I have a view controller in a navigation controller. In viewDidLoad:
let button = UIButton()
button.setImage(Theme.Icon28.back.withRenderingMode(.alwaysTemplate), for: .normal)
button.addTarget(self, action: #selector(didTapBackButton), for: .touchUpInside)
button.imageEdgeInsets = Constants.buttonImageEdgeInsets
button.accessibilityIdentifier = "nav_btn_back"
navigationItem.leftBarButtonItem = button
This sets up my custom back button. Now I want to push a UIHostingController:
navigationController?.pushViewController(UIHostingController(rootView: SomeView()), animated: true)
With SomeView as:
struct SomeView: View {
var body: some View {
Text("Hello World")
}
}
Now when I push the UIHostingController the back button will change back to the default system back button, the leftBarButtonItem has lost my custom button. Has anyone else run into this issue?
Why is it overriding my custom button?
Related
I am trying to push to a new view controller when I click the quiz button I implemented. I set it up as below:
quizButton = UIButton()
quizButton.setTitle(" Quiz ", for: .normal)
quizButton.backgroundColor = .lightGray
quizButton.layer.cornerRadius = 9
quizButton.translatesAutoresizingMaskIntoConstraints = false
quizButton.addTarget(self, action: #selector(takeQuiz), for: .touchUpInside)
view.addSubview(quizButton)
and I defined the function takeQuiz as below, where there is a separate view controller called QuizViewController:
#objc func takeQuiz() {
let newViewController = QuizViewController()
navigationController?.pushViewController(newViewController, animated: true)
}
I'm not sure if it was necessary for me to use delegates here, since I am not trying to relay any information from one view controller to the other. Let me know, thanks in advance.
UIButton gestures doesn't recognize in child view controller.
UIButton add targer work (button get target action)
User interaction is turned on everywhere, button size is okay. I try to set childVC as main, and then all work good, debug view hierarchy said that button view over other elements. IDK where is problem. I can provide more code, just tell me.
Add target code:
view.buttonOfLanguageFromTranslate.addTarget(self, action: #selector(self.openDetailView(_:)), for: .touchDown)
Add child VC code:
let childVC = ChildVC()
view.addSubview(childVC.view)
self.addChild(childVC)
childVC.didMove(toParent: self)
childVC.view.translatesAutoresizingMaskIntoConstraints = false
self.view.isUserInteractionEnabled = true
self.childVC = childVC
Button initialization:
var button: UIButton = {
let button = UIButton()
button.setTitle("Title", for: .normal)
button.setTitleColor(.black, for: .normal)
button.setTitleColor(.green, for: .selected)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
The problem was with
childVC.translatesAutoresizingMaskIntoConstraints = false
(in mainVC)
When i remove it, childVC recognise my tap
and i dont set additional size for childVC, view of childVC is display correct but not childVC. (as i think)
Inside of my view controller I have a navBar with an item on the left side and right side. I also have 2 buttons inside of the view controller. I have it so each button does different functionality. I also have the swift file connected to the view.
My issue is that when I do either of the code below inside of my button actions the NavBar Items do not change. I don't know how to remove and add the item back, I also dont understand what Im doing wrong.
self.navigationItem.rightBarButtonItem?.isEnabled = false
self.navigationItem.rightBarButtonItem?.tintColor = UIColor.clear
self.navigationItem.rightBarButtonItem?.isEnabled = true
self.navigationItem.rightBarButtonItem?.tintColor = UIColor.red
Connect Navigation Bar from storyboard to View Controller Class
#IBOutlet var navBar: UINavigationBar!
This will hide Button
navBar.topItem?.rightBarButtonItem?.isEnabled = false
navBar.topItem?.rightBarButtonItem?.tintColor = UIColor.clear
This will show Button
navBar.topItem?.rightBarButtonItem?.isEnabled = true
navBar.topItem?.rightBarButtonItem?.tintColor = UIColor.red
Sorry, i can't make comment due to low reputetion. Which IDE are you using?
The answer of #dharmesh works, if you create the button programmatically:
let btn = UIButton(type: .system)
btn.setTitle("Indietro", for: btn.state)
btn.addTarget(self, action: #selector(annulla), for: .touchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: btn)
If you use the one from the IDE it depends on the IDE itself to store the values to hide or change it
Hello, I have provided the link above to show a visual view of what I am trying to accomplish. So each button is a segue to the next view except the last button is not which is intended. The last two views with the back buttons at the top that are automatically included because of the nav controller I want to have those back buttons go to the first view controller. How can I do this either with xcode and swift?
If you want to remove all the navigation controller then use this code
Put this code in the button selector method
self.navigationController!.viewControllers.removeAll()
OR
navigationController?.popToRootViewController(animated: true)
OR
If you don’t have a Navigation Controller and use dismissViewController method, you still can use:
view.window?.rootViewController?.dismiss(animated: true, completion: nil)
Now comes the back button code:
override func viewDidLoad() {
super.viewDidLoad()
var backbutton = UIButton(type: .Custom)
backbutton.setImage(UIImage(named: "BackButton.png"), forState: .Normal) // Any image can be used. download back button image from any site or whatever you wanna use.
backbutton.setTitle("Back", forState: .Normal)
backbutton.setTitleColor(backbutton.tintColor, forState: .Normal) // You can change the TitleColor
backbutton.addTarget(self, action: "backAction", forControlEvents: .TouchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: backbutton)
}
func backAction() -> Void {
//here put code from above whichever you wanna use for example I'm using one
self.navigationController?.popToRootViewController(animated: true)
}
I have a view in my tabbar controller where I would like to show a button. I create this button programmatically based of a condition, therefore I use the following code but nothing is appearing:
override func viewDidLoad() {
super.viewDidLoad()
if !Settings.getIsConnected() {
notConnected()
}
}
func notConnected() {
let connectBtn = UIButton(frame: CGRect(x: self.view.center.x, y: self.view.center.y, width: 200, height: 45))
connectBtn.setTitle("Connect", forState: .Normal)
connectBtn.addTarget(self, action:#selector(self.pressedConnect(_:)), forControlEvents: .TouchUpInside)
self.view.addSubview(connectBtn)
print("Button created")
}
func pressedConnect(sender: UIButton!) {
}
I am clueless on what I am doing wrong. Anyone got suggestions? Cause it does print out "Button created" so it definitely runs the code inside the noConnected() method.
Add a background color to your UIButton and add a tint color to the title. This will resolve the problem
Try moving the code to viewDidAppear and see if the button is showing up.
The frame is not correctly set when in viewDidLoad. Use the method viewDidLayoutSubviews for the earliest possible time where the frame is correctly setup for a ViewController.
With this code change, you will need some additional logic for when your button should be added as a subview though.
A programmatically created button may not show up because of more reasons, e.g:
the tint color is not set
the background color is not set
the button is not added to the view hierarchy
the button is hidden
In your case, you should change the tint color or the background color of your button.
E.g.:
Swift 4.2:
private lazy var connectButton: UIButton = {
let button = UIButton(type: .custom)
button.backgroundColor = .green
button.setTitleColor(.black, for: .normal)
button.setTitle(NSLocalizedString("Connect", comment: ""), for: .normal)
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(connectButton)
}
You can re-check the button properties in the storyboard that it is not hidden.