ios——MPMoviePlayerController截取视频缩略图 播放视频又可以截取视频缩略图

#import <AVKit/AVKit.h>
#import <MediaPlayer/MediaPlayer.h>
#import "ViewController.h"

@interface ViewController ()

@property (nonatomic,strong) MPMoviePlayerController *moviePlayer;//视频播放控制器

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
//    NSURL *url = [NSURL URLWithString:@"http://vf1.mtime.cn/Video/2012/04/23/mp4/120423212602431929.mp4"];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    //播放
    [self.moviePlayer play];

//添加通知
    [self addNotification];
    
    //获取缩略图
    [self thumbnailImageRequest];
}

/**
 *  取得本地文件路径
 *
 *  @return 文件路径
 */
-(NSURL *)getFileUrl{
    NSString *urlStr=[[NSBundle mainBundle] pathForResource:@"The New Look of OS X Yosemite.mp4" ofType:nil];
    NSURL *url=[NSURL fileURLWithPath:urlStr];
    return url;
}
/**
 *  取得网络文件路径
 *
 *  @return 文件路径
 */
-(NSURL *)getNetworkUrl{

NSString *urlStr = @"http://vf1.mtime.cn/Video/2012/04/23/mp4/120423212602431929.mp4";
    
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    
    NSURL *url = [NSURL URLWithString:urlStr];
    
    return url;
}
-(MPMoviePlayerController *)moviePlayer{

if (!_moviePlayer) {
        
        NSURL *url = [self getNetworkUrl];
        _moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:url];
        _moviePlayer.view.frame = self.view.bounds;
        _moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
        
        [self.view addSubview:_moviePlayer.view];
    }

return _moviePlayer;
}

/**
 *  获取视频缩略图
 */
-(void)thumbnailImageRequest{
    //获取13.0s、21.5s的缩略图
    [self.moviePlayer requestThumbnailImagesAtTimes:@[@13.0,@21.5] timeOption:MPMovieTimeOptionNearestKeyFrame];
}
/**
 *  添加通知监控媒体播放控制器状态
 */
-(void)addNotification{

NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    
   
[notificationCenter addObserver:self
selector:@selector(mediaPlayerPlaybackStateChange:)
name:MPMoviePlayerPlaybackStateDidChangeNotification
object:self.moviePlayer];
    
       [notificationCenter
addObserver:self selector:@selector(mediaPlayerPlaybackFinished:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.moviePlayer];
    
        [notificationCenter
addObserver:self
selector:@selector(mediaPlayerThumbnailRequestFinished:)
name:MPMoviePlayerThumbnailImageRequestDidFinishNotification
object:self.moviePlayer];
}

/**
 *  播放状态改变，注意播放完成时的状态是暂停
 *
 *  @param notification 通知对象
 */
-(void)mediaPlayerPlaybackStateChange:(NSNotification *)notification{
    switch (self.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;
        default:
            NSLog(@"播放状态:%li",self.moviePlayer.playbackState);
            break;
    }
}

/**
 *  播放完成
 *
 *  @param notification 通知对象
 */
-(void)mediaPlayerPlaybackFinished:(NSNotification *)notification{
    NSLog(@"播放完成.%li",self.moviePlayer.playbackState);
}

/**
 *  缩略图请求完成,此方法每次截图成功都会调用一次
 *
 *  @param notification 通知对象
 */
-(void)mediaPlayerThumbnailRequestFinished:(NSNotification *)notification{
    NSLog(@"视频截图完成.");
    UIImage *image=notification.userInfo[MPMoviePlayerThumbnailImageKey];
    //保存图片到相册(首次调用会请求用户获得访问相册权限)
    UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}

-(void)dealloc{
    //移除所有通知监控
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

由
于于开始升级了ios9，不管是模拟器还是真机播放都是黑屏，郁闷了好久好久，后来打印：App Transport Security has
blocked a cleartext HTTP (http://) resource load since it is insecure.
Temporary exceptions can be configured via your app's Info.plist file.

在plist文件设置了允许网络请求不安全，就可以了，详细做法请看我的文章：适配一栏关于ios9 的变化。