView
13 | 
14 | - (instancetype)init {
15 |     if (self = [super init]) {
16 |         self.userInteractionEnabled = NO;
17 |         
18 |     }
19 |     return self;
20 | }
21 | 
22 | 
23 | - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
24 |     if ([self findClickBulletView:point]) {
25 |         return self;
26 |     }
27 |     return nil;
28 | }
29 | 
30 | - (BulletView *)findClickBulletView:(CGPoint)point {
31 |     BulletView *bulletView = nil;
32 |     for (UIView *v in [self subviews]) {
33 |         if ([v isKindOfClass:[BulletView class]]) {
34 |             if ([v.layer.presentationLayer hitTest:point]) {
35 |                 bulletView = (BulletView *)v;
36 |                 break;
37 |             }
38 |         }
39 |     }
40 |     
41 |     return bulletView;
42 | }
43 | 
44 | - (void)dealTapGesture:(UITapGestureRecognizer *)gesture block:(void (^)(BulletView *bulletView))block {
45 |     CGPoint clickPoint =  [gesture locationInView:self];
46 |     
47 |     BulletView *bulletView = [self findClickBulletView:clickPoint];
48 |     if (bulletView) {
49 |         bulletView.backgroundColor = [UIColor blueColor];
50 |         dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
51 |             bulletView.backgroundColor = [UIColor redColor];
52 |         });
53 |         if (block) {
54 |             block(bulletView);
55 |         }
56 |     }
57 | 
58 | }
59 | 
60 | @end
61 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletManager.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BulletManager.h
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <Foundation/Foundation.h>
10 | @class BulletView;
11 | @interface BulletManager : NSObject
12 | @property (nonatomic, copy) void(^generateBulletBlock)(BulletView *view);
13 | - (void)start;
14 | - (void)stop;
15 | @end
16 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletManager.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  BulletManager.m
  3 | //  CommentDemo
  4 | //
  5 | //  Created by feng jia on 16/2/20.
  6 | //  Copyright © 2016年 caishi. All rights reserved.
  7 | //
  8 | 
  9 | #import "BulletManager.h"
 10 | #import "BulletView.h"
 11 | 
 12 | @interface BulletManager()
 13 | @property (nonatomic, strong) NSMutableArray *allComments;
 14 | @property (nonatomic, strong) NSMutableArray *tmpComments;
 15 | @property (nonatomic, strong) NSMutableArray *bulletQueue;
 16 | 
 17 | @property BOOL bStarted;
 18 | @property BOOL bStopAnimation;
 19 | 
 20 | @end
 21 | 
 22 | @implementation BulletManager
 23 | - (void)start {
 24 |     if (self.tmpComments.count == 0) {
 25 |         [self.tmpComments addObjectsFromArray:self.allComments];
 26 |     }
 27 |     self.bStarted = YES;
 28 |     self.bStopAnimation = NO;
 29 |     [self initBulletCommentView];
 30 |     
 31 | }
 32 | 
 33 | - (void)stop {
 34 |     self.bStopAnimation = YES;
 35 |     [self.bulletQueue enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
 36 |         BulletView *view = obj;
 37 |         [view stopAnimation];
 38 |         view = nil;
 39 |     }];
 40 | }
 41 | 
 42 | #pragma mark - Private
 43 | /**
 44 |  *  创建弹幕
 45 |  *
 46 |  *  @param comment    弹幕内容
 47 |  *  @param trajectory 弹道位置
 48 |  */
 49 | - (void)createBulletComment:(NSString *)comment trajectory:(Trajectory)trajectory {
 50 |     if (self.bStopAnimation) {
 51 |         return;
 52 |     }
 53 |     //创建一个弹幕view
 54 |     BulletView *view = [[BulletView alloc] initWithContent:comment];
 55 |     //设置运行轨迹
 56 |     view.trajectory = trajectory;
 57 |     __weak BulletView *weakBulletView = view;
 58 |     __weak BulletManager *myself = self;
 59 |     /**
 60 |      *  弹幕view的动画过程中的回调状态
 61 |      *  Start:创建弹幕在进入屏幕之前
 62 |      *  Enter:弹幕完全进入屏幕
 63 |      *  End:弹幕飞出屏幕后
 64 |      */
 65 |     view.moveBlock = ^(CommentMoveStatus status) {
 66 |         if (myself.bStopAnimation) {
 67 |             return ;
 68 |         }
 69 |         switch (status) {
 70 |             case Start:
 71 |                 //弹幕开始……将view加入弹幕管理queue
 72 |                 [self.bulletQueue addObject:weakBulletView];
