I'm hiding the navigationbar on a certain view, and when the user presses a button on the view, i'm pushing it to the next view.
In the next view, I am not longer hiding the nav bar and as expected it becomes visible. When hitting back however, the navbar on the first view also becomes (somehow) visible.
I'm hiding the top navbar like this:
self.navigationController.navigationBar.hidden = YES;
And I'm making it visible like this:
self.navigationController.navigationBar.hidden = NO;
I wonder what could be wrong with this, as it's quite basic but somehow has a glitch.
In Parent VC's viewWillAppear method hide the navigation bar.
-(void)viewWillAppear:(BOOL)animated {
self.navigationController.navigationBar.hidden = YES;
}
Related
In a viewController I programmatically create a UIView that has the same height of the screen. The problem is that navigation bar is still visible and clickable, but I want it to go under the new view. How can I do that?
EDIT: this is a screenshot of what I have now
Not sure if this is what you actually want, since hiding it is a quite acceptable thing to do. However you can hide the rightButtonItem and disable the left one:
self.navigationItem.rightBarButtonItem = nil;
self.navigationItem.backBarButtonItem.enabled = NO;
And to get back your right bar button, if you need it again somewhere:
self.navigationItem.rightBarButtonItem = self.*whatever*ButtonItem;
See if that works. I'm away from my Mac at the moment, so can't check it myself.
Right now you have taken navigation controller as a root view
controller (Maybe),In this case navigation controller overlaps the
UIVewController's view that's why it comes on the view so you need to
hide the Navigation controller.
What about making it hidden?
self.navigationController.navigationBarHidden = YES;
So iOS 7 introduced this new feature that you can pop a view controller by panning on the left edge. Here is my problem: I have two view controllers, A and B, that are connected by a push segue. Both of the controllers have navigation bars (by embedding A in a navigation controller). The navigation bar in B will be hidden once the user enters B's scene, and can be shown if the user taps on the scene. If the user pans on the left edge of B while the navigation bar is hidden, the navigation bar in A will be hidden as well, which means that there is no way for the user to return further back from A. So is there a way to enforce A to always show the navigation bar regardless of B has hidden the bar or not? Or is there a easy way to prevent the pan gesture from taking effect? I read this post which suggested a way of preventing the pan, but I can't locate the property in storyboard.
EDIT: So I disabled the interactive pop gesture recognizer but that only solved half of the problem. The other half is that if I click the back button on the child view controller navigation bar when the navigation bar is disappearing, I am navigated back to the parent view controller without a navigation bar. I tried calling [self.navigationController setNavigationBarHidden:NO] in viewWillAppear and then viewDidLoad but it does not work. Is this some sort of bug in the SDK or am I missing something?
Here is the code for hiding the navigation bar in the child view controller
- (void)hideNavigationBar
{
if (self.navigationBarHidden == NO)
{
[UIView animateWithDuration:UINavigationControllerHideShowBarDuration animations:^{
self.navigationController.navigationBar.alpha = 0.0;
self.previewCollectionView.alpha = 0.0;
} completion:^(BOOL finished) {
self.navigationBarHidden = YES;
}];
}
}
Yes, you can enforce the navigation bar's appearance in the A viewController's -viewWillAppear method.
Also, since you cannot find the interactivePopGestureRecognizer property in the storyboard, you can use this line in the A viewController's -viewDidLoad method:
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
EDIT:
In the viewWillAppear method, you will have to call:
[self.navigationController setNavigationBarHidden:NO];
self.navigationController.navigationBar.alpha = 1.0;
I see a couple problems with your situation:
You disable the interactive pop gesture and you hide the nav bar from view controller B. How is the user supposed to intuitively go back?
The animation that hides your navbar in B may be causing the issue. If it's anything longer than a split second, that animation may not complete in time before you hit the back button and -viewWillAppear fires on A.
