Navigation Bar's content partially not visible in modal on iOS 13 - swift

A storyboard based application is having issue rendering the navigation bar's content when the navigation bar is displayed in a modal screen, but only when on a physical device. The code behaves properly in iOS 12 and in all simulators both iOS 12 and iOS 13.2.2.
On the left of the screenshot is a iPhone 11 simulator running iOS 13.2.2; on the right is a Reflector projection of my iPhone Xs running iOS 13.2.2 of the same code. We can see there's a space between the tableview and the navigation bar content on the physical device, but on the simulator the tableview is flush against the navigation bar.
There are no table section view headers, tableview margins are set to safe area. Has anyone else experienced that issue and if so, how did you solve it?
Here's a snapshot of the stackview captured from the device, in which we can clearly see the area being mis-rendered is well within the margins of the UINavigationBar:
I was also able to replicate the issue on a brand new project when setting up the following view structure:
The code to run this demo project is available on GitHub at: https://github.com/ekscrypto/stackoverflow-59033294
With the differing behaviours:
We can see physical device showing a bar of red between the navigation bar's content and the tableview; but that red bar is not visible in the simulator.
edit: 2019-11-25 16:45 EDT -- As per comments below I tried to force a refresh of the layout using:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if #available(iOS 13.0, *) {
DispatchQueue.main.async {
self.navigationController?.navigationBar.setNeedsLayout()
self.navigationController?.navigationBar.layoutIfNeeded()
}
}
}
With and without the dispatch async, as well as with and without the layoutIfNeeded; it did not solve this particular issue for me.

Based on the answer at How to prevent gap between uinavigationbar and view in iOS 13?, which wasn't working for me, I solved my issue using the following code:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if #available(iOS 13.0, *) {
self.navigationController?.setNavigationBarHidden(true, animated: false)
self.navigationController?.setNavigationBarHidden(false, animated: false)
}
}
Or in Objective-C:
-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if(#available(iOS 13, *)) {
[self.navigationController setNavigationBarHidden:true animated:false];
[self.navigationController setNavigationBarHidden:false animated:false];
}
}

Related

Presenting modal over modal add a gap between navigation bar and view content

Seems like New iOS 13 modal presentation has issue when presenting a modal over a modal. A gap will be appear between navigation bar and content. check the screenshot.
Refreshing UI fix the issue:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if #available(iOS 13.0, *) {
navigationController?.navigationBar.setNeedsLayout()
}
}

Update to Xcode 11.3.1 - navigationBar and half of the Views disappear after storyboard refactoring