 73 |                 break;
 74 |             case Enter: {
 75 |                 //弹幕完全进入屏幕，判断接下来是否还有内容，如果有则在该弹道轨迹对列中创建弹幕……
 76 |                 NSString *comment = [myself nextComment];
 77 |                 if (comment) {
 78 |                     [myself createBulletComment:comment trajectory:trajectory];
 79 |                 } else {
 80 |                     //说明到了评论的结尾了
 81 |                 }
 82 |                 break;
 83 |             }
 84 |             case End: {
 85 |                 //弹幕飞出屏幕后从弹幕管理queue中删除
 86 |                 if ([myself.bulletQueue containsObject:weakBulletView]) {
 87 |                     [myself.bulletQueue removeObject:weakBulletView];
 88 |                 }
 89 |                 if (myself.bulletQueue.count == 0) {
 90 |                     //说明屏幕上已经没有弹幕评论了，循环开始
 91 |                     [myself start];
 92 |                 }
 93 |                 break;
 94 |             }
 95 |             default:
 96 |                 break;
 97 |         }
 98 |     };
 99 |     //弹幕生成后，传到viewcontroller进行页面展示
100 |     if (self.generateBulletBlock) {
101 |         self.generateBulletBlock(view);
102 |     }
103 | }
104 | /**
105 |  *  初始化弹幕
106 |  */
107 | - (void)initBulletCommentView {
108 |     //初始化三条弹幕轨迹
109 |     NSMutableArray *arr = [NSMutableArray arrayWithArray:@[@(0), @(1), @(2)]];
110 |     for (int i = 3; i > 0; i--) {
111 |         NSString *comment = [self.tmpComments firstObject];
112 |         if (comment) {
113 |             [self.tmpComments removeObjectAtIndex:0];
114 |             //随机生成弹道创建弹幕进行展示（弹幕的随机飞入效果）
115 |             NSInteger index = arc4random()%arr.count;
116 |             Trajectory trajectory = [[arr objectAtIndex:index] intValue];
117 |             [arr removeObjectAtIndex:index];
118 |             [self createBulletComment:comment trajectory:trajectory];
119 |         } else {
120 |             //当弹幕小于三个，则跳出
121 |             break;
122 |         }
123 |     }
124 | }
125 | 
126 | - (NSString *)nextComment {
127 |     NSString *comment = [self.tmpComments firstObject];
128 |     if (comment) {
129 |         [self.tmpComments removeObjectAtIndex:0];
130 |     }
131 |     return comment;
132 | }
133 | 
134 | #pragma mark - Getter
135 | 
136 | - (NSMutableArray *)allComments {
137 |     if (!_allComments) {
138 |         _allComments = [NSMutableArray arrayWithObjects:
139 |                         @"我是一条弹幕1",
140 |                         @"我是一条弹幕我是一条弹幕2",
141 |                         @"弹幕3",
142 |                         @"弹幕4在这里",
143 |                         @"弹幕5 hhh",
144 |                         @"弹6", nil];
145 |     }
146 |     return _allComments;
147 | }
148 | 
149 | - (NSMutableArray *)tmpComments {
150 |     if (!_tmpComments) {
151 |         _tmpComments = [NSMutableArray array];
152 |     }
153 |     return _tmpComments;
154 | }
155 | 
156 | - (NSMutableArray *)bulletQueue {
157 |     if (!_bulletQueue) {
158 |         _bulletQueue = [NSMutableArray array];
159 |     }
160 |     return _bulletQueue;
161 | }
162 | 
163 | @end
164 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletView.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BulletView.h
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | typedef NS_ENUM(NSInteger, CommentMoveStatus) {
12 |     Start,
13 |     Enter,
14 |     End
15 |     
16 | };
17 | 
18 | typedef NS_ENUM(NSInteger, Trajectory) {
19 |     Trajectory_1,
20 |     Trajectory_2,
21 |     Trajectory_3
22 | };
23 | 
24 | @interface BulletView : UIView
25 | @property (nonatomic, copy) void(^moveBlock)(CommentMoveStatus status);
26 | @property Trajectory trajectory; //弹幕弹道定义
27 | @property (nonatomic, strong) UILabel *lbComment;
28 | 
29 | 
30 | - (instancetype)initWithContent:(NSString *)content;
31 | - (void)startAnimation;
32 | - (void)stopAnimation;
33 | 
34 | @end
35 | 


--------------------------------------------------------------------------------
/CommentDemo/Bullet/BulletView.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  BulletView.m
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import "BulletView.h"
