相关疑难解决方法(0)

我试图通过iPhone上的AVAudioPlayer播放(非常短 - 少于2秒)的音频文件来消除启动延迟.

一,代码:

NSString *audioFile = [NSString stringWithFormat:@"%@/%@.caf", [[NSBundle mainBundle] resourcePath], @"audiofile"];
NSData *audioData = [NSData dataWithContentsOfMappedFile:audioFile];

NSError *err;
AVAudioPlayer *audioPlayer = [(AVAudioPlayer*)[AVAudioPlayer alloc] initWithData:audioData error:&err];

audioPlayer.delegate = self;
[audioPlayer play];

一旦完成,我还实现了audioPlayerDidFinishPlaying方法来释放AVAudioPlayer.

我第一次播放音频时滞后是显而易见的 - 至少2秒.然而,之后立即播放声音.我怀疑那个罪魁祸首是[NSData dataWithContentsOfMappedFile]最初从闪存中读取了很长时间,但后来读取速度很快.不过,我不确定如何测试.

是这样的吗？如果是这样,我是否应该预先缓存NSData对象并积极地在低内存条件下清除它们？

我正在使用SKTAudioRay Wenderlich在他的Github上提供的库.这是我为播放声音效果而修改的代码,我每次播放时都会调用它:

public func playSoundEffect(_ filename: String) {
    let url = Bundle.main.url(forResource: filename, withExtension: nil)
    if (url == nil) {
        print("Could not find file: \(filename)")
        return
    }
    if !UserDefaults.standard.bool(forKey: "soundOff"){
    var error: NSError? = nil
    do {
        soundEffectPlayer = try AVAudioPlayer(contentsOf: url!)
    } catch let error1 as NSError {
        error = error1
        soundEffectPlayer = nil
    }
    if let player = soundEffectPlayer {
        DispatchQueue.global(qos: .background).async {
            player.numberOfLoops = 0
            player.prepareToPlay()
            player.play()
        }
    } else {
        print("Could not create audio …

-(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.