CODEWITHSUNDEEP
iosobjective-cuinavigationcontrollerautolayout
Rajesh Choudhary
Rajesh Choudhary

Reputation: 1340

Pushing viewController from viewWillAppear

I am trying to push a UIViewController (Called A) from viewWillAppear OR viewDidAppear of ViewController (Called B). Which is working fine.

But when I am popping A... B doesn't push it(A) again (Or I can say It is not showing its view) ... But when I am trying same after disable AutoLayout for my Storyboard, It is pushing A again after popping.

I have 3 solutions to resolve this issue... But I don't know why this is happening. Any one please update me about this issue. Thanks in advance.

When Auto Layout is enabled:

                      (ViewDidAppear)   
rootViewController —————————————————————> demoViewController
                    (Push: animation:NO)


                       (Button Press)   
demoViewController —————————————————————> rootViewController
                    (Pop: animation:NO)

As per code, rootViewController will push again demoViewController, But it is not showing demoViewController and navigationController is having demoViewController in its stack.

When Auto Layout is disabled:

Everything is working as we are assuming.

Upvotes: 1

Views: 1422

Answers (3)

Radu Simionescu
Radu Simionescu

Reputation: 4695

See the answer given in this question: Pushing view controller within viewDidAppear doesn't work

In my situation what you are describing was happening with auto layout disabled. This helped

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 250 * USEC_PER_SEC), dispatch_get_main_queue(), ^{
    [self.navigationController pushViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"myScreen"] animated:YES];
});

Upvotes: 2

Plokstorm
Plokstorm

Reputation: 27

You musn't push a view Controller into another in viewDidAppear or viewWillAppear. Because after you have to set variables when you want to come back...

Have you set constraints in your storyboard ? Because it can become from it.

Upvotes: 0

Bikram Thapa
Bikram Thapa

Reputation: 1339

I don't know what view (and of what size) you have defined in the IB or in your code. Developers must have the through knowledge about using the AutoLayout feature in IB otherwise it leads to very nasty (unanticipated) bugs in the code.

So, i strongly recommend to go through this AutoLayout Guide: here I guess the contraints in views of viewcontroller A is giving the bug.

More precisely go to this page: Working with Constraints in Interface Builder

So, without trying couldbe or shouldbe be clear from this link.

Upvotes: 0

Related Questions