如何创建SystemSoundID数组

时间:2010-07-10 17:41:27

标签: iphone objective-c xcode

我似乎无法弄明白。

我可以播放一个声音:

- (void) initSounds {
    // Get the main bundle for the app
    CFBundleRef mainBundle;
    mainBundle = CFBundleGetMainBundle ();
    // Get the URL to the sound file to play
    soundFileURLRef  =  CFBundleCopyResourceURL (mainBundle,CFSTR ("1"),CFSTR ("wav"),NULL);

    // Create a system sound object representing the sound file
    AudioServicesCreateSystemSoundID (soundFileURLRef, &soundFileObject);
}

-(void) play {
    AudioServicesPlaySystemSound(self.soundFileObject);
}

但我想创建一个SystemSoundID对象数组。当我尝试这样做时,我不断收到错误。有人能告诉我创建soundFileObjects数组的代码以及我如何在AudioServicesPlaySystemSound中使用该数组吗?

1 个答案:

答案 0 :(得分:7)

SystemSoundID是一个完整的非类类型,所以你需要使用像NSNumber这样的包装器将它存储在像NSArray这样的Cocoa容器中:

// assuming this property:
@property (copy) NSArray *soundFileObjects;

// creating the array:
soundFileObjects = [[NSArray alloc] initWithObjects:
                     [NSNumber numberWithUnsignedLong:soundId],
                     // more ?
                     nil];

// using it, e.g.:
SystemSoundID sid = [[self.soundFileObjects objectAtIndex:0] unsignedLongValue];
AudioServicesPlaySystemSound(sid);