IOS开发：直播系统中视频播放功能实现

2019-03-06 15:22:00 浏览数 (1)

iOS中有多种方式可以实现视频播放功能：MPMoviePlayerController、MPMoviePlayerViewController、AVPlayer。这篇文章介绍前两个。

MPMoviePlayerController

MPMoviePlayerController支持MOV、MP4、M4V、3GP等常用格式的视频，它可以进行播放、暂停、停止、全屏的操作，虽然它是个视图控制器，但使用时需要把它的view添加到父视图上才能显示。 #import "ViewController.h" #import <MediaPlayer/MediaPlayer.h>

代码语言：javascript复制
@interface ViewController ()
@property (nonatomic, strong) MPMoviePlayerController *player;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];

    // 需要把播放器的view添加到父视图才能显示
    [self.view addSubview:self.player.view];
    [self addNotification];
}

- (IBAction)playButtonClick:(id)sender {
    [self.player play];
}

// 懒加载
- (MPMoviePlayerController *)player {
    if (!_player) {
        _player = [[MPMoviePlayerController alloc] initWithContentURL:[self getNetworkUrl]];
        _player.view.frame = CGRectMake(0, 64, self.view.bounds.size.width, 200);
    }
    return _player;
}

// 本地视频
- (NSURL *)getLocalUrl{
    NSString *urlString = [[NSBundle mainBundle] pathForResource:@"xxx.mp4" ofType:nil];
    NSURL *url = [NSURL fileURLWithPath:urlString];
    return url;
}

// 网络视频
- (NSURL *)getNetworkUrl{
    NSString *urlString = @"http://svideo.spriteapp.com/video/2016/0914/4cb325f6-7a09-11e6-a458-d4ae5296039d_wpd.mp4";
    NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    return url;
}

// 播放状态改变
- (void)mediaPlayerPlaybackStateChange:(NSNotification *)noti{
    switch (self.player.playbackState) {
        case MPMoviePlaybackStatePlaying:
            NSLog(@"正在播放");
            break;
        case MPMoviePlaybackStatePaused:
            NSLog(@"暂停播放");
            break;
            case MPMoviePlaybackStateStopped:
            NSLog(@"停止播放");
            break;
        case MPMoviePlaybackStateInterrupted:
            NSLog(@"播放中断");
            break;
        case MPMoviePlaybackStateSeekingForward:
            NSLog(@"向前");
            break;
        case MPMoviePlaybackStateSeekingBackward:
            NSLog(@"向后");
            break;
        default:
            break;
    }
}

// 播放完成
- (void)mediaPlayerPlaybackFinished:(NSNotification *)noti{
    NSLog(@"播放结束");
}

// 添加观察者监听视频状态
- (void)addNotification{
    NSNotificationCenter *noti = [NSNotificationCenter defaultCenter];
    [noti addObserver:self selector:@selector(mediaPlayerPlaybackStateChange:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:self.player];
    [noti addObserver:self selector:@selector(mediaPlayerPlaybackFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:self.player];
}

- (void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end

使用上面的代码，一个视频播放器就创建完成了，点击播放按钮即可播放视频。它能够播放本地和网络视频，播放信息是通过通知发出的，我们只需要添加观察者，就能监听视频的播放状态。效果图如下：

MPMoviePlayerViewController

使用上面的播放控制器，可以自己设置播放器的frame，把它添加到任意位置，而有时候我们的项目只需要全屏播放视频，不需要小屏播放，这时就可以用MPMoviePlayerViewController来实现了。 #import "ViewController.h" #import <MediaPlayer/MediaPlayer.h>

代码语言：javascript复制
@interface ViewController ()
@property (nonatomic, strong) MPMoviePlayerViewController *playerViewController;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // 点击播放按钮进行播放
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    // 每次退出播放界面都清空，防止再次点击不播放
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    self.playerViewController = nil;
}

// 播放按钮
- (IBAction)playButtonClick:(id)sender {
    [self presentMoviePlayerViewControllerAnimated:self.playerViewController];
}

// 懒加载
- (MPMoviePlayerViewController *)playerViewController{
    if (!_playerViewController) {
        _playerViewController = [[MPMoviePlayerViewController alloc]initWithContentURL:[self getNetworkUrl]];
        [self addNotification];
    }
    return _playerViewController;
}

// 本地视频
- (NSURL *)getLocalUrl{
    NSString *urlString = [[NSBundle mainBundle] pathForResource:@"xxx.mp4" ofType:nil];
    NSURL *url = [NSURL fileURLWithPath:urlString];
    return url;
}

// 网络视频
- (NSURL *)getNetworkUrl{
    NSString *urlString = @"http://svideo.spriteapp.com/video/2016/0914/4cb325f6-7a09-11e6-a458-d4ae5296039d_wpd.mp4";
    NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
    return url;
}

// 播放状态改变
-(void)mediaPlayerPlaybackStateChange:(NSNotification *)notification{
    switch (self.playerViewController.moviePlayer.playbackState) {
        case MPMoviePlaybackStatePlaying:
            NSLog(@"正在播放");
            break;
        case MPMoviePlaybackStatePaused:
            NSLog(@"暂停播放");
            break;
        case MPMoviePlaybackStateStopped:
            NSLog(@"停止播放");
            break;
        case MPMoviePlaybackStateInterrupted:
            NSLog(@"播放中断");
            break;
        case MPMoviePlaybackStateSeekingForward:
            NSLog(@"向前");
            break;
        case MPMoviePlaybackStateSeekingBackward:
            NSLog(@"向后");
            break;
        default:
            break;
    }
}

// 播放完成
-(void)mediaPlayerPlaybackFinished:(NSNotification *)notification{
    NSLog(@"播放结束");
}

// 添加观察者监听视频状态
-(void)addNotification{
    NSNotificationCenter *noti = [NSNotificationCenter defaultCenter];
    [noti addObserver:self selector:@selector(mediaPlayerPlaybackStateChange:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:self.playerViewController.moviePlayer];
    [noti addObserver:self selector:@selector(mediaPlayerPlaybackFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:self.playerViewController.moviePlayer];
}

-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
@end

效果图如下：

播放控制器是在正常控制器上模态弹出的，点击播放控制器左上角的Done按钮可退出播放控制器。

云点播

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