Using Xcode 11.3.1, Simulator11.3.1, iPhoneX, Swift5.1.3, iOS13.3,
I am wondering why half of my app suddenly disappears !!
Could it be the update to Xcode 11.3.1 ???
The following shows a screenshot of the Xcode Debug View Hierarchy.
The left side is what the iPhone 11 Pro Simulator shows and the right side is the Debug View Hierarchy:
Clearly there are many more objects in the view hierarchy (such as the round buttons at the bottom) that are not shown on the Simulator (and also not on a physical iPhoneX). Also the NavigationBar is missing completely !!!!
The blue highlighted object is a custom navigationBar (consisting of a stackView). This worked before but not since the Xcode update. I am really not believing this. What could go wrong here ??
If it is not the Xcode-update, then my refactoring of the storyboard could also be a cause of this view-losses.
Before my refactoring, the VC at question was a ChildViewController of another ViewController. Now, it is the entry point of the App. Could this change bring the view-losses ? I want to see a NavigationController with largeTitle. But there is no NavigationController whatsoever now!
Here is the code that sets up the navigationBar:
override func viewDidLoad() {
// set up navigationItem and navigationController look and feeel
navigationItem.largeTitleDisplayMode = .always
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: nil)
navigationController?.set_iOS12_lookAndFeel()
navigationItem.title = "bluub"
}
And the needed NavigationController extension:
import UIKit
extension UINavigationController {
func set_iOS12_lookAndFeel() {
if #available(iOS 13.0, *) {
self.keep_iOS12_lookAndFeel()
} else {
let attrLargeTitle = AppConstants.FontAttributes.NavBar_LargeTitleTextAttributes
self.navigationBar.largeTitleTextAttributes = attrLargeTitle
let attrTitle = AppConstants.FontAttributes.NavBar_TitleTextAttributes
self.navigationBar.titleTextAttributes = attrTitle
}
}
private func keep_iOS12_lookAndFeel() {
if #available(iOS 13.0, *) {
let navBarAppearance = UINavigationBarAppearance()
navBarAppearance.configureWithDefaultBackground()
navBarAppearance.backgroundEffect = .init(style: .systemThickMaterialDark)
navBarAppearance.titleTextAttributes = AppConstants.FontAttributes.NavBar_TitleTextAttributes
navBarAppearance.largeTitleTextAttributes = AppConstants.FontAttributes.NavBar_LargeTitleTextAttributes
navBarAppearance.buttonAppearance.normal.titleTextAttributes = AppConstants.FontAttributes.NavBar_ButtonAppearance_Normal
navBarAppearance.doneButtonAppearance.normal.titleTextAttributes = AppConstants.FontAttributes.NavBar_Done_ButtonAppearance_Normal
self.navigationBar.standardAppearance = navBarAppearance
self.navigationBar.scrollEdgeAppearance = navBarAppearance
}
}
}
.
---------------- more findings -----------------------------
After another storyboard refactoring, I could bring back the round menu buttons. However, the largeTitle-NavigationBar is still completely missing.
Frankly, the latest refactoring did not introduce any new constraints or other storyboard settings as before. The fact that I kicked out the NavigationController and replaced it by an identical new one, plus, re-assigned one or the other constraint of the menu-button-View, did bring the bottom menu back alive. As far as I can tell, no difference to the previous storyboard was introduced.
It is very annoying why a storyboard needs to be redrawn basically to render correctly. Something seems corrupt here as for the Xcode functionality with storyboard !
But lets leave this talk.
My remaining question:
How can I bring back a missing NavigationBar ?????????
.
---------------- another finding -----------------------------
If I reassign the "first-entry-ViewController" to the old ViewController that eventually adds the Menu-button-ViewController as a ChildViewController --> then everything works!
If I assign the "first-entry-ViewController" to be the Menu-button-ViewController directly, then the NavigationBar disappears !
Here is the overview:
I finally found a solution.
It indeed had to do with my login-architecture of this app.
The fact that only by setting the "first-entry-ViewController" as the old-Main-ViewController made a difference:
This old-Main-ViewController (that eventually adds the Menu-button-ViewController as its Child) did have the following line in its viewWillAppear method:
navigationController?.setNavigationBarHidden(true, animated: animated)
Its intention was actually to never show the navigationBar of its own. But instead load a ChildViewController that itself shows a navigationBar of its own.
The strange thing with storyboard: Even tough setting the Menu-button-ViewController as first-entry does somehow still consider the navigationController-hiding mechanism of the previous first-entry setting. This seems a bug to me inside storyboard. I would assume that visible navigationBar is the default behaviour. But having set it once to be hidden keeps it hidden, even tough the hiding-command is no longer executed. Anyway, very strange behaviour.
By eliminiting that line - or better - by adding it "with hidden = false" inside the Menu-Button-ViewController, makes the NavigationBar being shown again !!!
My learning is to keep an eye on all navigationController actions or mutations throughout the entire App hierarchy. The fact that a single ViewController might mutate something on its navigationController might not be enough. You have to check event parent-ViewControllers or segue-parents as well. And most annoying, applying a different first-entry to a VC does require you to overwrite default behaviours of your views to make sure your views are shown !

a header unexpectedly shows up in all view controllers in iOS 10 and lower

all my view controllers and constraints are fine in iOS 11 and above but in iOS 10 and below a space created in all pages like the pictures below :
I tried even a simple web view in a viewcontroller with four constraints to safe area but I've got the same result.(good view in iOS 11 and above and a space to top in iOS 10 and below. and another strange thing is that some of my apps now have this problem and some don't :| . what should I do?
Can you try this?
if #available(iOS 11.0, *) {
scrollView.contentInsetAdjustmentBehavior = .never
} else {
self.automaticallyAdjustsScrollViewInsets = false
}
Note: Use (tableView, collectionView) instead of scrollview if you are using one.

