iOS开发中用最简单的代码实现一个播放器

使用系统框架

  #import 

使用类

  @property (nonatomic, strong) AVPlayer *player;
  @property (nonatomic, strong) AVPlayerLayer *playerLayer;
  @property (nonatomic, strong) AVPlayerItem * item;
  @property (nonatomic, strong) AVURLAsset *asset;

创建一个视频播放器

1.自定义视频播放器继承自UIView
2.创建一个AVPlayerLayer对象playerLayer

     #pragma mark --- 懒加载
 - (AVPlayerLayer *)playerLayer{
    if (_playerLayer == nil) {
    _playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
     _playerLayer.backgroundColor = [UIColor blueColor].CGColor;
       }
    return _playerLayer;
}
- (AVPlayer *)player{
if (_player == nil) {
    _player = [[AVPlayer alloc] init];
}
return _player;
}

3.将playerLayer添加到自定义播放器的layer上

    [self.layer addSublayer:self.playerLayer];

4.在自定义播放器上添加播放/暂停按钮、进度条、播放时间、全屏按钮等
5.实现播放视频、全屏显示等一系列功能。

#pragma mark --- 播放、暂停
- (void)playOrPause:(UIButton*)btn{
NSLog(@"播放....");
btn.selected = !btn.selected;
[self addTimeObsever];
if (@available(iOS 10.0, *)) {
    if (self.player.timeControlStatus == AVPlayerTimeControlStatusPaused) {
        [_playBtn setImage:[UIImage imageNamed:@"暂停"] forState:UIControlStateNormal];
        [self.player play];
    } else if (self.player.timeControlStatus == AVPlayerTimeControlStatusPlaying) {
        [_playBtn setImage:[UIImage imageNamed:@"播放"] forState:UIControlStateNormal];
        [self.player pause];
    }
} else {
    // Fallback on earlier versions
    if (btn.selected == YES) {
        [_playBtn setImage:[UIImage imageNamed:@"暂停"] forState:UIControlStateNormal];
        [self.player play];
    }else{
        [_playBtn setImage:[UIImage imageNamed:@"播放"] forState:UIControlStateNormal];
        [self.player pause];
    }
}
}
- (void)playWithVideoURL:(NSURL *)videoURL{
AVURLAsset * asset = [AVURLAsset assetWithURL:videoURL];
AVPlayerItem * item = [AVPlayerItem playerItemWithAsset:asset];
[self.player replaceCurrentItemWithPlayerItem:item];
[item addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:NULL];
_item = item;
_asset = asset;
}

 #pragma mark --- 对播放器的状态进行监听
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
NSTimeInterval totalTime = CMTimeGetSeconds(_asset.duration);
if ([keyPath isEqualToString:@"status"]) { // 检测播放器状态
    AVPlayerStatus status = [[change objectForKey:@"new"] intValue];
    if (status == AVPlayerStatusFailed) {
        NSLog(@"资源不存在...");
    }else if (status == AVPlayerStatusUnknown){
        NSLog(@"发生未知错误...");
    }else if (status == AVPlayerStatusReadyToPlay){
        NSLog(@"达到播放状态...");
        _slider.maximumValue = totalTime;
        _allTimeLbl.text = [self stringWithTime:totalTime];
    }
}
}  

#pragma mark --- 屏幕发生旋转调用的方法
- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
{
[super traitCollectionDidChange:previousTraitCollection];

if (self.traitCollection.verticalSizeClass == UIUserInterfaceSizeClassRegular) { // 转至竖屏
    [self.videoView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.top.equalTo(self.view.mas_top).offset(100);
        make.height.equalTo(@(200));
    }];
} else if (self.traitCollection.verticalSizeClass == UIUserInterfaceSizeClassCompact) { // 转至横屏
    [self.videoView mas_remakeConstraints:^(MASConstraintMaker *make) {
        if (kSystemVersionFloat > 11.0) {
            make.left.bottom.right.top.equalTo(self.view.mas_safeAreaLayoutGuide);
        }else{
            make.left.bottom.right.top.equalTo(self.view);
        }            
    }];
}
}

注意

1.如果你在点击全屏按钮的时候并没有实现全屏，那可能是因为你设置的屏幕只能是竖屏

0.竖屏.png

这种情况需要我们再点击全屏的时候让屏幕能够旋转
我们需要实现AppDelegate中的一个代理方法

  - (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
// 设置是否支持横屏
if (self.isShouAutoRotate) {
    NSLog(@"支持各个屏幕方向...");
    return UIInterfaceOrientationMaskAll;
}
return UIInterfaceOrientationMaskPortrait;
}

我们可以去设置isShouAutoRotate这个属性，通过设置该属性控制屏幕是否能进行旋转。

详细看demohttps://gitee.com/liangsenliangsen/watch_videos.git
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