I have two view controllers and a button in my storyboard. I don't understand why this is not pushing the view to the second view controller. I have the Storyboard ID and Class of FirstViewController, so shouldn't it work? I keep getting this error Unknown class FirstViewController in Interface Builder file. What am I doing wrong?
#IBAction func button(sender: AnyObject) {
let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("FirstViewController")
self.navigationController?.pushViewController(viewController!, animated: true)
}
Just to have an answer for others -->
Two ways to solve it ->
1.Add a navigationController in the storyboard, as you cannot do pushViewController on a viewController outside navigationController's stack.
2.You can push it as a modal view controller, using self.presentViewController(viewController, animated: true, completion: nil)
This will give a modal effect, and not the normal push effect.
Related
I have UINavigationController with several pushed view controllers.
UPD: Last pushed controller modally presents another controller.
Also, I have UINavigationControllerDelegate with some logic at navigationController:willShowViewController:animated:.
UPD: Navigation controller is its own delegate. Delegate is set in viewDidLoad method.
Question rises when I try to close all controllers programically from presented view controller:
// Close all controllers in navigation stack
presentingViewController?.navigationController?.popToRootViewController(animated: true)
// Close presented view controller
dismiss(animated: true, completion: nil)
Method navigationController:willShowViewController:animated: is not called. But it is called when I do the same without presented controller (thanks to #donmag for example project where it works).
Searched SO for answers or similar questions, but found nothing, any thoughts?
In your "presenting" VC, you want to implement a delegate/protocol pattern so your "presented" VC can call back and perform the dismiss and popToRoot...
// protocol for the presented VC to "call back" to the presenting VC
protocol dismissAndPopToRootProtocol {
func dismissAndPopToRoot(_ animated: Bool)
}
// in the presenting VC
#IBAction func presentTapped(_ sender: Any) {
if let vc = storyboard?.instantiateViewController(withIdentifier: "presentMeVC") as? PresentMeViewController {
// Assign the delegate when instantiating and presenting the VC
vc.dapDelegate = self
present(vc, animated: true, completion: nil)
}
}
func dismissAndPopToRoot(_ animated: Bool) -> Void {
// this will dismiss the presented VC and then pop to root on the NavVC stack
dismiss(animated: animated, completion: {
self.navigationController?.popToRootViewController(animated: animated)
})
}
// in the presented VC
var dapDelegate: dismissAndPopToRootProtocol?
#IBAction func dismissTapped(_ sender: Any) {
// delegate/protocol pattern - pass true or false for dismiss/pop animation
dapDelegate?.dismissAndPopToRoot(false)
}
Here's a full demo project: https://github.com/DonMag/CustomNavController
From documentation:
popToRootViewControllerAnimated:
Pops all the view controllers on the stack except the root view controller and updates the display.
popViewControllerAnimated:
Pops the top view controller from the navigation stack and updates the display.
So seems like in order to get navigationController:willShowViewController:animated: called every time you have to do subsequent popViewControllerAnimated:, because the display got updated each time after you pop a new controller. When you pop to root view controller, update display is called only once.
i have login view controller. when usersingin i' showing popup for that i
refereed
https://www.youtube.com/watch?v=S5i8n_bqblE i can achieved that.
popup had button when i click the button navigation to next view controller
but its now working when i am clicking that action is performing but its not navigating to next view controller wher i did mistake
Singin
class DigitalGateViewController: NANavigationViewController
{
#IBAction func singin(_ sender: UIButton)
{
let lv = NAViewPresenter().activityVC()
self.present(lv, animated: true)
}
}
this is popupviewcontroller
class ActivityViewController: NANavigationViewController {
#IBAction func okbuttonclick() {
let dv = NAViewPresenter().myGuestListVC()
// self.navigationController?.pushViewController(dv, animated: true)
}
}
its not push to textview controller in swift
When you present a view controller, its presented modally and is not pushed onto the previous navigation controller's stack. Hence, you tried to call self.navigationController?.pushViewController(), it doesn't work, because self i.e. NAViewPresenter().myGuestListVC() isn't embedded in a navigation Controller.
If you want to push the new VC onto the previous stack, you will have to dismiss the presented pop up and then push. The easiest way to do this is to use a delegate method.
Edit:
if you want to create a new navigationController, you can do something like this :
let navController = UINavigationController(rootViewController: NAViewPresenter().myGuestListVC())
present(navController, animated: true)
After presenting the navController, you can use self.navigationController.push method henceforth.
The reason why its not pushing because you are presenting it modally not pushing on the navigation stack and so it wont have any navigationController. If you want to push from your modal popup, you can access the property presentingViewController on your modal object and try to push it on navigationController from there.
self.presentingViewController?.navigationController?.pushViewController(myVC, animated: true)
dismiss(animated: true, completion: nil)
I want to segue to a new ViewController programatically but when I do my tabBar disappears.
if user == usernameStored && pass == passwordStored{
print("Good")
let vc = self.storyboard?.instantiateViewController(withIdentifier: "home")
self.present(vc!, animated: true, completion: nil)
}
From your code, this is not segue by programmatically. You actually present a viewController on top of whatever you have. Therefore the tabBarController is cover.
To use segue in code, it should be something like this. - homeSegueID is the identifier you give when you created the segue in storyboard.
performSegue(withIdentifier: "homeSegueID", sender: nil)
If you just want to do it programatically without segue, you could do this instead. (This assume your current ViewController is in a UINavigationController stack.
navigationController?.pushViewController(vc, animated: true)
Is the navigation controller wrapping your view controllers a tab bar controller, or did you just add the tab bar to your view controller? This is what you should be doing:
Currently making an app in swift where all elements are added programatically. how can i add segue programmatically for the action of a given button to switch from one view to the next?
Instead of creating segues programmatically, you can use this inside button action to navigate to another view controller.
let viewController = MyViewController()
self.navigationController?.pushViewController(viewController, animated: true)
You can push to your next viewcontroller without using segue as well like.
#IBAction func btnClickNextVC(_ sender: Any) {
let objSecondVc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController2") as? ViewController2
self.navigationController?.pushViewController(objSecondVc!, animated: true)
//or you can use
present(objSecondVc, animated: true, completion: nil)
}
Note: Don't forget to take navigationcontroller in storyboard.
and give storyboard identifier of your viewcontroller same as you pass here in the code withidentifier.
I have two UINavigationController.
The second UINavigationController is segue from the first one.
How do I go back to the initial View.
Below is the storyboard.
note: The root view of the initial NavigationController is has a container from which is am performing segue
#IBAction func dismissView(){
self.dismissViewControllerAnimated(true, completion: nil)
}