Stop NSTimer running from application didFinishLaunchingWithOptions - iphone

Question

I have start a timer to call a method after 10 seconds. the timer start from didFinishLaunchingWithOptions. it works fine but I want to stop that timer from another UISubclass at the time of logout. How I can do this my code is
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[NSThread sleepForTimeInterval:2.0];
[self.window addSubview:viewController.view];
[self setupTimer];
[self.window makeKeyAndVisible];
return YES;
}
-(void)setupTimer;
{
timer = [NSTimer timerWithTimeInterval:10
target:self
selector:#selector(triggerTimer:)
userInfo:nil
repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}
-(void)triggerTimer:(NSTimer*)timer;
{
NSLog(#"===============this method is call after every 10 second===========================");
Getlocation *object=[[Getlocation alloc] init];
[object updatelocation];
}
-(void)stopTimer:(NSTimer*)timer;
{
[timer invalidate];
timer=nil;
}

Answer 1

if([timer isValid])
[timer invalidate];
timer = nil;

Answer 2

Take an object of NSTimer.
Write this line where do you want to call method
timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(NEWTIMER) userInfo:nil repeats:YES];
Write this code there do you want stop timer.
[timer invalidate];
timer = nil;
[timer release];
if you want stop timer when your app came background .you should write this code into this method.
- (void)applicationWillEnterForeground:(UIApplication *)application
{
[timer invalidate];
timer = nil;
[timer release];
}

Answer 3

Write code in logout ButtonAction method.
-(IBAction)LogOutButtonPressed:(id)sender {
[timer invalidate]; timer = nil; [timer release];
}