I have created a object MFMailComposeViewController for displaying the mail composer, it working on all 32bit devices but when I run it on iPhone5s it just displayed and dismisses automatically showing error,
Unbalanced calls to begin/end appearance transitions for < UITabBarController: 0xcc7f8f0>.
There is tabbar controller that is root of window and I am trying present the mail view on self.
I have tried everything but not able to findout why its not working on iPhone5s.Let me know if anyone also faces the same issue?
I had the same issue, and the solution I found was to remove the following UIAppearance setting that I had:
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0.0, -1.0) forBarMetrics:UIBarMetricsDefault];
Hope that helps!
-Stephen
"The unbalanced calls to begin/end appearance transitions"
occurs when you try and display a new viewcontroller before the current view controller is finished displaying. You can reproduce it by navigating in viewWillAppear.
Basically you are trying to push/present two view controllers onto the stack at almost the same time.
Related
I have an iOS app where the main screen is a UICollectionViewController. When selecting an Item from the collection view the view is pushed to a detail view of the item. In the detail view I built a drawer/slider that moves out from the side. In order to get the view to look the way I wanted I hid the default navigation bar and inserted one via storyboards.
I ran into an issue that when hiding the default navigation bar you lose the back button functionality that comes with using a navigation controller. I worked around this by adding a button where the back button would have been (the image above is shown without the button). Now I use the line of code below to move back to the collection view.
[self.navigationController popToRootViewControllerAnimated:YES];
It works the way I want it except that I lose my Navigation Bar when I return to the collection view. Does anyone have any thoughts on how to fix this? Thanks in advance!
In viewWillAppear of your rootViewControler
-(void)viewWillAppear:(BOOL)animated{
[self.navigationController setNavigationBarHidden:NO];
}
I know this thread it's a little dated (more than dated more like an archive). But I ran into the same issue in swift 5, Xcode 13. Below is the swift code that I used in my viewWillAppear in case it helps someone.
self.navigationController?.setNavigationBarHidden(false , animated: true)
I seem to remember sometime back reading that changing the appearance of the mail composer view controller was not allowed. However, I also just tried for the first time to implement changes to my navigation bars system wide using the
[[UINavigationBar appearance] setBackgroundImage
method
This changes the navigation bar in the mail composer view controller. So, is this now allowed to make changes? Reason I am doing the appearance call is I have a lot of navigation bars and would like to get them all set at once.
The appearance methods are documented and their effects are intended to be app-wide, so I see no reason why it would be a problem to use them.
I wasn't lucky with searching for this, so here we go ;)
I have a UIViewController with a custom UINavigationBar which pushes another UIViewController as subview.
Everything works fine except when I click the back button on the subview. The previews (first) view appears correctly, but not animated. The animation of the UINavigationBar is correct, only the views switch immediately.
The function - (void)viewWillAppear:(BOOL)animated of the first UIViewController gets called with NO for animated. This only happens when I test with iOS 5, not with iOS 4.
Does anyone know how to fix this?
Thanks for your help! Hannes
UPDATE 1
I just removed all custom code and just used the plain UINavigationBar (so no extra settings) and it still doesn't work with iOS 5. This is my code I use in the first ViewController to push the second ViewController:
[self.navigationController pushViewController:secondViewController animated:YES];
As I already mentioned - when I click the back button in the navigation bar on the second view the first view appears immediately without animation.
Any help would be appreciated! Thanks!
UPDATE 2
I feel like I'm getting closer to the issue, but still no solution:
I just added a custom UINavigationController where I just call [super popViewControllerAnimated:animated]. This get's called correctly (animated is YES) but the viewWillAppear of the first UIViewController gets NO as value for animated...
I was having a similar problem today where the UIViewController was getting NO in viewWillAppear, except with the standard UINavigationBar and UINavigationController.
It turned out to be due to manually calling viewWillAppear:YES somewhere it shouldn't have been. This item suggests that it can also be caused by calling the wrong super method somewhere (e.g. [super viewWillAppear:animated] instead of [super viewDidAppear:animated] inside of viewDidAppear).