Your code in B hides the navigation bar for the navigation controller. The navigation controller that holds view controller A is the same instance that holds view controller B. If you hide the navigation bar when B loads, then you go back to A (not sure how you're doing that without a back button or a edge pan gesture), it should still be hidden.
You probably want NOT disable the gesture (so the user can intuitively go back) and turn the navigation bar back on in view controller A's -viewWillAppear, to cover the case where you turned it off in B:
if (self.navigationBarHidden == NO)
{
self.navigationController.navigationBar.alpha = 1.0;
self.previewCollectionView.alpha = 1.0;
self.navigationBarHidden = NO;
}
my app is structured as follow: UITabBarController > UINavigationController > ViewControllerOne > ViewControllerTwo.
the UINavigationBar has at the bottom the tab bar, now when the user navigates into the second view controller, i want to be able to hide the tab bar and replace is with a tool bar. i tried this code:
[self.navigationController.tabBarController.tabBar setHidden:YES];
[self.navigationController.toolbar setHidden:NO];
when i run the app the tab bar is hidden but the toolbar doesn't appear. plus, since the last VC is a table view controller, when i scroll through the cells there is a white gap between the table and the bottom of the view. how can i fix that?
That won't work because when you hide the tab bar like that the subviews won't be adjusted properly (that's why you get the white space). You'll have to use
self.hidesBottomBarWhenPushed = YES;
In your init method or awakeFromNib... and then
[self.navigationController setToolbarHidden:NO animated:YES];
In the viewDidLoad for example.
That way the tab bar controller's view is going to layout correctly it's subviews when you hide the tab bar. Just remember to call self.hidesBottomBarWhenPushed = NO; in your first view controller otherwise the tab bar is still going to be hidden when the second view controller is popped from the navigation stack.
Try to assigning toolbar with appropriate frame and adding it to self.tabBarController.view
I have a table view A which is segued to a view B.
In A, there is a nav bar on the top, and below is the table.
When I press a row in A's table, B is pushed.
In B's viewWillAppear, I have the following code.
-(void)viewWillAppear:(BOOL)animated
{
self.wantsFullScreenLayout = YES;
[self.navigationController.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.barStyle = UIBarStyleBlackTranslucent;
}
This makes extends the view so that below the status bar, I have Nav bar and the UIView overlapped.
I also have viewWillDisappear
-(void)viewWillDisappear:(BOOL)animated
{
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
// back button was pressed. We know this is true because self is no longer in the navigation stack.
self.wantsFullScreenLayout = NO;
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:#"navigationbar_bg.png"] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.translucent = NO;
}
}
So when the user press back button, it will undo the fullscreen mode so that the view and nav bar won't overlap. THE ISSUE IS, when I press back button and the previous screen A is shown, strangely the table view still appears overlapped with the nav bar.
I even tried to put self.wantsFullScreenLayout = NO in A's willViewAppear but to no avail.
Shouldn't A shrink the tableview and be located under Nav bar? Can anyone let me know what is worng and how to solve this issue?
Thanks in advance!
Instead of putting the code in viewWillDisappear method, try to put the same code in the viewWillAppear method of the previous view controller.
I have a navigation controller where I add a toolbar based on user input.
When the user hits back to the home screen. I don't want the toolbar.
self.navigationcontroller.toolbar.hidden = YES;
This just hides the toolbar and the UIImage on the homepage is now shifted up the 40px and the black background appears where the toolbar is hidden.
How can I REMOVE the toolbar so the image doesn't get pushed up.
self.navigationController.toolbar.hidden = YES;
needed to be replaced with...
self.navigationController.toolbarHidden = YES;
To keep the position of the child VC's frame move it with 40px down (animation with duration 0.25 f.e.), when you hide the toolbar, or change the navigation controllers bounds origin with origin.y+40, just like you would do, when you are hiding the status bar. But i think an empty space will remain, you should do something with it.
For swift you need to write:
self.navigationController?.isToolbarHidden = true