I'm looking for some help with a UI related issue that I'm stumped with. I have a storyboard in my application that has a specific scene that looks like this:
The image above is where I've hacked the code so that it doesn't shift the view up when the keyboard comes up. But, as you can see, it's cutting off some of the objects in the view at the bottom.
I'm hoping to be able to slide all of the view objects up when the keyboard comes up, but keep the red banner stuck at the top and have it hover on top of the other items.
Here's the relevant code where the class responds to the keyboard being shown/hidden. This is not code I wrote as I'm working with a brand new codebase.
@objc
func keyboardWillShow(note: Notification) {
//print("**** EnterPasscodeViewController -> keyboardWillShow...")
if let userInfo = note.userInfo,
let keyboardSize = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
//Taking space from origin to move as this view is already drawn with layouts and completely visible to user.
let viewItemsHeight = forgotPasscodeButton.frame.origin.y
//Adding some buffer becasue of devices like iphone 5
let deltaY = view.frame.height - viewItemsHeight - keyboardSize.height + 24.0
if let navigationControllerBar = self.navigationController?.navigationBar {
let excessHeightAboveView = navigationControllerBar.frame.height + UIApplication.shared.statusBarFrame.height
view.frame.origin.y = deltaY > excessHeightAboveView ? excessHeightAboveView : deltaY
print("**** EnterPasscodeViewController -> keyboardWillShow -> new y position is \(self.view.frame.origin.y)")
}
}
}
@objc
func keyboardWillHide(note: Notification) {
//print("**** EnterPasscodeViewController -> keyboardWillHide...")
guard let height = self.navigationController?.navigationBar.frame.height else { return }
self.view.frame.origin.y = height + UIApplication.shared.statusBarFrame.height
print("**** EnterPasscodeViewController -> keyboardWillHide -> new y position is \(self.view.frame.origin.y)")
}
deinit {
unsubscribeToKeyboardNotifications()
}
func subscribeToKeyboardNotifications() {
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(keyboardWillShow(note:)), name: UIResponder.keyboardWillShowNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(keyboardWillHide(note:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}
func unsubscribeToKeyboardNotifications() {
let notificationCenter = NotificationCenter.default
notificationCenter.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
notificationCenter.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
}
Here is an image showing the storyboard's scene layout:
The "Error View" object in the scene is the red banner.
The ViewController is called EnterPasscodeViewController and subclasses UIViewController:
public final class EnterPasscodeViewController: UIViewController {
}
So, how can I float the red banner on top of the rest of the content when the keyboard shifts the view upwards?
