CODEWITHSUNDEEP
iosobjective-ciphoneipaduinavigationcontroller
TechChain
TechChain

Reputation: 8944

How to detect which child view controller was popped up in iOS?

I have view controller say A i am going from A to B.Then on B by pressing back button i am coming to A.Now i want to know from which view controller i am coming back.Please tell me how can i do this.I know i can do it by using viewWillAppear method but don't want to use this.

Please tell which is the best way of doing it?

-(void)viewWillAppear:(BOOL)animated
{
    NSLog(@"view will appear called");
}

Upvotes: 1

Views: 1427

Answers (4)

TechChain
TechChain

Reputation: 8944

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                  toViewController:(UIViewController *)toVC
{
    NSLog(@"from VC class %@", [fromVC class]);
    if ([fromVC isKindOfClass:[ControllerYouJustPopped class]])
    {
        NSLog(@"Returning from popped controller");

    }

    return nil;
}

This really saved me .

Upvotes: 1

gauchomat
gauchomat

Reputation: 59

You could use a navigation controller delegate and implement the following UINavigationControllerDelegate method:


- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    UIViewController *fromViewController = [navigationController.transitionCoordinator viewControllerForKey:UITransitionContextFromViewControllerKey];
    NSLog(@"%@", fromViewController.title);
}

Upvotes: -1

WhyMe
WhyMe

Reputation: 33

you can pass id of controller before pop
A.h
@property NSInteger childVC;
A.m 

-(void)viewWillAppear:(BOOL)animated
{
    if (_childVC == 3){
        //todo
    }
}

B.m 

-(void) viewWillDisappear:(BOOL)animated {
    A *parent = (A *)self.navigationController.viewControllers[self.navigationController.viewControllers.count - 2];
    parent.childVC = 3;
    [super viewWillDisappear:animated];
}

I do not see other ways

Upvotes: 0

user4913266
user4913266

Reputation:

You have been push to B-VC from A-VC right.You can come back by popping.

self.navigationController!.popViewControllerAnimated(true)--Write this code in B-VC

VC-ViewController.

Upvotes: 1

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