以下代码给出了Sending'ViewController*const__strong'toparameterofincompatibletype'id'的警告(就是下面代码中的第三行):NSURL*sound0URL=[NSURLfileURLWithPath:[[NSBundlemainBundle]pathForResource:@"0"ofType:@"aiff"]];audioPlayer0=[[AVAudioPlayeralloc]initWithContentsOfURL:sound0URLerror:nil];[audioPlayer0setDelegate:self]