iOS 视频播放从零开始（二）

iOS 9之后苹果推荐使用AVPlayer进行视频播放，AVPlayer相对于MPMediaPlayerViewController功能更加强大,有更多的灵活性，当然，也需要你去自定义构建UI。其他优势，例如其扩展的AVQueuePlayer，可以实现视频无缝队列播放、多视频同时播放、视频转换、编解码等功能。

1、简单的播放

 // 1、得到视频的URLNSURL *movieURL = [NSURL fileURLWithPath:filePath];// 2、根据URL创建AVPlayerItemself.playerItem   = [AVPlayerItem playerItemWithURL:movieURL];// 3、把AVPlayerItem 提供给 AVPlayerself.player     = [AVPlayer playerWithPlayerItem:self.playerItem];// 4、AVPlayerLayer 显示视频。AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];playerLayer.frame       = self.view.bounds;//设置边界显示方式playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;[self.view.layer addSublayer:playerLayer];self.player play];

2、监听视频加载状态/设置缓存进度

#pragma mark - 观察者、通知
- (void) addObserverAndNotification {// 观察status属性[_playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:(NSKeyValueObservingOptionNew) context:nil];[_playerItem addObserver:self forKeyPath:@"status" options:(NSKeyValueObservingOptionNew) context:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];}#pragma mark - observe
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {AVPlayerItem *item = (AVPlayerItem *)object;if ([keyPath isEqualToString:@"status"]) {AVPlayerStatus status = [[change objectForKey:@"new"] intValue]; // 获取更改后的状态if (status == AVPlayerStatusReadyToPlay) {CMTime duration = item.duration; // 获取视频长度// 设置视频时间[self setMaxDuration:CMTimeGetSeconds(duration)];// 播放[self play];//监听播放进度[self monitoringPlayback:self.playerItem];} else if (status == AVPlayerStatusFailed) {NSLog(@"AVPlayerStatusFailed");} else {NSLog(@"AVPlayerStatusUnknown");}} else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {NSTimeInterval timeInterval = [self availableDuration]; // 缓冲时间CGFloat totalDuration = CMTimeGetSeconds(_playerItem.duration); // 总时间CGFloat progress = timeInterval / totalDuration;//在这里设置缓存进度[self.progressView setProgress:progress animated:YES]; // 更新缓冲条}
}

3、监听播放进度

#pragma mark - 观察播放进度
- (void)monitoringPlayback:(AVPlayerItem *)item {__weak typeof(self)WeakSelf = self;// 观察间隔, CMTime 为30分之一秒_playTimeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(1, 30.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {// 获取 item 当前播放秒float currentPlayTime = (double)item.currentTime.value/ item.currentTime.timescale;[WeakSelf updateVideoSlider:currentPlayTime];// 更新slider, 如果正在滑动则不更新if (_isSliding == NO) {[WeakSelf updateVideoSlider:currentPlayTime];}}];
}

4、设置进度

- (void)playerSliderValueChanged {_isSliding = YES;[self pause];    // 跳转到拖拽秒处CMTime changedTime = CMTimeMakeWithSeconds(self.slider.value, 1.0);[_playerItem seekToTime:changedTime completionHandler:^(BOOL finished) {
//        // 跳转完成后
//        _isSliding = NO;
//        [self play];}];
}

