使用AVAudioPlayer延迟播放声音

Question

-(IBAction)playSound{ AVAudioPlayer *myExampleSound;

NSString *myExamplePath = [[NSBundle mainBundle] pathForResource:@"myaudiofile" ofType:@"caf"];

myExampleSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:myExamplePath] error:NULL];

myExampleSound.delegate = self;

[myExampleSound play];

}

我想在点击按钮时发出哔哔声.我使用了上面的代码.但播放声音需要一些延迟.

有人请帮忙.

Answer 1

延迟有两个来源.第一个更大,可以使用prepareToPlay方法消除AVAudioPlayer.这意味着您必须声明myExampleSound为类变量并在需要它之前将其初始化一段时间(当然还要调用prepareToPlay初始化后):

- (void) viewDidLoadOrSomethingLikeThat
{
    NSString *myExamplePath = [[NSBundle mainBundle]
        pathForResource:@"myaudiofile" ofType:@"caf"];
    myExampleSound =[[AVAudioPlayer alloc] initWithContentsOfURL:
        [NSURL fileURLWithPath:myExamplePath] error:NULL];
    myExampleSound.delegate = self;
    [myExampleSound prepareToPlay];
}

- (IBAction) playSound {
    [myExampleSound play];
}

这应该延迟到大约20毫秒,这可能适合您的需要.如果没有,你将不得不放弃AVAudioPlayer并切换到播放声音的其他方式(如Finch声音引擎).

另请参阅我自己关于AVAudioPlayer滞后的问题.