播放两次 NSSound

Question

我想播放 NSSound 两次，除了短于 10 秒，然后我想等到 10 秒完成，然后再开始第二次。

但是我在播放同一个 NSSound 两次时遇到了问题。

NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"MessageArrived" ofType:@"wav"];
NSSound *sound = [[NSSound alloc] initWithContentsOfFile:resourcePath byReference:YES];
[sound play] //It plays the fist time
[sound play] //I get the following Error and it doesn't play a secont time
/*malloc: *** auto malloc[498]: error: GC operation on unregistered thread. Thread registered implicitly. Break on auto_zone_thread_registration_error() to debug.*/

谁能告诉我这个错误的原因是什么？ 我该如何处理？

我还有其他方法吗？

Answer 1

所以经过大量搜索并尝试修复它后，我找到了解决问题的方法...

NSSound *sound = [NSSound soundNamed:@"MessageArrived"];
BOOL res = [sound play];
NSLog(@"%d", res);
[NSThread detachNewThreadSelector:@selector(playSecondSound:) toTarget:self withObject:sound];

-(void)playSecondSound:(NSSound*)sound
{
    [NSThread sleepForTimeInterval:10-[sound duration]];
    [sound stop];
    BOOL res = [sound play];
    NSLog(@"%d", res);
}

我发现即使声音已经结束，我也必须在开始第二个之前调用 [sound stop]。

Answer 2

当你调用第二次播放方法时声音已经在播放，显然垃圾回收中的一个错误，因为第二次播放应该被忽略，但这不会是你想要实现的问题。

NSString *resourcePath = [[NSBundle mainBundle] pathForResource:@"MessageArrived" ofType:@"wav"];
NSSound *sound = [[NSSound alloc] initWithContentsOfFile:resourcePath byReference:YES];
[sound play];

//Will play the second time after 10.0 seconds have passed.
NSInteger wait = ([sound duration] < 10.0) ? 10.0 - [sound duration] : 0.0; 
[sound performSelector:@selector(play) withObject:nil afterDelay:wait];