airplay功能

创建Ui 的时候添加到view上

#import <MediaPlayer/MediaPlayer.h>

- (void)addAirPlay
{
    MPVolumeView *volume = [[MPVolumeView alloc] initWithFrame:CGRectMake(0, 100, 44, 44)];
    volume.showsVolumeSlider = NO;
    [volume sizeToFit];
    volume.backgroundColor = [UIColor grayColor];
    [self.view addSubview:volume];
}