此问题已在SO上显示在其他几个问题中:
Slow start for AVAudioPlayer the first time a sound is played
Delay in playing sounds using AVAudioPlayer
我尝试过实施修正建议,但没有一个能解决我的问题。我的应用程序向用户呈现要触摸的对象网格,当触摸对象时播放声音。这很有效,除了在初始触摸时有延迟~2秒。
为了解决这个问题,我用虚拟的aiff文件初始化我的音频播放器:
- (void)viewDidLoad{
NSString *soundFile = [Card loadCardSoundPath:@"dummy"];
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:
[NSURL fileURLWithPath:soundFile] error:nil];
self.audioPlayer = player;
[audioPlayer setDelegate:self];
[audioPlayer prepareToPlay];
// [audioPlayer play];
[player release];
...
[super viewDidLoad];
}
然后当触摸一个物体时,我打电话给:
NSString *soundFile = [Card loadCardSoundPath:name];
if (soundFile != nil){
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:
[NSURL fileURLWithPath:soundFile] error:nil];
self.audioPlayer = player;
[self.audioPlayer setDelegate:self];
[self.audioPlayer prepareToPlay];
[self.audioPlayer play];
[player release];
}
我正在观察的行为是这样的:当我创建一个虚拟音频播放器并调用prepareToPlay但没有播放时,我会在单击第一个对象时观察音频延迟。但是,如果我在虚拟音频播放器上调用播放,那么我不会在初始对象上获得延迟,但视图加载会延迟2秒。
有没有办法解决这个问题?我是否应该在加载时简单地创建一个AVAudioPlayers的NSArray并告诉他们所有人准备播放,然后在单击该对象时调用play?
答案 0 :(得分:4)
有时通过假设使用viewDidLoad
进行初始化来让peformSelector:withObject:afterDelay:
返回是有帮助的。例如:
- (void)viewDidLoad{
// initialization ...
[super viewDidLoad];
[self performSelector:@selector(primeAudioPlayer) withObject:nil afterDelay:0.1];
}
-(void)primeAudioPlayer {
NSString *soundFile = [Card loadCardSoundPath:@"dummy"];
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:
[NSURL fileURLWithPath:soundFile] error:nil];
[audioPlayer prepareToPlay];
[player release];
}