10 | 
11 | #define mWidth [UIScreen mainScreen].bounds.size.width
12 | #define mHeight [UIScreen mainScreen].bounds.size.height
13 | #define mDuration   5
14 | #define Padding  5
15 | @interface BulletView ()
16 | 
17 | @property BOOL bDealloc;
18 | @end
19 | 
20 | @implementation BulletView
21 | 
22 | - (void)dealloc {
23 |     [self stopAnimation];
24 |     self.moveBlock = nil;
25 | }
26 | 
27 | - (instancetype)initWithContent:(NSString *)content {
28 |     if (self == [super init]) {
29 |         self.userInteractionEnabled = NO;
30 |         self.backgroundColor = [UIColor redColor];
31 |         NSDictionary *attributes = @{
32 |                                      NSFontAttributeName:[UIFont systemFontOfSize:14]
33 |                                      };
34 |         float width = [content sizeWithAttributes:attributes].width;
35 |         self.bounds = CGRectMake(0, 0, width + Padding*2, 25);
36 |         
37 |         self.lbComment = [UILabel new];
38 |         self.lbComment.frame = CGRectMake(Padding, 0, (width), 25);
39 |         self.lbComment.backgroundColor = [UIColor clearColor];
40 |         self.lbComment.text = content;
41 |         self.lbComment.font = [UIFont systemFontOfSize:14];
42 |         self.lbComment.textColor = [UIColor blackColor];
43 |         [self addSubview:self.lbComment];
44 |     }
45 |     return self;
46 | }
47 | 
48 | - (void)startAnimation {
49 |     
50 |     //根据定义的duration计算速度以及完全进入屏幕的时间
51 |     CGFloat wholeWidth = CGRectGetWidth(self.frame) + mWidth + 50;
52 |     CGFloat speed = wholeWidth/mDuration;
53 |     CGFloat dur = (CGRectGetWidth(self.frame) + 50)/speed;
54 |     
55 |     
56 |     __block CGRect frame = self.frame;
57 |     if (self.moveBlock) {
58 |         //弹幕开始进入屏幕
59 |         self.moveBlock(Start);
60 |     }
61 |     
62 |     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(dur * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
63 |         //避免重复，通过变量判断是否已经释放了资源，释放后，不在进行操作
64 |         if (self.bDealloc) {
65 |             return;
66 |         }
67 |         //dur时间后弹幕完全进入屏幕
68 |         if (self.moveBlock) {
69 |             self.moveBlock(Enter);
70 |         }
71 |     });
72 |     
73 |     //弹幕完全离开屏幕
74 |     [UIView animateWithDuration:mDuration delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
75 |         frame.origin.x = -CGRectGetWidth(frame);
76 |         self.frame = frame;
77 |     } completion:^(BOOL finished) {
78 |         if (self.moveBlock) {
79 |             self.moveBlock(End);
80 |         }
81 |         [self removeFromSuperview];
82 |     }];
83 | }
84 | 
85 | 
86 | - (void)stopAnimation {
87 |     self.bDealloc = YES;
88 |     [self.layer removeAllAnimations];
89 |     [self removeFromSuperview];
90 | }
91 | 
92 | @end
93 | 


--------------------------------------------------------------------------------
/CommentDemo/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 | </dict>
40 | </plist>
41 | 


--------------------------------------------------------------------------------
/CommentDemo/ViewController.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.h
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | 
11 | @interface ViewController : UIViewController
12 | 
13 | 
14 | @end
15 | 
16 | 


--------------------------------------------------------------------------------
/CommentDemo/ViewController.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.m
  3 | //  CommentDemo
  4 | //
  5 | //  Created by feng jia on 16/2/20.
  6 | //  Copyright © 2016年 caishi. All rights reserved.
  7 | //
  8 | 
  9 | #import "ViewController.h"
 10 | #import "BulletView.h"
 11 | #import "BulletManager.h"
 12 | #import "BulletBackgroudView.h"
 13 | @interface ViewController ()
 14 | @property (nonatomic, strong) BulletManager *bulletManager;
 15 | @property (nonatomic, strong) BulletBackgroudView *bulletBgView;
 16 | @end
 17 | 
 18 | @implementation ViewController
 19 | 
 20 | - (void)viewDidLoad {
 21 |     [super viewDidLoad];
 22 |     // Do any additional setup after loading the view, typically from a nib.
