ios - 如何在Objective-C中播放来自url的音频

Question

This question already has answers here:

play audio from internet using AVAudioPlayer

(4个答案)


2年前关闭。




这是我的代码

 NSURL *url = [NSURL URLWithString:recentActivity.url];
 NSData *data = [NSData dataWithContentsOfURL:url];
 AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:data error:nil];
 [audioPlayer play];

而且没有播放音频

最佳答案

代码的问题(假设您使用的是ARC)是分配AVAudioPlayer，然后发送play消息，但是一旦方法返回ARC，就会立即分配AVAudioPlayer，因此您将无法收听声音。要解决此问题，请在AVAudioPlayer或某些属性中保留ivar实例。以下是ivar的示例

@implementation ViewController {
  AVAudioPlayer *audioPlayer;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  NSURL *url = [NSURL URLWithString:@"https://www.soundhelix.com/examples/mp3/SoundHelix-Song-2.mp3"];
  NSData *data = [NSData dataWithContentsOfURL:url];
  audioPlayer = [[AVAudioPlayer alloc] initWithData:data error:nil]; // Now we are assigning it in an instance variable thus ARC will not deallocate it.
  [audioPlayer play];
}


@end

关于ios - 如何在Objective-C中播放来自url的音频，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48334772/

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Answer 1

代码的问题(假设您使用的是ARC)是分配AVAudioPlayer，然后发送play消息，但是一旦方法返回ARC，就会立即分配AVAudioPlayer，因此您将无法收听声音。要解决此问题，请在AVAudioPlayer或某些属性中保留ivar实例。以下是ivar的示例

@implementation ViewController {
  AVAudioPlayer *audioPlayer;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  NSURL *url = [NSURL URLWithString:@"https://www.soundhelix.com/examples/mp3/SoundHelix-Song-2.mp3"];
  NSData *data = [NSData dataWithContentsOfURL:url];
  audioPlayer = [[AVAudioPlayer alloc] initWithData:data error:nil]; // Now we are assigning it in an instance variable thus ARC will not deallocate it.
  [audioPlayer play];
}


@end