连接UISwitch与事件在其他视图控制器

Question

我有2视图控制器的第一个是主视图控制器，并将运行音乐时，视图控制器加载和其他视图控制器是设置内容的UISwitch所以我想要的是当用户去设置视图控制器，并打开关掉那么音乐将在主视图 停在这里是代码

main.h

#import<AVFoundation/AVAudioPlayer.h> 

@interface main : UIViewController 
{ 

AVAudioPlayer *audioPlayer; 
BOOL didInitialize; 

}

的main.m

static BOOL didInitialize = NO; 
if (didInitialize == YES) 
return; 
didInitialize = YES; 
//Add Audio Sound to the current View Controller 
NSURL *url = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/MLGBoxSoundTrack.mp3", [[NSBundle mainBundle] resourcePath]]]; 

NSError *error; 
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 
audioPlayer.numberOfLoops = -1; // -1 for looping forever 

// audioPlayer.volume = 0.5; // 0.0 - no volume; 1.0 full volume 
// NSLog(@"%f seconds played so far", audioPlayer.currentTime); 
// audioPlayer.currentTime = 5; // jump to the 10 second mark 
// [audioPlayer pause]; 
// [audioPlayer stop]; // Does not reset currentTime; sending play resumes 

if (audioPlayer == nil) 
{ 
    NSLog(@"No Audio Player"); 
} 
else 
{ 
    [audioPlayer play]; 
} 
//End Audio Sound 

Answer 1

Use NSNotificationCenter

首先视图控制器，用于切换通知，开关切换时第二视图控制器交通知添加观察者。