When i close to UiPageVC, after UiPageVC's viewWillDisappear call, ChildVC's viewWillAppear and viewDidAppear function calls. At the end, UiPageVC's viewDidDisappear works.
I need to work ChildVC like normal way. When i dismiss to UiPageVC, viewWillDisappear and viewDidDisappear of ChildVC should call.
According to this answer, viewWillDisappear(_:) & viewDidDisappear(_:) might not get called in child view controller.
Following Apple's Doc, override viewWillDisappear(_:) & viewDidDisappear(_:) in UIPageViewController subclass.
override func viewWillDisappear(_ animated: Bool) {
super.viewWillAppear(animated)
children.forEach { $0.beginAppearanceTransition(false, animated: true) }
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
children.forEach { $0.endAppearanceTransition() }
}
I want to hide the navigationbar for only one viewcontroller which is the root viewcontroller of the UINavigationController.
Currently I am using below code to hide the navigation bar for a particular viewcontroller.
To hide the navigationbar,
override func viewWillAppear(_ animated: Bool) {
self.navigationController?.isNavigationBarHidden = true
super.viewWillAppear(animated)
}
To show the navigationbar for other viewcontrollers,
override func viewWillDisappear(_ animated: Bool) {
self.navigationController?.isNavigationBarHidden = false
super.viewWillDisappear(animated)
}
When I am trying to use this code, the app is being crashed in iOS 13 devices because of threading violation: expected the main thread.
Please checkout the issue which I am getting when I use the above code to hide the navigationbar,
iOS 13: threading violation: expected the main thread
Please let me know if there is any other way to hide the navigationbar for only one viewcontroller.
I got the another way to hide/show navigationbar from one of my friend.
Set a delegate for the NavigationController:
navigationController.delegate = self
Hide/Show navigationbar for each ViewController all in one place
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
let hide = (viewController is YourVC)
navigationController.setNavigationBarHidden(hide, animated: animated)
}
import UIKit
class ViewController: UIViewController {
override func viewWillAppear(_ animated: Bool){
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = true
}
override func viewWillDisappear(_ animated: Bool){
super.viewWillDisappear(animated)
self.navigationController?.isNavigationBarHidden = false
}
}
You can make it transparent (Completely invisible) when viewWillApper get called and back to normal when view willDisappear get called. Here are helper functions.
func makeNaBarTransparent() {
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()
navigationController?.navigationBar.isTranslucent = true
}
func restoreNavigationBarToDefault() {
navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
navigationController?.navigationBar.shadowImage = nil
}
USAGE
import UIKit
class ViewController: UIViewController {
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
makeNaBarTransparent()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
restoreNavigationBarToDefault()
}
}
hey guys Im using navigation controller but what I want to do is remove the huge space made by navigation controller on the first view but retain the back button on the succeeding views. TIA
SWIFT 3.0
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = true;
}
override func viewWillDisappear(_ animated: Bool)
{
super.viewWillDisappear(animated)
self.navigationController?.idNavigationBarHidden = false;
}
I want to hide the navigation bar for the first view controller and show for the rest. In order to achieve this I wrote the following code :
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBarHidden = true
}
override func viewWillDisappear(animated: Bool)
{
super.viewWillDisappear(animated)
self.navigationController?.navigationBarHidden = false
}
After writing this code it works fine, i.e this view controller does not show the navigation bar and the rest show as desired. But after writing this code another problem arise which is as follows:
problem link.
According to the solution given on the above link I need to remove the code:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBarHidden = true
}
Which brings me back to problem 1
Can anybody help to get rid of both issues?
Use this instead of navigationBarHidden:
self.navigationController?.setNavigationBarHidden(true, animated: animated)
In your SecondViewController add this code:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBarHidden = false
}
On the View you want to hide navigation bar. put this code.
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBarHidden = true;
print("Navgition bar hidden")
}
On the next View, from where you want to show the navigation bar. put below code.
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.navigationBarHidden = true;
print("Navgition bar show")
}
How can I hide a navigation bar from first ViewController or a particular ViewController in swift?
I used the following code in viewDidLoad():
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.isNavigationBarHidden = true
}
and also on viewWillAppear:
override func viewWillAppear(animated: Bool) {
self.navigationController?.isNavigationBarHidden = true
}
Both methods hide the navigation controller from all ViewControllers.
If you know that all other views should have the bar visible, you could use viewWillDisappear to set it to visible again.
In Swift:
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(true, animated: animated)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
navigationController?.setNavigationBarHidden(false, animated: animated)
}
Swift 3
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Hide the navigation bar on the this view controller
self.navigationController?.setNavigationBarHidden(true, animated: animated)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Show the navigation bar on other view controllers
self.navigationController?.setNavigationBarHidden(false, animated: animated)
}
You can unhide navigationController in viewWillDisappear
override func viewWillDisappear(animated: Bool)
{
super.viewWillDisappear(animated)
self.navigationController?.isNavigationBarHidden = false
}
Swift 3
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.navigationController?.setNavigationBarHidden(false, animated: animated)
}
You could also create an extension for this so you will be able to reuse the extension without implementing this again and again in every view controller.
import UIKit
extension UIViewController {
func hideNavigationBar(animated: Bool){
// Hide the navigation bar on the this view controller
self.navigationController?.setNavigationBarHidden(true, animated: animated)
}
func showNavigationBar(animated: Bool) {
// Show the navigation bar on other view controllers
self.navigationController?.setNavigationBarHidden(false, animated: animated)
}
}
So you can use the extension methods as below
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
hideNavigationBar(animated: animated)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
showNavigationBar(animated: animated)
}
In Swift 3, you can use isNavigationBarHidden Property also to show or hide navigation bar
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Hide the navigation bar for current view controller
self.navigationController?.isNavigationBarHidden = true;
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Show the navigation bar on other view controllers
self.navigationController?.isNavigationBarHidden = false;
}
Ways to hide Navigation Bar in Swift:
self.navigationController?.setNavigationBarHidden(true, animated: true)
self.navigationController?.navigationBar.isHidden = true
self.navigationController?.isNavigationBarHidden = true
Ways to show Navigation Bar in Swift:
self.navigationController?.setNavigationBarHidden(false, animated: true)
self.navigationController?.navigationBar.isHidden = false
self.navigationController?.isNavigationBarHidden = false
private func setupView() {
view.backgroundColor = .white
navigationController?.setNavigationBarHidden(true, animated: false)
}
Alternative
in viewDidLoad use this settings
title = "Madman"
navigationController?.isNavigationBarHidden = false
navigationController?.navigationBar.prefersLargeTitles = true
navigationItem.largeTitleDisplayMode = .always
Check the constraints of Collectionview, scrollview or tableView
NSLayoutConstraint.activate([
tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])
Want to Hide the NavigationBar on the First ViewController
override func viewWillAppear(animated: Bool) {
self.navigationController?.isNavigationBarHidden = true
}
Want to Show the NavigationBar on the Second ViewController
override func viewWillAppear(animated: Bool) {
self.navigationController?.isNavigationBarHidden = false
}
/*. Swift 5 */
let controller = self.storyboard?.instantiateViewController(withIdentifier: "sc_userNavigation") as! UserNavigationViewController
let navigationController = UINavigationController(rootViewController: controller)
navigationController.setNavigationBarHidden(true, animated: false)
navigationController.modalPresentationStyle = .fullScreen
self.present(navigationController, animated: false, completion: nil)
In IOS 8 do it like
navigationController?.hidesBarsOnTap = true
but only when it's part of a UINavigationController
make it false when you want it back
I use a variant of the above, and isolate sections of my app to be embedded in differing NavControllers. This way, i don't have to reset visibility. Very useful in startup sequences, for example.
Call the set hide method in view Will appear and Disappear. if you will not call the method in view will disappear with status false.It will hide the navigation bar in complete navigation hierarchy
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.setNavigationBarHidden(true, animated: true)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.navigationController?.setNavigationBarHidden(false, animated:true)
}
You can do it from the window controller (Swift3)
class WindowController: NSWindowController {
override func windowDidLoad() {
super.windowDidLoad()
window?.titleVisibility = .hidden
}
}