问题
I have UIViewController
which looks like this:
I set all the relevant constraints
.
I'm trying to shift the UIView
up when the keyboard shows up - when I click on the UITextfields
below.
I have the following code:
static func addRemoveKeyboardObserver(addObserver: Bool, keyboardMargin: CGFloat, view: UIView?)
{
Utils.keyboardMargin = keyboardMargin
Utils.heightChangingView = view
if addObserver
{
NotificationCenter.default.addObserver(self, selector: #selector(Utils.keyboardWillChange(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(Utils.keyboardWillChange(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(Utils.keyboardWillChange(notification:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
}
else
{
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
Utils.keyboardHeight = 0
}
}
@objc static func keyboardWillChange(notification: Notification)
{
let userInfo = notification.userInfo!
let beginFrameValue = (userInfo[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)!
let beginFrame = beginFrameValue.cgRectValue
let viewShouldMove = notification.name == UIResponder.keyboardWillShowNotification || notification.name == UIResponder.keyboardWillChangeFrameNotification
if Utils.keyboardHeight == 0 { Utils.keyboardHeight = -beginFrame.height + Utils.keyboardMargin }
let duration:TimeInterval = (userInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as? NSNumber)?.doubleValue ?? 0
let animationCurveRawNSN = userInfo[UIResponder.keyboardAnimationCurveUserInfoKey] as? NSNumber
let animationCurveRaw = animationCurveRawNSN?.uintValue ?? UIView.AnimationOptions.curveEaseInOut.rawValue
let animationCurve:UIView.AnimationOptions = UIView.AnimationOptions(rawValue: animationCurveRaw)
if let view = Utils.heightChangingView
{
view.frame.origin.y = viewShouldMove ? Utils.keyboardHeight : 0
UIView.animate(withDuration: duration, delay: TimeInterval(0), options: animationCurve, animations: { view.layoutIfNeeded() }, completion: nil)
}
}
The issue I'm facing is -
But then, when I click the second one, it shifts again, and now it looks like this:
I noticed that if I remove the constraints, the issue goes away, however, I do need to use the constraints.
So, what am I missing here?
回答1:
You must use scrollview for your uiview controller and then you can use notification for adjusting your uiview constraint.
Your UIViewController hierarchy should be like this
ContainerView --> ScrollView --> Content View --> Now Your View.
I'm suggesting you to use pod 'TPKeyboardAvoiding' for future animations in scrollview since for every controller you don't want to put notifications to shifting your UIView.
Here is link demo for your UIView shifting https://github.com/Vasu05/ScrollViewExample
来源:https://stackoverflow.com/questions/59300554/moving-keyboard-when-editing-multiple-textfields-with-constraints-swift