Question

Want to pause the multiple views from updating when Pause button is pressed

In h file

@property BOOL appIsPaused;

In m file

@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];
}

and it goes on like this for multiple views.

Any ideas how to pause views from updating whenever pause button is pressed.

Answer 1

Instead of using performSelector after delay, you should consider using a NSTimer.

Like this:

Declare a NSTimer *timer ivar.
Declare a NSUInteger viewControl;

Set viewControl to 0;

On the play part of the method add this line:

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;
    }
}

And add this line on pause action:

[timer invalidate]

It is also cleaner and let you have more control over your code.

Hope it helps.