ios - 再次播放文件时调用AVAudioPlayer audioPlayerDidFinishPlaying

Question

我正在使用AVAudioPlayer类播放音频，但是问题是，当我播放音频时，即使文件播放完并且即使将循环数设置为1，也无法在audioPlayerDidFinishPlaying中收到回调。

这是代码。

.h

@interface AudioController : NSObject <AVAudioPlayerDelegate>

-(void) playBigGameTheme{
-(void) playMusic:(NSString*) fileName isLooping: (BOOL) isLooping;
@end

.m

@implementation AudioController{

    AVAudioPlayer *audioPlayer;
}

-(void) playMusic:(NSString*) fileName isLooping: (BOOL) isLooping{

    int loop = 1;
    if(isLooping){
        loop = -1;
    }

    [audioPlayer stop];
    NSURL* soundUrl = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:fileName  ofType:@"mp3"]];
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
    audioPlayer.numberOfLoops = loop;
    [audioPlayer setDelegate:self];
    NSLog(@"===Number of loops : %d", audioPlayer.numberOfLoops);    
    [audioPlayer play];
}

- (void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
    NSLog(@"HERE");
}

-(void) playBigGameTheme{
    [self playMusic:BGAME_MAIN_MUSIC_FILE_NAME isLooping:NO];
}
@end

当我调用playBigGameTheme时，音频开始正确播放。但是它会在声音结束时重新启动，并且在第二次音频结束时重新启动，然后仅调用audioPlayerDidFinishPlaying方法。

我被困住了，不知道出了什么问题。

Answer 1

even when the number of loops is set to 1

这就是原因。此属性的名称和行为有点违反直觉，但是如果您阅读了文档，则很显然，它设置的是 重复次数，而不是 播放次数。 从 docs引用:

The value of 0, which is the default, means to play the sound once.

因此，将其设置为0(或不设置，默认值为零)，它将只播放一次音频文件:

audioPlayer.numberOfLoops = 0;