CODEWITHSUNDEEP
iphoneobjective-ciosios5nstimer
user793789
user793789

Reputation: 196

Terminating NSTimer when navigating away from one view controller

I just happened to realize that NSTimer is still firing when i'm navigating away from a ViewController like pressing back button. What is the appropriate way to terminate that particular NSTimer?

Upvotes: 0

Views: 2269

Answers (4)

iLearner
iLearner

Reputation: 1680

This is what I understood from your question:

That You want to invalidate timer while going to another ViewController right?

So try this:

YourViewController *objController = [[YourViewController alloc] initWithNibName:@"YourViewController" bundle:nil];
[self.navigationController pushViewController:objController animated:YES];
[timer invalidate]; //your timer object goes here

EDIT:

or if you are Popping Up the ViewConrtoller/ Dismissing viewContoller, then put

[timer invalidate];

afer that block of code.

Upvotes: 0

TheTiger
TheTiger

Reputation: 13354

You can use this method for terminate your NSTimer- 

[timer invalidate]; //timer is your NSTimer

You can invalidate your timer like this -

1. Method

-(void)viewWillDisappear:(BOOL)animated
{
    [timer invalidate];
}

2. Method

-(void)viewDidDisappear:(BOOL)animated
{
    [timer invalidate];
}

Upvotes: 0

Alex Markman
Alex Markman

Reputation: 1460

I would suggest you to make custom navigationcontroller class using which you can have an event while poping viewcontroller.

#import "customNavigationController.h"
#import "SettingsTableController.h"

@implementation customNavigationController

- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
    if([[self.viewControllers lastObject] class] == [SettingsTableController class]){
        [[(SettingsTableController *)[self.viewControllers lastObject] timer] invalidate];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration: 1.00];
        [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
                    forView:self.view cache:NO];

        UIViewController *viewController = [super popViewControllerAnimated:NO];

        [UIView commitAnimations];

        return viewController;
    } else {
        return [super popViewControllerAnimated:animated];
    }
}
@end

here, SettingsTableController is the class which is having NSTimer , so u can invalidate your timer. This will help not to invalidate timer while presenting any modalview or even pushing a view controller.

more details http://www.hanspinckaers.com/custom-action-on-back-button-uinavigationcontroller

Upvotes: 0

Aapo Kyrola
Aapo Kyrola

Reputation: 1120

You can handle it in the viewDidDisappear event:

-(void)viewDidDisappear:(BOOL)animated {
    [myTimer invalidate];
}

Upvotes: 4

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