暫停從更新

Question

視圖想從當暫停按鈕被按下

以h文件更新暫停多個視圖

@property BOOL appIsPaused; 

在米文件

@synthesize appIsPaused; 

-(void)playpauseAction:(id)sender 
{ 

if 

    ([audioPlayer isPlaying]){ 

[sender setImage:[UIImage imageNamed:@"play.png"] forState:UIControlStateSelected]; 

     [audioPlayer pause]; 

     appIsPaused = YES; 

    } else { 

[sender setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal]; 

     [audioPlayer play]; 

     appIsPaused = NO; 

     [self performSelector:@selector(displayviewsAction:) withObject:nil afterDelay:11.0]; 

    } 

} 

- (void)displayviewsAction:(id)sender 
{ 
FirstViewController *viewController = [[FirstViewController alloc] init]; 

viewController.view.frame = CGRectMake(0, 0, 320, 480); 

[self.view addSubview:viewController.view]; 

[self.view addSubview:toolbar]; 

[self performSelector:@selector(secondViewController) withObject:nil afterDelay:23]; 

[viewController release]; 

} 

-(void)secondViewController { 
SecondViewController *secondController = [[SecondViewController alloc] init]; 

secondController.view.frame = CGRectMake(0, 0, 320, 480); 

[self.view addSubview:secondController.view]; 

[self.view addSubview:toolbar]; 

[self performSelector:@selector(ThirdviewController) withObject:nil afterDelay:27]; 

[secondController release]; 
} 

和它繼續像這爲多個意見。

任何想法如何暫停視圖從暫停按鈕被按下時更新。

Answer 1

而不是在延遲後使用performSelector，你應該考慮使用NSTimer。

想要這樣：

聲明NSTimer *計時器伊娃。 聲明一個NSUInteger viewControl;

將viewControl設置爲0;

在方法的播放部分加入這一行：

timer = [NSTimer scheduledTimerWithTimeInterval:11 target:self selector:@selector(tick) userInfo:nil repeats:YES]; 

-(void)tick 
{ 
    switch(viewControl) 
    { 
     case 0: 
      [self performSelector:@selector(firstViewController) withObject:nil]; 
      break; 
     case 1: 
      [self performSelector:@selector(secondViewController) withObject:nil]; 
      break; 
     case 2: 
      [self performSelector:@selector(thirdViewController) withObject:nil]; 
      break; 
     . 
     . 
     . 
     default: 
      break; 
    } 

    viewControl++; 

    if(viewControl > MAX_VIEWS) 
    { 
     viewControl = 0; 
    } 
} 

，並添加暫停行動這一行：

[timer invalidate] 

它也更清潔，讓你在你的代碼的控制。

希望它有幫助。