ios网络学习------9 播放网络视频

IOS提供了叫做MPMoviePlayerController MPMoviePlayerViewController两个类，可以轻松用来实现视频播放。MPMoviePlayerViewController只能全屏播放视频。

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#import "MainViewController.h"
#import <MediaPlayer/MediaPlayer.h>

@interface MainViewController ()
//视频播放器
@property (strong, nonatomic) MPMoviePlayerController *player;
@property (strong, nonatomic) UIImageView *imageView;
@end

@implementation MainViewController

- (void)viewDidLoad
{
[super viewDidLoad];
//实例化视频播放器
NSURL *url = [[NSBundle mainBundle]URLForResource:@"promo_full" withExtension:@"mp4"];

//视频播放是流媒体的播放模式，所谓流媒体就是把视频数据像流水一样，变加载，变播放。
// //提示：如果url中包含中文，需要添加百分号。
// NSString *urlString = @"http:www.xxx.com/video/xxx.mp4";
// NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

self.player = [[MPMoviePlayerController alloc]initWithContentURL:url];
//1设置播放器的大小
[self.player.view setFrame:CGRectMake(0, 0, 320, 180)]; //16:9是主流媒体的样式
//2将播放器视图添加到根视图
[self.view addSubview:self.player.view];

//4播放
[self.player play];
//[self.player stop];
//通过通知中心，以观察者模式监听视频播放状态
//1 监听播放状态
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(stateChange) name:MPMoviePlayerPlaybackStateDidChangeNotification object:nil];
//2 监听播放完成
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(finishedPlay) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
//3视频截图
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(caputerImage:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:nil];
//3视频截图
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(caputerImage:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:nil];

//4退出全屏通知
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(exitFullScreen) name:MPMoviePlayerDidExitFullscreenNotification object:nil];

//异步视频截图,可以在attimes指定一个或者多个时间。
[self.player requestThumbnailImagesAtTimes:@[@10.0f, @20.0f] timeOption:MPMovieTimeOptionNearestKeyFrame];

UIImageView *thumbnailImageView = [[UIImageView alloc]initWithFrame:CGRectMake(80, 200, 160, 90)];
self.imageView = thumbnailImageView;
[self.view addSubview:thumbnailImageView];
}

#pragma mark 退出全屏
- (void)exitFullScreen
{
NSLog(@"退出全屏");
}

#pragma mark -播放器事件监听
#pragma mark 视频截图 这个方法是异步方法
- (void)caputerImage:(NSNotification *)notification
{
NSLog(@"截图 %@", notification);
UIImage *image = notification.userInfo[@"MPMoviePlayerThumbnailImageKey"];
[self.imageView setImage:image];
}

#pragma mark 播放器事件监听
#pragma mark 播放完成
- (void)finishedPlay
{
NSLog(@"播放完成");
}

#pragma mark 播放器视频的监听
#pragma mark 播放状态变化
/*
MPMoviePlaybackStateStopped, //停止
MPMoviePlaybackStatePlaying, //播放
MPMoviePlaybackStatePaused, //暂停
MPMoviePlaybackStateInterrupted, //中断
MPMoviePlaybackStateSeekingForward, //快进
MPMoviePlaybackStateSeekingBackward //快退
*/
- (void)stateChange
{
switch (self.player.playbackState) {
case MPMoviePlaybackStatePaused:
NSLog(@"暂停");
break;
case MPMoviePlaybackStatePlaying:
//设置全屏播放
[self.player setFullscreen:YES animated:YES];
NSLog(@"播放");
break;
case MPMoviePlaybackStateStopped:
//注意：正常播放完成，是不会触发MPMoviePlaybackStateStopped事件的。
//调用[self.player stop];方法可以触发此事件。
NSLog(@"停止");
break;
default:
break;
}
}

@end