I want my app to go back to main root view controller on button click, but when i press the button it goes but the navigation bar is disappeared. I have tried different solutions but no luck.
Try this:
In your Root View Controller, add this code:
override func viewWillAppear(animated: Bool) {
self.navigationController?.navigationBarHidden = false
}
Related
I have view controller which navigation bar is hidden.
navigationController?.isNavigationBarHidden = true
I push another controller when tap on a button.
navigationController?.pushViewController(qrGenerateVC, animated: true)
In the second view controller the navigation bar is not hidden.
In other situations when I swipe back the second navigation bar hides smoothly but in this situation It disappear when I start swiping back. so it makes the view look not good.
This is similar to this question which does not have answer. And the view is similar too.
Before swipe screenShot
After swipe screenShot
These images are from that question. but similar thing happens here.
Set this in your second view controller
override func viewWillAppear(_ animated: Bool) {
self.navigationController?.isNavigationBarHidden = false
}
Consider a storyboard where we have UITabBarController, in it any UIViewController(lets call it VC) embedded in a UINavigationController. We want VC to have a BarButtonItems on its navigation bar. This storyboard is presented by push segue from another storyboard (having another navigation controller).
Everything looks OK in XCode, but navigation bar does not change in VC at the runtime. However when I change presenting this storyboard from push to modal, everything seems to be fine. IMHO it is because of embedding the navigation controller but I do not see any reason why it is not working. Any idea how to fix it legally (presenting by push) and without any pain would be helpful.
Thanks in advance
So I think you will have to employ some code to fix your issue but not much. I built a test project to test this and will attach images along with code.
First if I understand you correctly you have a navigationController push the new storyboard in question. See attached image.
I named the storyboard being pushed because that is what is happening. Then in my storyboard named Push here is the setup.
In the first view controller of the tabbarcontroller I added the below code. Obviously this hides the navigation controller that pushed us here. If you then visit controller number 2 our new navigation controller and items show. If hiding the navigation controller in the tabbarcontroller view controller 1 is not what you want to do then. continue reading.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//or to unhide from returning the opposite ->self.parent?.navigationController?.isNavigationBarHidden = true
self.parent?.navigationController?.isNavigationBarHidden = true
}
If you did not want to hide the navigation controller in the first view controller but when visiting controller 2 you want to see your items then add this to your viewWillAppear and in the first controller in viewWillAppear change the code from true to false.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Do any additional setup after loading the view, typically from a nib.
self.parent?.navigationController?.isNavigationBarHidden = true
}
This hides the parent navigation controller as basically that was covering up your navigation controller in your example. So above hides the parent navigation controller. This is also why presenting modally worked. Your navigation controller was hidden from the start. Hope this helps.
**Edit
If you want the navigation controller in tab 2 view controller but you want to keep the parent in tab one to be able to go back with the back button you can set this in viewWillAppear instead so it would look like this in view controller 1.
//tabcontroller vc 1
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.isNavigationBarHidden = false
}
And in tabcontroller view controller 2 with the item in the bar you could do this.
//tabbarcontroller vc 2 with own navigationcontroller
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.parent?.navigationController?.isNavigationBarHidden = true
}
Finally if you want the back button visible in both controllers but want different right buttons do it programmatically in viewWillAppear
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tabBarController?.navigationItem.setRightBarButton(UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: #selector(FirstViewController.editSomthing)), animated: true)
}
And if you want to remove it in the other controller
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tabBarController?.navigationItem.rightBarButtonItem = nil;
}
In Both of the above examples directly above this, we are keeping the parent navigation controller so you would not need to embed your view controllers of the tab controller inside uinavigation controller.
You could also use a combo of the above code if you want the hide/show parent navigation controller in viewWillAppear as well. Some of this is dependent on the view hierarchy you choose now and in the future.
My Tab Bar Controller controls 5 view controllers and I want that in those 5 main pages all the back buttons are disabled and not visible. How can I do that correctly? I have tried all Swift commands seen here in SO but none has worked up to now.
I have tried with
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.hidesBackButton = true
}
override func viewWillAppear(animated: Bool) {
self.navigationItem.hidesBackButton = true
}
but they don't work. I have also tried with
self.tabBarController?.navigationItem.hidesBackButton = true
but this is the strange result
To remove the "back" button from the navigation bar, you can create a UITabBarController class for your UITabBarController in the storyboard, and in that class, inside the ViewDidLoad() method, you can call
self.navigationItem.hidesBackButton = true
This will remove the back button.
The back button is probably added by the navigationcontroller of the tabbarcontroller. So you will have to check the tabbar navigation controller.
Something like this:
self.tabbarcontroller.navigationcontroller.navigationitem.hidesBackButton = true
I think this will resolve the issue. Since the backbutton normally is added by a navigationcontroller, and not by a tabbarcontroller
Update
I have recommended him that he should loose the navigation controllers after the tabbarcontroller. Since the tabbar already implements the navigation needed between the different views. This and hidesbackbutton = true solved his issue
I have a parent TableViewController and a child ViewController all within the context of a navigation controller. What I want to happen is for the table view controller to NEVER show the nav bar, and for the view controller to ALWAYS show the nav bar. I hide and show the nav bar within the viewWillAppear func of each subclass, like this:
table view controller:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true);
navigationController?.navigationBar.hidden = true
UIApplication.sharedApplication().statusBarHidden=true
}
view controller:
override func viewWillAppear(animated: Bool) {
self.navigationController?.navigationBarHidden = false
}
This works for the first navigation. When I launch the app, the parent table view controller hides the nav bar, and when I select the first cell, the child view controller dutifully displays the nav bar. However, when I touch 'Back' on the nav bar, and then select the cell again, the view controller is no longer displaying the nav bar.
Is there a better way to do this?
Update - as requested attaching screenshots of XIB and Storyboard. Note that there is no XIB for the parent TableViewController. I am not confident that these screenshot will provide much insight. Especially that of the storyboard. Unfortunately, Xcode only has 2 zoom levels:
1. Too zoomed in to be useful
2. Too zoomed out to be useful
Nonetheless, here you have them:
That should work fine: When your ViewController will appear, the code should get executed every time. Try with an "print" to test if that happens.
First View Controller
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
print("viewWillLoad - Table View")
self.navigationController?.navigationBarHidden = false
}
Second View Controller
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
print("viewWillLoad - Detail View")
self.navigationController?.navigationBarHidden = true
}
Ill use that in some applications too.
I have a UINavigationController and I want its root view controller to hide the navigation bar, so I wrote this in the root view controller's class:
override func viewWillLayoutSubviews() {
self.navigationController?.setNavigationBarHidden(true, animated: false)
}
This effectively hides the navigation bar. This root view controller has a button that pushes a new view controller when tapped. I want this second view controller to show the navigation bar, so in its subclass:
override func viewWillLayoutSubviews() {
self.navigationController?.setNavigationBarHidden(false, animated: false)
}
Navigation bar is then shown, but when I tap its back button and I navigate back to the previous view controller (the one I wanted to hide the navigation bar), for an instant at the top of its view it is shown a black space where the navigation bar should be, and finally the view "goes" to the top of the screen again.
How could I avoid this effect?
Try to set the navigation bar hidden in viewWillAppear.
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated);
self.navigationController?.setNavigationBarHidden(true, animated: false)
}