title: How to stop NSTimer
body: <p>Hey so i am just making an example application and i am having a little trouble, So i have a table view and then i have a few rows and when a user clicks a row it takes them to a new view. On this view i have a button to play music. I am using a timer to make a slider bar increase based on music duration and remaining time.</p>
  
  <p>Now my problem is, what do i have to put so that when i go back to the table view via the top left button, that the NSTimer stops?</p>
  
  <p>this is what i have so far, i cannot get a repeat: YES timer to stop.</p>
  
  <pre><code>#import "SecondViewController.h"
  
  @implementation SecondViewController
  @synthesize lbl1;
  @synthesize timer;
  
  -(IBAction) slide {
   myMusic.currentTime = slider.value;
  }
  
  -(IBAction)play
  {
  timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime) userInfo:nil repeats:YES];
   slider.maximumValue = [myMusic duration];
   myMusic.volume = 0.2;
   [myMusic prepareToPlay];
   [myMusic play];
  }
  
  -(IBAction)pause
  {
   [myMusic pause];
  }
  
  -(IBAction)stop
  {
   slider.value = 0;
   myMusic.currentTime = 0;
   [myMusic stop];
  }
  
  - (void)updateTime{
    slider.value = myMusic.currentTime;
  }
  
  // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
  - (void)viewDidLoad {
  
    //This plays music, we must give it a path to find the file and then u can change it. 
   NSString * pathToMusicFile = [[NSBundle mainBundle] pathForResource:@"Katy" ofType:@"mp3"];
       myMusic = [[ AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:pathToMusicFile] error:NULL];
       myMusic.delegate = self;
       myMusic.numberOfLoops = -1;
  
   slider.value = 0;
   //[myMusic play];
  
      [super viewDidLoad];
  }
  
  
  - (void)viewDidUnload {
  
   [timer invalidate];
   timer = nil;
   //myMusic.currentTime = 0;
   [myMusic stop];
   [super viewDidUnload];
  
   // Release any retained subviews of the main view.
   // e.g. self.myOutlet = nil;
  }
  
  -(IBAction) TxtChange;{
  
   lbl1.text = @" test2! I CHNAGED TEXT FROM ANOTHER XIB";
  }
  
  - (void)dealloc {
   [timer invalidate];
   timer = nil; 
   [myMusic release];
      [super dealloc];
  }
  
  @end
  </code></pre>