//  RootViewController.m#import "RootViewController.h"#import 
     
      #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];}