完整demo

@import AVFoundation;
@import MediaPlayer;
@interface ViewController ()
@property(nonatomic,strong) AVPlayer *player;
@property(nonatomic,strong) AVPlayerItem *playerItem;
@property(nonatomic,strong) id playTimeObserver;
@property(nonatomic,assign) BOOL isSliding; //是否正在滑动
/***  视频总秒数*/
@property (nonatomic, assign) NSInteger totalSeconds;
@property (nonatomic, weak) UISlider *slider;
@property (nonatomic, weak) UIProgressView *progressView;
@end
- (void)viewDidLoad {[super viewDidLoad];NSString *path = [[NSBundle mainBundle]pathForResource:@"loginmovie" ofType:@".mp4"];//    NSURL *url     = [NSURL fileURLWithPath:path];[self createAVPlayer:path];UIProgressView *progressView = [[UIProgressView alloc]initWithFrame:CGRectMake(5, 510,[UIScreen mainScreen].bounds.size.width-10, 0)];//进度条背景色progressView.trackTintColor = [UIColor lightGrayColor];//进度条缓存颜色progressView.progressTintColor = [UIColor greenColor];self.progressView = progressView;[self.view addSubview:progressView];//添加slideUISlider *slider = [[UISlider alloc]initWithFrame:CGRectMake(0, 500,[UIScreen mainScreen].bounds.size.width, 21)];slider.minimumTrackTintColor = [UIColor redColor];slider.maximumTrackTintColor = [UIColor clearColor];self.slider      = slider;[slider addTarget:self action:@selector(playerSliderValueChanged) forControlEvents:UIControlEventValueChanged];[self.view addSubview:slider];
}#pragma mark - MPMoviePlayerController
- (void)createAVPlayer:(NSString *)filePath {//在使用 AVPlayer 播放视频时，提供视频信息的是 AVPlayerItem，一个 AVPlayerItem 对应着一个URL视频资源// 1、得到视频的URLNSURL *movieURL = [NSURL fileURLWithPath:filePath];// 2、根据URL创建AVPlayerItemself.playerItem   = [AVPlayerItem playerItemWithURL:movieURL];// 3、把AVPlayerItem 提供给 AVPlayerself.player     = [AVPlayer playerWithPlayerItem:self.playerItem];// 4、AVPlayerLayer 显示视频。AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];playerLayer.frame       = self.view.bounds;//设置边界显示方式playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;[self.view.layer addSublayer:playerLayer];// 注册观察者，通知[self addObserverAndNotification];
}#pragma mark - 更新视频
- (void)updatePlayerWithURL:(NSURL *)url {_playerItem = [AVPlayerItem playerItemWithURL:url]; // create item[_player  replaceCurrentItemWithPlayerItem:_playerItem]; // replaceCurrentItem[self addObserverAndNotification]; // 注册观察者，通知
}#pragma mark - 观察者、通知
- (void) addObserverAndNotification {// 观察status属性[_playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:(NSKeyValueObservingOptionNew) context:nil];[_playerItem addObserver:self forKeyPath:@"status" options:(NSKeyValueObservingOptionNew) context:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];}#pragma mark - observe
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {AVPlayerItem *item = (AVPlayerItem *)object;if ([keyPath isEqualToString:@"status"]) {AVPlayerStatus status = [[change objectForKey:@"new"] intValue]; // 获取更改后的状态if (status == AVPlayerStatusReadyToPlay) {CMTime duration = item.duration; // 获取视频长度// 设置视频时间[self setMaxDuration:CMTimeGetSeconds(duration)];// 播放[self play];//监听播放进度[self monitoringPlayback:self.playerItem];} else if (status == AVPlayerStatusFailed) {NSLog(@"AVPlayerStatusFailed");} else {NSLog(@"AVPlayerStatusUnknown");}} else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {NSTimeInterval timeInterval = [self availableDuration]; // 缓冲时间CGFloat totalDuration = CMTimeGetSeconds(_playerItem.duration); // 总时间CGFloat progress = timeInterval / totalDuration;//在这里设置缓存进度[self.progressView setProgress:progress animated:YES]; // 更新缓冲条}
}#pragma mark - 设置视频时间总秒数
- (void) setMaxDuration:(CGFloat)seconds{self.slider.minimumValue = 0;self.slider.maximumValue = seconds;self.totalSeconds = seconds;NSLog(@"总秒数===%f",seconds);
}#pragma mark - 播放
- (void) play{[self.player play];
}#pragma mark - 暂停
- (void) pause{[self.player pause];
}#pragma mark - 观察播放进度
- (void)monitoringPlayback:(AVPlayerItem *)item {__weak typeof(self)WeakSelf = self;// 观察间隔, CMTime 为30分之一秒_playTimeObserver = [_player addPeriodicTimeObserverForInterval:CMTimeMake(1, 30.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {// 获取 item 当前播放秒float currentPlayTime = (double)item.currentTime.value/ item.currentTime.timescale;[WeakSelf updateVideoSlider:currentPlayTime];// 更新slider, 如果正在滑动则不更新if (_isSliding == NO) {[WeakSelf updateVideoSlider:currentPlayTime];}}];
}- (void)playerSliderValueChanged {_isSliding = YES;[self pause];    // 跳转到拖拽秒处CMTime changedTime = CMTimeMakeWithSeconds(self.slider.value, 1.0);[_playerItem seekToTime:changedTime completionHandler:^(BOOL finished) {
//        // 跳转完成后
//        _isSliding = NO;
//        [self play];}];
}#pragma mark - 获取缓存进度
- (NSTimeInterval)availableDuration {NSArray *loadedTimeRanges = [[self.player currentItem] loadedTimeRanges];CMTimeRange timeRange = [loadedTimeRanges.firstObject CMTimeRangeValue];// 获取缓冲区域float startSeconds = CMTimeGetSeconds(timeRange.start);float durationSeconds = CMTimeGetSeconds(timeRange.duration);NSTimeInterval result = startSeconds + durationSeconds;// 计算缓冲总进度return result;
}- (NSString *)convertTime:(CGFloat)second{NSDate *d = [NSDate dateWithTimeIntervalSince1970:second];NSDateFormatter *formatter = [[NSDateFormatter alloc] init];if (second/3600 >= 1) {[formatter setDateFormat:@"HH:mm:ss"];} else {[formatter setDateFormat:@"mm:ss"];}NSString *showtimeNew = [formatter stringFromDate:d];return showtimeNew;
}#pragma mark - 设置播放seconds
- (void) updateVideoSlider:(float) time{NSLog(@"time=%f",time);self.slider.value = time;
}#pragma mark - 播放完成后
- (void)playbackFinished:(NSNotification *)notification {NSLog(@"视频播放完成通知");_playerItem = [notification object];[_playerItem seekToTime:kCMTimeZero]; // item 跳转到初始//[_player play]; // 循环播放
}#pragma mark - 释放资源
- (void)dealloc {[self removeObserveAndNOtification];
}#pragma mark - 移除通知和观察者
- (void)removeObserveAndNOtification{[[NSNotificationCenter defaultCenter]removeObserver:self];[_player removeTimeObserver:_playTimeObserver]; // 移除playTimeObserver}[_player removeObserver:self forKeyPath:@"loadedTimeRanges"];[_player removeObserver:self forKeyPath:@"status"];
}

效果图：

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