Get the frame of the keyboard dynamically - iphone

Question

Is it possible to get the frame, actually its height, of the keyboard dynamically? As I have a UITextView and I would like to adjust its height according to the keyboard frame height, when the input method of the keyboard is changed. As you know, different input methods may have different keyboard frame height.

Answer 1

try this:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification
object:nil];
- (void)keyboardWasShown:(NSNotification *)notification
{
// Get the size of the keyboard.
CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
//Given size may not account for screen rotation
int height = MIN(keyboardSize.height,keyboardSize.width);
int width = MAX(keyboardSize.height,keyboardSize.width);
//your other code here..........
}
Tutorial for more information

Answer 2

Just follow this tutorial from Apple and you will get what you want. Apple Documentation. In order to determine the area covered by keyboard please refer to this tutorial.

Answer 3

For the Swift 3 users, the #Hector code (with some additions) would be:
In your viewDidLoad add the observer :
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidShow(_:)), name: .UIKeyboardDidShow , object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidHide(_:)), name: .UIKeyboardDidHide , object: nil)
Then implement those methods:
func keyboardDidShow(_ notification: NSNotification) {
print("Keyboard will show!")
// print(notification.userInfo)
let keyboardSize:CGSize = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue.size
print("Keyboard size: \(keyboardSize)")
let height = min(keyboardSize.height, keyboardSize.width)
let width = max(keyboardSize.height, keyboardSize.width)
}
func keyboardDidHide(_ notification: NSNotification) {
print("Keyboard will hide!")
}

Answer 4

You can add this code to the view which contains the text field in Swift 3. This will make the text field animate up and down with the keyboard.
private var keyboardIsVisible = false
private var keyboardHeight: CGFloat = 0.0
// MARK: Notifications
private func registerForKeyboardNotifications() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillBeHidden(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
private func deregisterFromKeyboardNotifications() {
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
// MARK: Triggered Functions
#objc private func keyboardWillShow(notification: NSNotification) {
keyboardIsVisible = true
guard let userInfo = notification.userInfo else {
return
}
if let keyboardHeight = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.height {
self.keyboardHeight = keyboardHeight
}
if !textField.isHidden {
if let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber,
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber {
animateHUDWith(duration: duration.doubleValue,
curve: UIViewAnimationCurve(rawValue: curve.intValue) ?? UIViewAnimationCurve.easeInOut,
toLocation: calculateTextFieldCenter())
}
}
}
#objc private func keyboardWillBeHidden(notification: NSNotification) {
keyboardIsVisible = false
if !self.isHidden {
guard let userInfo = notification.userInfo else {
return
}
if let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber,
let curve = userInfo[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber {
animateHUDWith(duration: duration.doubleValue,
curve: UIViewAnimationCurve(rawValue: curve.intValue) ?? UIViewAnimationCurve.easeInOut,
toLocation: calculateTextFieldCenter())
}
}
}
// MARK: - Helpers
private func animateHUDWith(duration: Double, curve: UIViewAnimationCurve, toLocation location: CGPoint) {
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationDuration(TimeInterval(duration))
UIView.setAnimationCurve(curve)
textField.center = location
UIView.commitAnimations()
}
private func calculateTextFieldCenter() -> CGPoint {
if !keyboardIsVisible {
return self.center
} else {
let yLocation = (self.view.frame.height - keyboardHeight) / 2
return CGPoint(x: self.center.x, y: yLocation)
}
}