I'm presenting my UIViewController with modalPresentationStyle = .formSheet. Everything works as expected except interactive dismissing this controller (I drag form sheet from the top down). Controller is dismissed but it's presentingViewController doesn't move back. It remains stucked with black edges around.
If I dismiss presented controller using dismiss(animated:completion:), presentingViewController moves back as expected so it seems it doesn't work just when user dismiss it by dragging.
If you need any other details let me know. Thank you. 🙏
I'm using iOS 13.3 and Xcode 11.2.1.
Update:
I found a problem. 🎉 This view which I presented contained UITableView. I was using my method to set its tableFooterView:
extension UITableView {
func setFooterView(_ view: UIView) {
view.frame = bounds
view.setNeedsLayout()
view.layoutIfNeeded()
let height = view.systemLayoutSizeFitting(
CGSize(width: view.frame.width, height: UIView.layoutFittingCompressedSize.height)
).height
var frame = view.frame
frame.size.height = height
view.frame = frame
tableFooterView = view
sectionFooterHeight = 0
}
}
...and I called this method in my view controller in viewDidLayoutSubviews() since I thought that this is where I should set this footer view (Simply because we were using it like this in various projects 🤷🏻♂️):
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
tableView.setFooterView(footerView)
}
But I wasn't right. Simply calling it in viewDidLoad() resolved it.
override func viewDidLoad() {
super.viewDidLoad()
tableView.setFooterView(footerView)
}
No the question is: why?
If anyone could provide correct explanation why this happens I would be grateful and I would reward him/her with bounty. 🎁
I'm working with a UITableViewController which when scrolling makes the navigationBar disappear. Now when the navigation bar is hidden when the user swipes the table view the contents of the cells are seen below the status bar ...
To solve this problem I tried to insert a UIView to simulate a background of the status bar and everything works but the problem is that when I close the UITableViewController the background view of the status bar is not removed from the superview
For now my code is this, can you help me understand where I am wrong? why can't I remove the UIView from the superview?
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
setupStatusBarView()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.navigationBar.isHidden = true
UIApplication.shared.windows.first?.viewWithTag(1)?.removeFromSuperview()
}
//MARK: - Setup Status Bar View
func setupStatusBarView() {
let height = view.window?.windowScene?.statusBarManager?.statusBarFrame.height ?? 0
let statusBarView = UIView()
statusBarView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height:height+5)
statusBarView.backgroundColor = .systemBackground
statusBarView.tag = 1
UIApplication.shared.windows.first?.addSubview(statusBarView)
}
viewDidLayoutSubviews get calls multiple times and you have put setupStatusBarView() in viewDidLayoutSubviews that means your background view has been added multiple times and this is totally wrong flow!
You are removing topmost view only not previous ones!
You should set frame in viewDidLayoutSubviews and should add the view from viewDidLoad!
try this one
let subviewArray = UIApplication.shared.windows.first?.subviews
for view in subviewArray!{
if view.tag == 1{
view.removeFromSuperview()
}
}
I have modaly presented view controller in iOS >=13. Root view has clear background:
view.backgroundColor = .clear
Child view with white background has some top offset like this:
All is ok, but when I try to dismiss it by swipe down I see slightly visible shadow of presented view controller:
Is it posible to remove this shadow on modal presentation?
UPDATE: Upon further investigation, this does not appear to be something that can be changed. It's a private UIKit View setup by iOS and is a new addition in iOS 13. See 19:50 at https://developer.apple.com/videos/play/wwdc2019/224/
For my own apps/games I'll be looking to create a custom UIModalPresentationStyle to achieve the look I want.
You can also alleviate from this by simply presenting as .fullScreen or another presentation style instead of this new sheet method.
I have been trying to find the answer to this myself. So far I have only found that by setting the layer.shadowColor to clear it fixes this but only on iPhone. I cannot find how to fix this on iPad.
override func viewDidLoad() {
view.layer.shadowColor = UIColor.clear.cgColor
}
I have solution for you
extension UIViewController {
func removeBackgroundForParents() {
var superview = view.superview
while superview != nil {
superview?.layer.backgroundColor = UIColor.clear.cgColor
superview?.layer.shadowColor = UIColor.clear.cgColor
superview = superview?.superview
}
}
}
And use it in your view controller.
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
removeBackgroundForParents()
}
I have UIViewController that has inputAccessoryView overrided with custom UITextView, lets call that view controller A. And I have another view controller that push A to navigation stack.
So, when I push A first time everything is ok - the UITextView appeared with text immediately. The strange thing starts with next push - the UITextView's text does not appear until view controller push transition animation end.
=>
The code of viewController A is there:
class NextViewController: UIViewController {
private var userInputView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.grayColor()
let textView = UITextView(frame: CGRect(origin: .zero,
size: CGSize(width: 200, height: 30)
), textContainer: nil)
textView.text = "asd"
userInputView = textView
}
override var inputAccessoryView: UIView? {
return userInputView
}
override func canBecomeFirstResponder() -> Bool {
return true
}
}
Tested in iOS 9.3 simulator.
After some coding I noticed that if inputAccessoryView is not deallocated (stored somewhere in global scope) the appearance during animation is defined by last UITextView state. But this solution is not good for me is ok actually. But is there any native-like solution, am I missing something? Because the desired behaviour is rather standard in my opinion.
