Question

我收到错误

没有可见的@interfcae GlobalMediaPlayer声明了选择器添加子层

·H

    #import <Foundation/Foundation.h>
    #import <AVFoundation/AVFoundation.h>

    @interface GlobalMediaPlayer : NSObject
    +(GlobalMediaPlayer *)sharedInstance;
    -(void)playFromURL:(NSString *)url;

的.m

#import "GlobalMediaPlayer.h"


static GlobalMediaPlayer *sharedInstance = nil;

@interface GlobalMediaPlayer ()

{
    AVPlayer *avPlayer;
}

@end

@implementation GlobalMediaPlayer

-(id)init{
    if(self = [super init]){

    }
    return self;
}


+(GlobalMediaPlayer *)sharedInstance{

    if(!sharedInstance){
        sharedInstance = [[[self class] alloc] init];
    }
    return sharedInstance;
}

-(void)playFromURL:(NSString *)url{

    avPlayer = [AVPlayer playerWithURL:[NSURL URLWithString:@"http://www.someurl/something.mp3"]];


    AVPlayerLayer *avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
    avPlayerLayer.frame = CGRectMake(0, 0, 1920, 1020);
    //[self addSublayer:avPlayerLayer]; <---- No visible @interfcae GlobalMediaPlayer declares selector add sublayer error

    [avPlayer play];

}

使用它

[[GlobalMediaPlayer sharedInstance] playFromURL:resourceUrl];

Answer 1

将AVPlayer代码包装在一个单例中并没有什么好处，因为播放器需要能够在CALayer中呈现其视频，因此通常最好将播放器代码放在{{1}中1}}即将展示内容。

所以在你的视图控制器中：

UIViewController

修改我从示例代码中注意到，该网址指向MP3。在这种情况下，您根本不必担心创建@interface MyViewController: UIViewController @property (nonatomic, strong) AVPlayer *player; @property (nonatomic, weak) AVPlayerLayer *playerLayer; @end - (void)playFromURL:(NSString *)url { //Instantiate the player and player layer AVPlayer *player = [AVPlayer playerWithURL:url]; AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player]; //Add the player layer as a sublayer of the desired view or subview playerLayer.frame = self.view.frame; [self.view.layer addSublayer:playerLayer]; [player play]; //Retain a reference to the player and player layer for controls/removal self.avPlayer = player; self.playerLayer = playerLayer; }。只需实例化播放器并调用AVPlayerLayer即可。

添加子图层AVPlayer共享实例/管理器时出错

1 个答案: