需要一些帮助，有人知道为什么系统声音在iPad上不起作用而在iPhone上起作用吗？

Question

I am working on an app for kids, and I am using short audio with the AVFoundation framework and AudioServicesCreateSystemSound. The app works great with no issues on iPhone 3, 3G, 4, 4s. However it isn't working on an iPad 2 ill put the code for playing the sound with, I'm just not sure if there is an issue with it on the iPad or what, it works fine in the simulator for the iPad but not on the actual device. The code is below:

-(IBAction)soundcar {
    CFBundleRef mainBundle = CFBundleGetMainBundle();
    CFURLRef soundFileURLRef;
    soundFileURLRef = CFBundleCopyResourceURL(mainBundle, (CFStringRef) @"auto", CFSTR("wav"), NULL);

    UInt32 soundID;
    AudioServicesCreateSystemSoundID(soundFileURLRef, &soundID);
    AudioServicesPlaySystemSound(soundID);
}

anyone know what I can do to fix, it would be great or if it may be just an issue with the iPad itself I'm not sure. Anything that helps is appreciated.

Answer 1

Stupid question I know, but the volume is not down on the device is it? You'd be amazed how many times we see this....

Answer 2

我发现问题出在iPad和iPod上，铃声和警报音量默认设置为低设置，调高此音量可修复createSystemSound的音频音量输出。