In my app, I wanted a notification for UIResponder.keyboardWillShowNotification in order to update the y position of my text field. It was working prior to iOS 12; now, it is not called in one of my view controllers (it works for other ones).
Here is my code to do this:
#objc func keyboardWillShow(_ notification: Notification) {
print("keyboard will show 2")
guard let frameValue: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
return
}
let keyboardFrame = frameValue.cgRectValue
UIView.animate(withDuration: animationTime) {
self.addViewBottomConstraint.constant = keyboardFrame.size.height
self.view.layoutIfNeeded()
print("Bottom contraint height = \(self.addViewBottomConstraint.constant)")
}
}
#objc func keyboardWillHide(_ notification: Notification) {
UIView.animate(withDuration: animationTime) {
self.addViewBottomConstraint.constant = 0
self.view.layoutIfNeeded()
}
}
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}
Here, "keyboard will show 2" is not printed, but it is printed for other view controllers with the same notifications. Is there anything new in iOS 12 that caused this? Otherwise, is there a particular reason why it is not being called?
This can be related to simulator setup, see menu "Hardware > Keyboard > Connect Keyboard Hardware". If this option is ON, you will get UIKeyboardWillHideNotification, but never UIKeyboardWillShowNotification.
Related
I'm trying to update the constraints of my view when the keyboard appears and disappears
I have notifications for keyboardWillShow and keyboardWillHide and corresponding functions to call them:
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name:UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
#objc private func keyboardWillShow(notification: NSNotification) {
if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue {
let keyboardFrameEnd = keyboardFrame.cgRectValue
let convertedKeyboardFrameEnd = self.view.convert(keyboardFrameEnd, from: nil)
let intersection = convertedKeyboardFrameEnd.intersection(listView.frame)
if intersection.size.height > 0 {
self.listView.snp.makeConstraints { make in
make.top.leading.trailing.equalTo(0)
make.bottom.equalTo(-intersection.height)
}
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
}
}
#objc private func keyboardWillHide() {
self.listView.snp.makeConstraints { make in
make.edges.equalTo(0)
make.bottom.equalTo(0)
}
self.listView.setNeedsUpdateConstraints()
self.listView.updateConstraints()
self.view.setNeedsLayout()
self.view.layoutIfNeeded()
}
It seems that keyboardWillShow gets called and updates the size of my listView to be the visible size outside of the keyboard. However, keyboardWillHide gets called and it doesn't seem to update the bottom back to have value 0 so I end up with a case where my view is not resized back to its original size. Any ideas what might be wrong here?
In the app I am building I have a Textfield with a button at the bottom of my screen, and I want to animate them up when the keyboard appears.
For that I use this:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}
#objc func keyboardWillShow(notification: Notification) {
let keyboardSize = (notification.userInfo? [UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
let keyboardHeight = keyboardSize?.height
if #available(iOS 12.0, *) {
self.submitConstraint.constant = (keyboardHeight! - view.safeAreaInsets.bottom) + 10
}
else {
self.submitConstraint.constant = view.safeAreaInsets.bottom + 10
}
UIView.animate(withDuration: 0.5){
self.view.layoutIfNeeded()
}
}
#objc func keyboardWillHide(notification: Notification){
self.submitConstraint.constant = 34 // or change according to your logic
UIView.animate(withDuration: 0.5){
self.view.layoutIfNeeded()
}
}
but, then a part of the button gets hidden under the suggestions toolbar.
I have googled this, and I found this answer: How to get the height of the keyboard including suggestions bar in swift. I tried the answers, and it didn't work for me, a part of the button still is hidden under the suggestions bar.
Could anybody help me?
Thanks!
In my application I need to get keyboard size for after move the others components to correctly position, now i'm using that code to get height
let info:NSDictionary = aNotification.userInfo! as NSDictionary
let kbSize:CGSize = (info.object(forKey: UIResponder.keyboardFrameEndUserInfoKey)! as AnyObject).cgRectValue.size
print(kbSize.height)
In the first time when keyboard is open the result is 260.0, but this value is size default, without the suggestions/passwords bar height, when I click out and click in the input again the result is 304.0 the value I want...
How I can get 304 since the first click in the input?
You should be listening for changes in the keyboard's size and adjusting the rest of your content that way, since, as you found out, iOS keyboards can change size. You should subscribe to UIResponder.keyboardWillChangeFrameNotification and/or UIResponder.keyboardDidChangeFrameNotification which are notifications which trigger when the keyboard's frame will, or did, change. Here's an example of it in use:
// Somewhere in set up code
NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidChangeFrame),
name: UIResponder.keyboardDidChangeFrameNotification, object: nil)
// Function elsewhere in your class
#objc func keyboardDidChangeFrame(_ notification: Notification) {
guard let kbSize = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey]
as? CGRect else {
return;
}
// Use kbRect as you initially did
}
Note that you can use either the Will or the Did notifications depending on how you want the layout change to look. You can also query both UIResponder.keyboardFrameBeginUserInfoKey UIResponder.keyboardFrameEndUserInfoKey to get the keyboard frame before and after the size change, which may be useful if you want to animate your layout along with the keyboard.
