objective-c - 如何停止 AudioToolbox 的声音？

Question

我有两种不同的按钮按下声音 Action 。当我按下一个按钮时，它应该播放一种声音，当我按下另一个按钮时，它应该停止第一种声音并播放另一种声音，我该怎么做？

谢谢，

-(void) onButtonPressAlbina {
    [soundID2 stop];     
    NSString *soundPath = [[NSBundle mainBundle] pathForResource:@"albina" ofType:@"m4a"];
    SystemSoundID soundID;
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath: soundPath], &soundID);
    AudioServicesPlaySystemSound (soundID);
}

-(void) onButtonPressBalena {
    NSString *soundPath = [[NSBundle mainBundle] pathForResource:@"balena" ofType:@"m4a"];
    SystemSoundID soundID;
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath: soundPath], &soundID);
    AudioServicesPlaySystemSound (soundID);    
}

Answer 1

您无法停止通过“AudioServicesPlaySystemSound”播放的声音，但您可以使用“AVAudioPlayer”代替。

在您的对象中保留对“AVAudioPlayer”的引用，然后您可以调用 "stop"当你需要停止它的时候。

播放

#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVAudioPlayer.h>
AVAudioPlayer  *player;

// ...

NSString *path;
NSError *error;
path = [[NSBundle mainBundle] pathForResource:@"albina" ofType:@"m4a"];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) 
{    
  player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:&error];
  player.volume = 0.5f;
  [player prepareToPlay];
  [player setNumberOfLoops:0];
  [player play];    
} 

停止

if (player != nil)
{
  if (player.isPlaying == YES)
    [player stop];
}