pause button when pressed again to resume reloading view controllers
<p>I am using <code>AVAudioplayer</code> to <strong>play audio files</strong>, <strong>play/pause button to toggle between play and pause</strong> and <code>NSTimer</code> with <code>audio player</code> to synchronize <code>view controllers</code> one after another. I have a total of 10 or 11 <code>view controllers</code> to load one after the other.</p>

<p>When play button is pressed the very first time it starts <code>NSTimer</code>, starts playing an <code>audio file</code> and based on <code>NSTimer</code>, view controllers will load one after the other.  When pause button is pressed again to resume it resumes everything from that point audio file, <code>NSTimer</code> and <code>view controllers</code> from the same point where it was paused which is good. However, at the same time it starts loading the <code>view controllers</code> again one after the other from the beginning based on <code>NSTimer</code> which is not good. </p>

<p>It is reloading view controllers with this statement</p>

<pre><code>self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0
                                              target:self
                                            selector:@selector(displayviewsAction:)
                                            userInfo:nil
                                             repeats:NO];
</code></pre>

<p>So my issue is that I need to stop the loading of <code>view controllers</code> again from the beginning when pause button is pressed again to resume playback.</p>

<pre><code>-(void)playpauseAction:(id)sender 
{ 
    if ([audioPlayer isPlaying]) {
        [sender setImage:[UIImage imageNamed:@"Play Icon.png"] forState:UIControlStateSelected];
        [audioPlayer pause];
        [self pauseTimer];
    } else {
        [sender setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal];
        [audioPlayer play];
        [self resumeTimer];
        self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0
                                                      target:self
                                                    selector:@selector(displayviewsAction:)
                                                    userInfo:nil
                                                     repeats:NO];
    }       
}

-(void)pauseTimer{
    pauseStart = [[NSDate dateWithTimeIntervalSinceNow:0] retain];
    previousFireDate = [[timer fireDate] retain];
    [timer setFireDate:[NSDate distantFuture]];
}

-(void)resumeTimer{
    float pauseTime = -1*[pauseStart timeIntervalSinceNow];
    [timer setFireDate:[previousFireDate initWithTimeInterval:pauseTime sinceDate:previousFireDate]];
    [pauseStart release];
    [previousFireDate release];    
}

- (void)displayviewsAction:(id)sender
{  
    First *firstController = [[First alloc] init];
    firstController.view.frame = CGRectMake(0, 0, 320, 480);
    CATransition *transitionAnimation = [CATransition animation];  
    [transitionAnimation setDuration:1];    
    [transitionAnimation setType:kCATransitionFade];    
    [transitionAnimation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn]];    
    [self.view.layer addAnimation:transitionAnimation forKey:kCATransitionFade];
    [self.view addSubview:firstController.view];
    [self.view addSubview:toolbar];
    [firstController release];   
    self.timer = [NSTimer scheduledTimerWithTimeInterval:23 target:self selector:@selector(Second) userInfo:nil repeats:NO];     
 }
</code></pre>

<p>Can anyone give an idea on how to stop the loading of <code>view controllers</code> again from the beginning when pause button is pressed again to resume playback.</p>
