引入系统框架

import <AVFoundation/AVFoundation.h>

import <AVKit/AVKit.h>

import <MediaPlayer/MediaPlayer.h>

//声明相关属性
@property (strong,nonatomic) AVPlayerViewController *playVC;
@property (strong,nonatomic) AVPlayer *player;
@property (strong,nonatomic) AVPlayerItem *item;

//播放视频代码

• (void)onButton:(UIButton *)button {

  //支持锁屏的时候继续播放
  [[AVAudioSession sharedInstance] setActive:YES error:nil];
  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

  NSString *strPath = [[NSBundle mainBundle] pathForResource:@"test1" ofType:@"mp4"];
  NSURL *url = [NSURL fileURLWithPath:strPath];
  AVAsset *asset = [AVAsset assetWithURL:url];
  self.item = [AVPlayerItem playerItemWithAsset:asset];
  self.player = [AVPlayer playerWithPlayerItem:self.item];
  self.playVC = [[AVPlayerViewController alloc] init];
  self.playVC.player = self.player;

  [[NSNotificationCenter defaultCenter] addObserver:self
  selector:@selector(playerItemDidReachEnd:)
  name:AVPlayerItemDidPlayToEndTimeNotification
  object:_item];

  self.player.allowsExternalPlayback = YES;
  self.player.usesExternalPlaybackWhileExternalScreenIsActive = YES;

  __weak typeof(self) weakSelf = self;
  [self presentViewController:self.playVC animated:YES completion:^{

    [weakSelf.player play];
    
    //添加选择AirPlay设备的按钮
    MPVolumeView *volumeView = [[MPVolumeView alloc] init] ;
    volumeView.showsRouteButton = YES;
    volumeView.showsVolumeSlider = NO;
    volumeView.center = CGPointMake(100, 100);
    [[UIApplication sharedApplication].keyWindow addSubview:volumeView];
  

  }];

}

//如果想在iPhone锁屏的时候，AirPlay设备继续播放，还需在Info.plist设置App的后台模式支持AirPlay。
Required background modes 里面添加 App plays audio or streams audio/video using AirPlay！