Question

当我按下按钮，然后按另一个按钮时，声音重叠。如何解决这个问题，以便在按下另一个声音时第一个声音停止？

 - (void)playOnce:(NSString *)aSound {

NSString *path = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio setDelegate: self];
[theAudio setNumberOfLoops:0];
[theAudio setVolume:1.0];
[theAudio play];    
 }

- (void)playLooped:(NSString *)aSound {

NSString *path = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];
AVAudioPlayer* theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
[theAudio setDelegate: self];
// loop indefinitely
[theAudio setNumberOfLoops:-1];
[theAudio setVolume:1.0];
[theAudio play];
[theAudio release];


    }

Answer 1

在viewController的标题中声明你的AVAudioPlayer（每次播放声音时不要分配新的AVAudioPlayer）。这样你就可以在StopAudio方法中使用一个指针。

@interface myViewController : UIViewController <AVAudioPlayerDelegate> { 
    AVAudioPlayer *theAudio;
}
@property (nonatomic, retain) AVAudioPlayer *theAudio;
@end


@implementation myViewController
@synthesize theAudio;
- (void)dealloc {
    [theAudio release];
}
@end



- (void)playOnce:(NSString *)aSound {
    NSString *path = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];
    if(!theAudio){
        theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath:path] error:NULL];
    }
    [theAudio setDelegate: self];
    [theAudio setNumberOfLoops:0];
    [theAudio setVolume:1.0];
    [theAudio play];
}

- (void)playLooped:(NSString *)aSound {
    NSString *path = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];
    if(!theAudio){
        theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath:path] error:NULL];
    }
    [theAudio setDelegate: self];
    // loop indefinitely
    [theAudio setNumberOfLoops:-1];
    [theAudio setVolume:1.0];
    [theAudio play];
}

- (void)stopAudio {
    [theAudio stop];
    [theAudio setCurrentTime:0];
}

也一定要阅读Apple Docs

Answer 2

您可以执行以下操作：

    (void) playLooped: (NSString * ) aSound {
        NSString * path = [[NSBundle mainBundle] pathForResource: aSound ofType: @"caf"];

    //stop audio player from playing so the sound don't overlap
    if([theAudio isPlaying])
    {
        [theAudio stop]; //try this instead of stopAudio

    }

    if (!theAudio) {
        theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath: path] error: NULL];
    } 
    [theAudio setDelegate: self];
    // loop indefinitely
    [theAudio setNumberOfLoops: -1];
    [theAudio setVolume: 1.0];
    [theAudio play];
}

Answer 3

您发布的代码只播放一个声音，即发送给该方法的第一个声音。

如果您只想播放一个可更改的声音，请在停止播放器后释放音频，然后设置新声音。

Answer 4

在你的playOnce方法中，'path'变量未被使用 - 删除它以消除你的警告信息。你的playOnce没有设置任何东西，所以我不确定它应该如何工作 - 除非你先调用playLooped？您还需要在initWithContentsOfUrl之后调用prepareToPlay。

 - (void)playOnce:(NSString *)aSound {

  NSString *path = [[NSBundle mainBundle] pathForResource:aSound ofType:@"caf"];
  if (theAudio && [theAudio isPlaying]) {
    [theAudio stop]
  } else {
         theAudio = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath: path] error: NULL];
         [theAudio prepareToPlay];

         [theAudio setDelegate: self];
    [theAudio setNumberOfLoops: 1];
    [theAudio setVolume: 1.0];
    [theAudio play];
  }

}

Answer 5

添加一项检查以确定玩家是否已在每种方法的开头播放：

if (theAudio.playing == YES) {
    [theAudio stop];
}

AVAudioPlayer Class Reference

Answer 6

您需要对BOOL值进行utizilize以使其正常工作。

你的.m文件中的

在@implementation之前放了这个：

static BOOL soundIsPlaying = NO;

然后你的IBAction需要看起来像这样：

- (IBAction)play {
    if (soundIsPlaying == YES) {
        [theAudio release];
        soundIsPlaying = NO;

    }

    else if (soundIsPlaying == NO) {
        NSString *path = [[NSBundle mainBundle] pathForResource:@"SOUNDFILENAME" ofType:@"wav"];
        theAudio=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
        theAudio.delegate = self;
        theAudio.volume = 1.0;
        theAudio.numberOfLoops = 0;
        [theAudio play];
        soundIsPlaying = YES;

    }   
}

老实说，这就是它。当按下另一个按钮时，它将停止声音。

声音与多个按钮按下重叠

6 个答案: