视频播放器

//  RootViewController.m
#import "RootViewController.h"
#import <MediaPlayer/MediaPlayer.h>
#define PATH @"http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"
@interface RootViewController ()
{
    //创建视频播放器
    MPMoviePlayerController * player;
}
@end

@implementation RootViewController


-(void)createBtn
{
    UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 100, 100);
    [btn setTitle:@"本地播放" forState:UIControlStateNormal];
    [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];
    btn.tag=1;
    [self.view addSubview:btn];
    UIButton * btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
    btn1.frame = CGRectMake(100, 200, 100, 100);
    [btn1 setTitle:@"网络播放" forState:UIControlStateNormal];
    [btn1 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    btn1.tag=2;
    [btn1 addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn1];
    UIButton * btn2 = [UIButton buttonWithType:UIButtonTypeCustom];
    btn2.frame = CGRectMake(100, 300, 100, 100);
    [btn2 setTitle:@"返回" forState:UIControlStateNormal];
    [btn2 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    btn2.tag=3;
    [btn2 addTarget:self action:@selector(pressBtn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn2];

}

-(void)pressBtn:(id)sender
{
//    <1>找到要播放的视频的路径
    NSString * path = [[NSBundle mainBundle] pathForResource:@"xiatianweidao" ofType:@"mp4"];
//    <2>将字符串路径转化成NSURL
//    NSURL * url = [NSURL fileURLWithPath:path];
    UIButton *btn =(UIButton*)sender;
    NSURL * url=nil;
    if (btn.tag==2) {
         url = [NSURL URLWithString:PATH];
    }
    else if (btn.tag==1){
        url = [NSURL fileURLWithPath:path];
    }
    else {
        [self finishPlaying:nil];
    }
    
    
    //<3>初始化视频播放器
    player = [[MPMoviePlayerController alloc]initWithContentURL:url];
    //视频播放器 是一个视图控制器 上面有一个自带的视图 所以此处需要设置一些视图的大小
    //<4>设置视图的大小
    player.view.frame = CGRectMake(0, 100, 320, 200);
    //<5>将player上的视图添加在当前视图上
    [self.view addSubview:player.view];
    //<6>视频播放器没有协议 所有视频播放器的一些操作必须借助通知中心完成 传递的数据信息 都是一些固定的字符串
    
    //通知是由视频播放器发送 当前的视图控制器作为通知的观察者
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(finishPlaying:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
   //<7>准备播放视频
    //将视频放在缓存中  这样做防止播放的时候出现卡顿的现象
    [player prepareToPlay];
}
-(void)finishPlaying:(NSNotification *)notification
{
    [player.view removeFromSuperview];
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self createBtn];
}