TextView in iOS 8, Navigation bar is over Text View

Hello I am using iOS 8 (swift)
Now I have this
https://www.dropbox.com/s/tu9issn0b61aphh/IMG_1304.PNG?dl=0
But I need this, so that the textview is showing the beginning of the text!
https://www.dropbox.com/s/0ggzndfr90vcrnj/IMG_1305.PNG?dl=0
I have try lots off stuff, but without success!
I need your help?
In your UIViewController implement the following function
override func viewDidLayoutSubviews() {
myTextView.setContentOffset(CGPointZero, animated: false)
}
Also in viewDidLoad set the following property
automaticallyAdjustsScrollViewInsets = false
I'm unsure as to why this happens, but this will prevent it from happening.
In the attributes inspector of your root view controller be sure that "Under Top Bars" is un-checked.

iPhone popup menu like iPad popover?

How can i implement this popup menu in iphone app like a popover in ipad?
EDIT: This is the best at moment: https://github.com/runway20/PopoverView
iOS 8 and later
Beginning with iOS 8, you can use UIPopoverPresentationController for iPhones in addition to iPads.
Setup
Add a UIBarButtonItem to your main View Controller.
Add another View Controller to the storyboard. Change it to the size that you want the popover to be and add any content that you want it to have. For my example I just added a UILabel. If you want a whole menu, then just add a table view or list of buttons.
Add a segue from the bar button item to the view controller that you will use as the popover. Rather than show, choose Present as Popover.
Select the segue in the storyboard and set the identifier to popoverSegue (or whatever string you called it in the code).
In the Attributes inspector for the popover view controller, check Use Preferred Explicit Size and confirm that it is the size you want it to be.
Code
This is the code for the main view controller that has the bar button item in it.
class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "popoverSegue" {
let popoverViewController = segue.destinationViewController
popoverViewController.modalPresentationStyle = UIModalPresentationStyle.Popover
popoverViewController.popoverPresentationController!.delegate = self
}
}
// MARK: - UIPopoverPresentationControllerDelegate method
func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
// Force popover style
return UIModalPresentationStyle.None
}
}
Popover at an arbitrary anchor point
If you want to set the popover to appear somewhere besides a bar button item (on a UIButton for example) then you need to set the sourceView and sourceRect. See this answer for details.
Further reading
The above example comes mostly from the first link.
iPad Style Popovers on the iPhone with Swift
iOS 8 Popover Presentations
UIPopoverPresentationController on iOS 8 iPhone
General overview of popup options in iOS
Have a look at the iPhone UIPopoverController implementation: WEPopover
On iPhone you would generally use a UIActionSheet for a stack of buttons like that. It slides up from the bottom, rather than popping up next to the button, but that's the standard behavior on iPhone.
There is one that is even better than WEPopover. Developed by a company called 50pixels, it is called FPPopover.
You can download FPPopover at https://github.com/50pixels/FPPopover
You would have to manually instantiate a UIView using a custom background image or drawing with transparency, add some UIButtons (or other type of custom view) on top, and also somehow handle all touches outside that view.
Note that is is non-standard UI. An actionsheet would be more HIG compliant.
To get a popover from a right side bar button item on a navigation controller that is part of a tableview controller, the following worked for me for Swift 4 and Xcode 9.
Follow the steps in Suragch answer above (as edited by the Community.)
Do not implement the Segue as shown in the answer above. For some reason, the segue causes the popover to go full screen despite setting the explicit size.
Give your popover view controller a title in Attributes Inspector
Add the following code in the TableView controller where the popup will show.
Modify the string identifier (the one here is referencing a Constant.swift file)
Modify "as! FilterVC" to use the title of the your popover view controller.
/// Shows a filter popover view
#IBAction func filterBtnPressed(_ sender: UIBarButtonItem) {
let popover = storyboard?.instantiateViewController(withIdentifier: FILTER_VC) as! FilterVC
popover.modalPresentationStyle = UIModalPresentationStyle.popover
popover.popoverPresentationController?.backgroundColor = UIColor.green
popover.popoverPresentationController?.delegate = self
popover.popoverPresentationController?.backgroundColor = ColorPalette.Blue.Medium
popover.popoverPresentationController?.sourceView = self.view
popover.popoverPresentationController?.sourceRect = CGRect(x: self.view!.bounds.width, y: 0, width: 0, height: 0)
popover.popoverPresentationController?.permittedArrowDirections = .up
self.present(popover, animated: true)
} }
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return UIModalPresentationStyle.none
}
You can check WYPopoverController: https://github.com/sammcewan/WYPopoverController
The screenshot above is not a UIActionSheet. It looks like a simple UIView subclass with custom UIButtons on top of it. So go ahead and create the subclass according to your needs and then add it as a subview to your view every time you need it.