SpriteKit：在播放之前将声音文件预加载到内存中？ [英] SpriteKit: Preload sound file into memory before playing?

问题描述

只是想知道这是否可行。目前，我第一次在应用程序运行时播放声音文件时，在声音实际播放之前会有明显的延迟（比如它正在缓存它或其他东西）。在此之后它立即播放没有问题，但如果我完全关闭应用程序并重新启动它，延迟将在第一次播放声音时返回。以下是我用来播放声音的代码：

  [self runAction：[SKAction playSoundFileNamed：@mySound.caf waitForCompletion：NO]]; 
  

解决方案

您可以采取的一种方法是加载声音就在场景的开头：

YourScene.h：

  @interface YourScene：SKScene 
 @property（强大，非原子）SKAction * yourSoundAction; 
 @end 
  

YourScene.m：

'pre> - （无效）didMoveToView：（SKView *）yourView
{
_yourSoundAction = [SKAction playSoundFileNamed：@ yourSoundFile waitForCompletion：NO];
//你的初始代码的剩余部分
//可能将它包装在支票中，以确保场景只发起一次......
}


这应该预加载声音，你应该可以通过调用场景中的动作来运行声音：

  [self runAction：_yourSoundAction]; 
  

我自己在有限的情况下尝试了这个，它似乎摆脱了延迟。 / p>

Just wondering if this is possible. Currently, the first time I play a sound file while the app is running, there is a noticeable delay before the sound actually plays (like it's caching it or something). After this it plays instantly without issue, but if I close the app completely and relaunch it, the delay will be back the first time the sound is played. Here is the code I'm using to play the sound:

[self runAction:[SKAction playSoundFileNamed:@"mySound.caf" waitForCompletion:NO]];

解决方案

One approach you could take is to load the sound in right at the beginning of the scene:

YourScene.h:

@interface YourScene : SKScene
@property (strong, nonatomic) SKAction *yourSoundAction;
@end

YourScene.m:

- (void)didMoveToView: (SKView *) yourView
{
    _yourSoundAction = [SKAction playSoundFileNamed:@"yourSoundFile" waitForCompletion:NO];
    // the rest of your init code
    // possibly wrap this in a check to make sure the scene's only initiated once...
}

This should preload the sound, and you should be able to run it by calling the action on your scene:

[self runAction:_yourSoundAction];

I've tried this myself in a limited scenario and it appears to get rid of the delay.

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