iOS实现微信朋友圈视频截取功能-创新互联
序言
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功能其实看着挺简单,实现过程也踩了不少坑。一方面记录一下;另一方面也算是对实现过程的再一次梳理,这样大家看代码也会比较明白。
效果
我们先看看我实现的效果
实现
实现过程分析
整个功能可以分为三部分:
- 视频播放
这部分我们单独封装一个视频播放器即可
- 下边的滑动视图
这部分实现过程比较复杂,一共分成了4部分。灰色遮盖、左右把手滑块、滑块中间上下两条线、图片管理视图
控制器视图逻辑组装和功能实现
- 视频播放器的封装
这里使用AVPlayer、playerLayer、AVPlayerItem这三个类实现了视频播放功能;由于整个事件都是基于KVO监听的,所以增加了Block代码提供了对外监听使用。
#import "FOFMoviePlayer.h" @interface FOFMoviePlayer() { AVPlayerLooper *_playerLooper; AVPlayerItem *_playItem; BOOL _loop; } @property(nonatomic,strong)NSURL *url; @property(nonatomic,strong)AVPlayer *player; @property(nonatomic,strong)AVPlayerLayer *playerLayer; @property(nonatomic,strong)AVPlayerItem *playItem; @property (nonatomic,assign) CMTime duration; @end @implementation FOFMoviePlayer -(instancetype)initWithFrame:(CGRect)frame url:(NSURL *)url superLayer:(CALayer *)superLayer{ self = [super init]; if (self) { [self initplayers:superLayer]; _playerLayer.frame = frame; self.url = url; } return self; } -(instancetype)initWithFrame:(CGRect)frame url:(NSURL *)url superLayer:(CALayer *)superLayer loop:(BOOL)loop{ self = [self initWithFrame:frame url:url superLayer:superLayer]; if (self) { _loop = loop; } return self; } - (void)initplayers:(CALayer *)superLayer{ self.player = [[AVPlayer alloc] init]; self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; self.playerLayer.videoGravity = AVLayerVideoGravityResize; [superLayer addSublayer:self.playerLayer]; } - (void)initLoopPlayers:(CALayer *)superLayer{ self.player = [[AVQueuePlayer alloc] init]; self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player]; self.playerLayer.videoGravity = AVLayerVideoGravityResize; [superLayer addSublayer:self.playerLayer]; } -(void)fof_play{ [self.player play]; } -(void)fof_pause{ [self.player pause]; } #pragma mark - Observe -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void *)context{ if ([keyPath isEqualToString:@"status"]) { AVPlayerItem *item = (AVPlayerItem *)object; AVPlayerItemStatus status = [[change objectForKey:@"new"] intValue]; // 获取更改后的状态 if (status == AVPlayerItemStatusReadyToPlay) { _duration = item.duration;//只有在此状态下才能获取,不能在AVPlayerItem初始化后马上获取 NSLog(@"准备播放"); if (self.blockStatusReadyPlay) { self.blockStatusReadyPlay(item); } } else if (status == AVPlayerItemStatusFailed) { if (self.blockStatusFailed) { self.blockStatusFailed(); } AVPlayerItem *item = (AVPlayerItem *)object; NSLog(@"%@",item.error); NSLog(@"AVPlayerStatusFailed"); } else { self.blockStatusUnknown(); NSLog(@"%@",item.error); NSLog(@"AVPlayerStatusUnknown"); } }else if ([keyPath isEqualToString:@"tracking"]){ NSInteger status = [change[@"new"] integerValue]; if (self.blockTracking) { self.blockTracking(status); } if (status) {//正在拖动 [self.player pause]; }else{//停止拖动 } }else if ([keyPath isEqualToString:@"loadedTimeRanges"]){ NSArray *array = _playItem.loadedTimeRanges; CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次缓冲时间范围 CGFloat startSeconds = CMTimeGetSeconds(timeRange.start); CGFloat durationSeconds = CMTimeGetSeconds(timeRange.duration); NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度 double progress = totalBuffer/CMTimeGetSeconds(_duration); if (self.blockLoadedTimeRanges) { self.blockLoadedTimeRanges(progress); } NSLog(@"当前缓冲时间:%f",totalBuffer); }else if ([keyPath isEqualToString:@"playbackBufferEmpty"]){ NSLog(@"缓存不够,不能播放!"); }else if ([keyPath isEqualToString:@"playbackLikelyToKeepUp"]){ if (self.blockPlaybackLikelyToKeepUp) { self.blockPlaybackLikelyToKeepUp([change[@"new"] boolValue]); } } } -(void)setUrl:(NSURL *)url{ _url = url; [self.player replaceCurrentItemWithPlayerItem:self.playItem]; } -(AVPlayerItem *)playItem{ _playItem = [[AVPlayerItem alloc] initWithURL:_url]; //监听播放器的状态,准备好播放、失败、未知错误 [_playItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil]; // 监听缓存的时间 [_playItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil]; // 监听获取当缓存不够,视频加载不出来的情况: [_playItem addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil]; // 用于监听缓存足够播放的状态 [_playItem addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(private_playerMovieFinish) name:AVPlayerItemDidPlayToEndTimeNotification object:nil]; return _playItem; } - (void)private_playerMovieFinish{ NSLog(@"播放结束"); if (self.blockPlayToEndTime) { self.blockPlayToEndTime(); } if (_loop) {//默认提供一个循环播放的功能 [self.player pause]; CMTime time = CMTimeMake(1, 1); __weak typeof(self)this = self; [self.player seekToTime:time completionHandler:^(BOOL finished) { [this.player play]; }]; } } -(void)dealloc{ NSLog(@"-----销毁-----"); } @end
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