As for using a custom UINavigationBar, I ran across this link today that may help your case: http://sloshire1.posterous.com/simple-fix-for-viewwillappear-in-ios5
Apple implemented official ways to create custom navigation bars in iOS 5. Unfortunately, they also broke most of the non-official ways of doing it in iOS 4. iOS 5 won't call drawRect for you anymore. You need to have two ways of doing it, one for iOS 5 and greater, using the new calls, and one for iOS 4 and earlier, using the old calls. Check out the documentation for custom navigation bars in iOS 5 for more info.
Did you try to remove all your custom code and go with the native navigation bar? Does the behavior stay the same? This way you can check if your custom bar messes with the transition.
I am having the following problem while adding a subview to navigation controller. I even have tried to modify the Y location of frame before and after adding the subview but not effective.
Also tried to put a status bar on the child view but nothing is working.
Many Thanks.
You have a problem with a fullScreen IB checkbox or a fullscreen property set programmaticaly. Don't you call somewhere something like viewController.setStatusBarVisible = NO. Check it, I had the same problem.
EDIT : Does those questions / anwers help ?
iPhone - ModalViewController not raising to top of the screen
iPhone - displaying NavigationBar on a fullscreen modalView makes it go down with transparent space on top
Thank you very much everyone of you. I don't know what was the issue but instead of adding subview now I am using pushViewController and I am pushing the viewcontroller to the parent navigation controller. This solved the issue.
Thank you all of you once again.
I have a UIViewController that is pushed onto a UINavigationController and is currently displayed. When I go to start some asynchronous task inside the view controller, I can set hidesBackButton on self.navigationItem to YES, and the back button is hidden correctly.
As soon as the task is finished, and I set hidesBackButton back to NO (on the UI thread, I might add, I've made sure of this), nothing happens. The back button remains hidden.
Has anyone seen this before? What drives me especially crazy is that in my application (the same application), in a different UINavigationController hierarchy, the exact same code works correctly!
Are you calling hidesBackButton = NO from a thread? All UI operations should be done on the main thread, otherwise they won't have any effect.
i have not been able to replicate your problem on my machine. however, i faced a similar issue with tableviews even when i was updating my ui on the main thread. but calling setNeedsDisplay fixed that issue.
Can you try this and see if this works:
[self.navigationController.navigationBar setNeedsDisplay];
I guess this should work, you need to do the same, BUT ON THE NAVIGATIONBAR instead. please let me know if this worked - as i cannot test my solution because i never get this problem :-)
Have you tried forcing the view to refresh by calling setNeedsDisplay?
Maybe the OS is not picking up the changes instantly and you need to force it.
Have you tried using the setHidesBackButton:animated: method instead? Perhaps that has a slightly different behavior.
In my case I simply had to give a title to the view, as in:
self.navigationItem.title = #"Menu";
Marinus
I have had a similar issue recently. I tried literally everything I found in SO and other forums- nothing worked.
In my case there was a modally shown UINavigationController with a simple root controller which would push one of two view controllers (A and B) on top of the controller stack when the button A or B was pressed, respectively. Controller B was the one which was not supposed to show the back button. But still, sometimes it did, sometimes it didn't.
After hours of debugging, I managed to track it down. Controller A was a UITableViewController. Each time I selected a cell in this controller, the delegate would pop Controller A off the stack. BUT. I made use of a UISearchDisplayController as well. Turned out that popping the view while the search controller was still active messed up something in the navigation controller that made it impossible to hide the back button in Controller B afterwards (well, it eventually stayed hidden between viewDidLoad and viewDidAppear: but then it always turned visible).
So the solution (rather workaround) was adding this line to where Controller A was dismissed:
controllerA.searchDisplayController.active = NO;
// ...
// [self.navigationController popViewControllerAnimated:YES];
Hope this spares someone a couple of hours.