So I will stick with the solution where the inputAccessoryView is stored until next appearance.
I am updating my app to use iOS 7 and I'm having a problem with a table view. My tab bar is translucent. The problem is when I scroll to the bottom of my table view, part of the last cell is still behind the tab bar. I'd like to have a bit of space between the last cell and the tab bar. I could fix this by using an opaque tab bar instead, but I want to keep it translucent.
Try setting
self.edgesForExtendedLayout = UIRectEdgeNone;
self.extendedLayoutIncludesOpaqueBars = NO;
self.automaticallyAdjustsScrollViewInsets = NO;
Inside the tableview controller
Swift 4.x
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(0, 0, self.tabBarController!.tabBar.frame.height, 0)
self.yourTableView.contentInset = adjustForTabbarInsets
self.yourTableView.scrollIndicatorInsets = adjustForTabbarInsets
Check the screen shot
Check the under top Bar and Un-checke under Bottom Bar
SWIFT 3
put this inside viewDidLoad of your tableViewController:
self.edgesForExtendedLayout = UIRectEdge()
self.extendedLayoutIncludesOpaqueBars = false
self.automaticallyAdjustsScrollViewInsets = false
Swift 3.0
This is what worked for me. In your Custom ViewController:
override func viewDidLoad() {
super.viewDidLoad()
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(self.tabBarController!.tabBar.frame.height, 0, 0, 0);
//Where tableview is the IBOutlet for your storyboard tableview.
self.tableView.contentInset = adjustForTabbarInsets;
self.tableView.scrollIndicatorInsets = adjustForTabbarInsets;
}
Not to sure I like the solution but it works for me.
With iOS 11 I have no issue, I simply use the following in viewDidLoad():
self.collectionView.bottomAnchor.constraint(self.view.safeAreaLayoutGuide.bottomAnchor).isActive = true
However on iOS 10 I need to hack my way like this:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let tabBarHeight: CGFloat = (self.parent?.tabBarController?.tabBar.frame.size.height)!
if #available(iOS 11.0, *) {
} else {
self.collectionView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -tabBarHeight).isActive = true
}
}
This is working for me
override func viewDidLoad() {
self.edgesForExtendedLayout = UIRectEdge()
self.extendedLayoutIncludesOpaqueBars = false
}
If any view shows behind a UITabBar you can grab the bottomLayoutGuide and make adjustments at runtime. What I do is have a BaseViewController that all my view controllers inherit from. Then if the tab bar is visible we adjust the view like so:
import UIKit
class BaseVC: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
//Ensures that views are not underneath the tab bar
if tabBarController?.tabBar.hidden == false {
var viewBounds = self.view.bounds;
var bottomBarOffset = self.bottomLayoutGuide.length;
self.view.frame = CGRectMake(0, 0, viewBounds.width, viewBounds.height - bottomBarOffset)
}
}
}
Since I don't use storyboards (where you can click a checkbox in IB to fix this problem), this has been the best solution I have found.
It is really hard to resolve the issue without detail information or actual codes. I have similar issue of tabview behind UItabBar in my project. The solutions offered here do not work in my case. After exploring my codes, I found a solution for my case.
Here is brief explanation of my case. I have a UItabBar in main view with two tab buttons. In one tab view, there is table view. If user taps on a row, a detail view is presented by using navigation controller. In the detail view, the tab bar is hidden, and a toolbar is showing at the bottom.
In order to bring tab bar back and hide the toolbar when the main view is brought back, I have to explicitly show tab bar and hide toolbar in the event of viewWillAppear:
class myMainViewController: UITableViewController {
private var tabBarHidden: Bool? = {
didSet {
self.tabBarController?.tabBar.isHidden = tabBarIsHidden ?? true
}
}
private var toolBarIsHidden: Bool? {
didSet {
let hidden = toolBarIsHidden ?? true
self.navigationController?.toolbar.isHidden = hidden
self.navigationController?.setToolbarHidden(hidden, animated: true)
}
}
...
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tabBarIsHidden = false
self.toolBarIsHidden = true
}
...
}
I finally realize that the visibility of bar at the bottom is set in the event of viewWillAppear. At that time, the tableView or scroll view's content insets are set already based on no bar at the bottom. That's why my tableView is behind the bottom bar.
The solution I found is to reset content insets in the event of viewDidAppear:
override func viewDidAppear(_ animated: Bool) {
// In the event of viewWillAppear, visibilities of tool bar and tab bar are set or changed,
// The following codes resets scroll view's content insets for tableview
let topInset = self.navigationController!.navigationBar.frame.origin.y +
self.navigationController!.navigationBar.frame.height
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(
topInset, 0,
self.tabBarController!.tabBar.frame.height, 0)
self.tableView.contentInset = adjustForTabbarInsets
self.tableView.scrollIndicatorInsets = adjustForTabbarInsets
}
The best approch would be to Embed TabBarController to your ViewController (Editor -> Embed In -> TabBar Controller)and set the bottom of the tableview to be bottom of safe area of viewcontroller. The other ways wont be as perfect as this one.
You need to adjust the height of the table view. Just leave 49px at the bottom, as the tabbar height is 49 px. Adjust the height of table view so that it leaves 49px space below it.