On iOS 14, when presenting a modal navigation controller, non full screen, with UIPresentationController and modalPresentationStyle custom, the navigation bar take account into the safe area top inset (even if prefersStatusBarHidden is true). So, there is a gap equal to the status bar height at the top of the presented view.
Any ideas?
Fixed using the private API method _viewSafeAreaInsetsFromScene.
Related
I have a UIViewController that contains a UICollectionView pinned to all edges of the view. This view controller is inside a UINavigationController.
I want to gradually hide the navigation bar as I scroll down in the collection view. At the point that I have scrolled the distance of the height of the nav bar, the nav bar should be completely hidden. If I scroll back up it should gradually show the nav bar.
I have tried all the open source navigation bars on github, but none of them work correctly with iOS 12.
How can I achieve this?
UICollectionView is a subclass of UIScrollView and therefore you have access to its scrollViewDidScroll delegate method. Your UIViewController is also owned by its navigation controller, so you can create an instance property in the view controller, like navigationDelegate: UINavigationController?, that will act as a delegate. In the navigation controller, set that property equal to self and manipulate the nav bar however you want through the scroll delegate. Absolutely no need for third-party scripting for something this standard and basic.
I was creating an app where there is a view controller presented as a pop over, but when I try to present the view controller, the navigation bar that isn't part of the navigation controller overlaps with the status bar. The height on the attributes inspector reads 44 for the navigation bar.
On the other hand, I have another navigation bar inside a navigation controller, and with the attributes inspector still reading 44, it produces a completely different result.
Could this be a problem with constraints? Or is a navigation controller's navigation bar size larger for some reason?
I think you have added a navigation bar to a Add League UIViewController. The solution would be using a navigation controller with Add League as its child controller.
I have created a storyboard layout which contains UIViewControllers within UINavigationControllers which all connect back to a UITabBarController. There is a login page which is not connected to anything (just a UIViewController) which segues into the UITabBarController when the app detects user authentication. You can see what this looks like in the following image:
When I set the translucent property of the Navigation Bar to "false" or "No", the view y origin gets pushed down to the bottom of the Navigation Bar (which is the behavior that I am looking for). However, when I set the translucent property of the Tab Bar to "false" or "No", the Tab Bar DOES become opaque, but the view is not resized to fit between the top and bottom bars. I have unchecked the Extend Edges property for both Under Top Bars and Under Bottom Bars for all UIViewControllers, UINavigationControllers, and the UITabBarController.
When I add subviews programmatically (no auto-layout), the UIViewController's view is still the height of the entire screen, and is only pushed down from the top bar, but not pushed up from the bottom bar. While creating this question, this is the result I got on the simulator (subviews are not even starting below the Navigation Bar):
The layout that I'm trying to achieve is to have the view fit between the Navigation Bar and the Tab Bar so that both bars are opaque and no content goes underneath them. Any ideas or suggestions?
EDIT:
After eliminating individual Navigation Controllers and adding a single one before the TabBar Controller, I'm getting weird behavior including navigation items disappearing and one of my subviews still goes under bottom bar.
EDIT 2:
After doing some research, It seems that having navigation controllers inside each tab is a normal view hierarchy. Unfortunately, I still have not figured out how to limit a view controller's view to be between a navigation bar and a tab bar. Any suggestions?
I am using a search bar plus controller for a UITableview in my MasterController. When the view shows up, the navigationbar in the MasterController is black until the view fully loads (not sure why?). In order to fix this I set the self.navigationController.navigationBar.translucent = false; This fixed the issue I was having with the navigation bar being black initially, but now it looks like when I click a cell in the uitableview of the MasterController, the content in the DetailView that loads shifts down approximately the size of the search bar, but it's just blank space above the content that has been shifted... When I remove the translucent property in the MasterController the content in the DetailView is fine and not shifted...
SO my question is, what is shifting this content down and how can I stop the content from being shifted AND having an opaque navigation bar...
In iOS 7, by default your view controller's view extends under a translucent navigation bar when contained in a UINavigationController but not on an opaque one. You could set the extendedLayoutIncludesOpaqueBars property of the view controller if you want it to extend under opaque nav bars too.
When you say your scroll view is shifted on your detail view controller it's probably because its y origin is not set to zero to offset for your view extending under a translucent nav bar, but because your nav bar is now opaque and your view is not extending under it the space is now visible.
One thing more view controllers will actually automatically add insets on scroll views they contain so that their contents are not obscured when the view controllers view extends under navigation bars. It is set by the automaticallyAdjustsScrollViewInsets property which is by default is set to YES.
I will appreciate if someone can show how to use the topLayoutGuide and bottomLayoutGuide properties of UITableViewController introduced in iOS 7. Thank you.
The topLayoutGuide and bottomLayoutGuide properties are inherited from UIViewController and implements the UILayoutSupport protocol. They are designed to be used with AutoLayout, but can also be used directly without the use of AutoLayout.
In the case of topLayoutGuide, the property indicates the highest vertical extent for content that you don't want to appear behind a translucent or transparent UIKit bar (such as a status or navigation bar). So, if your view controller has been pushed onto a UINavigationController stack, topLayoutGuide will tell you how many points from the top of the screen the status bar and navigation bar cover. You can use this value scroll content in a UIScrollView to just below the navigation bar or ensure other content in your view isn't being covered by the UINavigationBar.
Keep in mind that the value of topLayoutGuide depends on the view controller and whether or not it's contained within another view controller. From Apple's UIViewController documentation:
The object that constrains the value for this property depends on
whether or not the view controller is a child of a container view
controller (such as a navigation or tab bar controller), as follows:
• A view controller not within a container view controller constrains
this property to indicate the bottom of the status bar, if visible, or
else to indicate the top edge of the view controller's view.
• A view controller within a container view controller does not set this
property's value. Instead, the container view controller constrains
the value to indicate:
The bottom of the navigation bar, if a
navigation bar is visible
The bottom of the status bar, if only a
status bar is visible
The top edge of the view controller’s view, if
neither a status bar nor navigation bar is visible
Here's a piece of code I use to move a UITextField in response to the showing of the keyboard. I move the textfield to just below the navigation bar.
CGFloat length = self.topLayoutGuide.length;
_feedback.frame = CGRectMake(_feedback.frame.origin.x, length + 5.0, _feedback.frame.size.width, _feedback.frame.size.height);
Using bottomLayoutGuide is exactly like using topLayoutGuide, except the bottomLayoutGuide refers to the lowest vertical extent for content.