You can try this;
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)
}
deinit {
NotificationCenter.default.removeObserver(UIResponder.keyboardWillShowNotification)
NotificationCenter.default.removeObserver(UIResponder.keyboardWillHideNotification)
NotificationCenter.default.removeObserver(UIResponder.keyboardWillChangeFrameNotification)
}
#objc func keyboardWillChange(notification: Notification) {
guard let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else { return }
if notification.name == UIResponder.keyboardWillChangeFrameNotification || notification.name == UIResponder.keyboardWillShowNotification {
view.frame.origin.y = -keyboardSize.height
} else {
view.frame.origin.y = 0
}
}
}
HERE is the Github gist
I have a view which is resize a constraint when the keyboard appear. So I have notifications when the keyboard appears and disappears.
The above behaviour occurs when the keyboard is already shown and I rotate the screen. Then the next actions occurs:
UIKeyboardWillHideNotification called
UIKeyboardWillShowNotification called (with the old height of the keyboard)
UIKeyboardWillShowNotification called (with the new height of the keyboard)
So, the updateView function receives first one height and later a different height. This results in a weird movements of the view adjusting twice the value.
override func viewDidLoad() {
super.viewDidLoad()
// Creates notification when keyboard appears and disappears
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
deinit {
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShow(notification: NSNotification) {
self.adjustingHeight(true, notification: notification)
}
func keyboardWillHide(notification: NSNotification) {
self.adjustingHeight(false, notification: notification)
}
private func adjustingHeight(show: Bool, notification: NSNotification) {
// Gets notification information in an dictionary
var userInfo = notification.userInfo!
// From information dictionary gets keyboard’s size
let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
// Gets the time required for keyboard pop up animation
let animationDurarion = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSTimeInterval
// Animation moving constraint at same speed of moving keyboard & change bottom constraint accordingly.
if show {
self.bottomConstraint.constant = (CGRectGetHeight(keyboardFrame) + self.bottomConstraintConstantDefault / 2)
} else {
self.bottomConstraint.constant = self.bottomConstraintConstantDefault
}
UIView.animateWithDuration(animationDurarion) {
self.view.layoutIfNeeded()
}
self.hideLogoIfSmall()
}
Finally I found the solution. When I get keyboardFrame, I was using UIKeyboardFrameBeginUserInfoKey which returns the frame of the keyboard before the animation begins. The correct way of do that is with UIKeyboardFrameEndUserInfoKeywhich returns the frame of the keyboard after the animation has completed.
let keyboardFrame: CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
I create notifications when the keyboard appears and disappears.
override func viewDidLoad() {
super.viewDidLoad()
// Creates notification when keyboard appears and disappears
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
override func viewWillDisappear(animated: Bool) {
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShow(notification: NSNotification) {
self.adjustingHeight(true, notification: notification)
}
func keyboardWillHide(notification: NSNotification) {
self.adjustingHeight(false, notification: notification)
}
private func adjustingHeight(show: Bool, notification: NSNotification) {
// Gets notification information in an dictionary
var userInfo = notification.userInfo!
// From information dictionary gets keyboard’s size
let keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
// Gets the time required for keyboard pop up animation
let animationDurarion = userInfo[UIKeyboardAnimationDurationUserInfoKey] as! NSTimeInterval
// Animation moving constraint at same speed of moving keyboard & change bottom constraint accordingly.
if !(show && self.bottomConstraint.constant != self.bottomConstraintConstantDefault) {
if show {
self.bottomConstraint.constant = (CGRectGetHeight(keyboardFrame) + self.bottomConstraintConstantDefault / 2)
} else {
self.bottomConstraint.constant = self.bottomConstraintConstantDefault
}
UIView.animateWithDuration(animationDurarion) {
self.view.layoutIfNeeded()
}
}
self.hideLogoIfSmall()
}
The strange behaviour occurs when the keyboard is already shown and I rotate the screen. Then the next actions occurs:
UIKeyboardWillHideNotification called
UIKeyboardWillShowNotification called (with the old height of the keyboard)
UIKeyboardWillShowNotification called (with the new height of the keyboard)
The result of this is that my view is not updated properly because the first time UIKeyboardWillShowNotification is called I receive a different height of the keyboard than the second time.
Finally I found the solution. When I get keyboardFrame, I was using UIKeyboardFrameBeginUserInfoKey which returns the frame of the keyboard before the animation begins. The correct way of do that is with UIKeyboardFrameEndUserInfoKeywhich returns the frame of the keyboard after the animation has completed.
let keyboardFrame: CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
Now UIKeyboardWillShowNotification is called twice but returns the same height of the keyboard in both calls.