獲取從另一個類訪問創建類對象

Question

ViewController1.h

@interface ViewController : UIViewController 
@property AVAudioPlayer *audioPlayer; 
@end 

ViewController1.m

@synthesize audioPlayer; 
... 
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; 
[audioPlayer play]; 

我怎樣才能阻止類ViewController2方法的音樂嗎？

Answer 1

使用NSNotification：

將這個當用戶點擊ViewController2停止音樂：

[[NSNotificationCenter defaultCenter] postNotificationName:@"stopMusic" object:nil]; 

和ViewController1應該有這樣的：

-(void)viewDidLoad: 
{ 
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(stopTheMusic:) name:@"stopMusic" object:nil]; 
} 

-(IBAction)stopTheMusic:(id)sender { 
     [audioPlayer stop]; 
} 

祝您好運！