 23 |     UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
 24 |     btn.frame  = CGRectMake(100, 370, 100, 40);
 25 |     [btn setTitle:@"点击我" forState:UIControlStateNormal];
 26 |     [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
 27 |     [btn setBackgroundImage:[UIImage imageNamed:@"1111"] forState:UIControlStateNormal];
 28 |     [btn addTarget:self action:@selector(clickBtn) forControlEvents:UIControlEventTouchUpInside];
 29 |     [self.view addSubview:btn];
 30 |     
 31 |     
 32 |     
 33 |     [self configStartBtn];
 34 |     [self configStopBtn];
 35 |     [self addTapGesture];
 36 |     
 37 |     self.bulletManager = [[BulletManager alloc] init];
 38 |     __weak ViewController *myself = self;
 39 |     self.bulletManager.generateBulletBlock = ^(BulletView *bulletView) {
 40 |         [myself addBulletView:bulletView];
 41 |     };
 42 |     
 43 |     
 44 |     
 45 |     
 46 | }
 47 | 
 48 | - (void)didReceiveMemoryWarning {
 49 |     [super didReceiveMemoryWarning];
 50 |     // Dispose of any resources that can be recreated.
 51 | }
 52 | 
 53 | - (void)addTapGesture {
 54 |     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHandler:)];
 55 |     tap.cancelsTouchesInView = NO;
 56 |     [self.view addGestureRecognizer:tap];
 57 |     
 58 | }
 59 | 
 60 | - (void)tapHandler:(UITapGestureRecognizer *)gesture {
 61 |     [self.bulletBgView dealTapGesture:gesture block:^(BulletView *bulletView){
 62 |         NSLog(@"%@", bulletView.lbComment.text);
 63 |     }];
 64 | }
 65 | 
 66 | - (void)clickBtn {
 67 |     NSLog(@"clickBtn");
 68 | }
 69 | 
 70 | - (void)configStartBtn {
 71 |     UIButton *start = [UIButton buttonWithType:UIButtonTypeCustom];
 72 |     start.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2 - 80, 80, 70, 30);
 73 |     [start setTitle:@"start" forState:UIControlStateNormal];
 74 |     [start setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
 75 |     [start addTarget:self action:@selector(clickStart:) forControlEvents:UIControlEventTouchUpInside];
 76 |     [self.view addSubview:start];
 77 | }
 78 | 
 79 | - (void)configStopBtn {
 80 |     UIButton *stop = [UIButton buttonWithType:UIButtonTypeCustom];
 81 |     stop.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2 +10, 80, 70, 30);
 82 |     [stop setTitle:@"stop" forState:UIControlStateNormal];
 83 |     [stop setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
 84 |     [stop addTarget:self action:@selector(clickStop:) forControlEvents:UIControlEventTouchUpInside];
 85 |     [self.view addSubview:stop];
 86 | }
 87 | 
 88 | - (void)clickStart:(UIButton *)btn {
 89 |     [self.bulletManager start];
 90 | }
 91 | 
 92 | - (void)clickStop:(UIButton *)btn {
 93 |     [self.bulletManager stop];
 94 | }
 95 | 
 96 | - (void)addBulletView:(BulletView *)bulletView {
 97 |     bulletView.frame = CGRectMake(CGRectGetWidth(self.view.frame)+50, 20 + 34 * bulletView.trajectory, CGRectGetWidth(bulletView.bounds), CGRectGetHeight(bulletView.bounds));
 98 |     [self.bulletBgView addSubview:bulletView];
 99 |     [bulletView startAnimation];
100 | }
101 | 
102 | - (BulletBackgroudView *)bulletBgView {
103 |     if (!_bulletBgView) {
104 |         _bulletBgView = [[BulletBackgroudView alloc] init];
105 |         _bulletBgView.frame = CGRectMake(0, 300, CGRectGetWidth(self.view.frame), 150);
106 |         _bulletBgView.backgroundColor = [UIColor clearColor];
107 |         [self.view addSubview:_bulletBgView];
108 |     }
109 |     return _bulletBgView;
110 | }
111 | 
112 | 
113 | @end
114 | 


--------------------------------------------------------------------------------
/CommentDemo/main.m:
--------------------------------------------------------------------------------
 1 | //
 2 | //  main.m
 3 | //  CommentDemo
 4 | //
 5 | //  Created by feng jia on 16/2/20.
 6 | //  Copyright © 2016年 caishi. All rights reserved.
 7 | //
 8 | 
 9 | #import <UIKit/UIKit.h>
10 | #import "AppDelegate.h"
11 | 
12 | int main(int argc, char * argv[]) {
13 |     @autoreleasepool {
14 |         return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
15 |     }
16 | }
17 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # CommentDemo
2 | iOS弹幕的原理分析与实现详见：http://www.jianshu.com/p/f39b8abc8008
3 | 效果如下：
4 | 
5 | ![](http://7xr4e4.com1.z0.glb.clouddn.com/danmu_xiaoguo.gif)
6 | 


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