I'm trying to update this code to swift 3:
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)`
So far, I've just tried the auto corrections given by the compiler. This results in code like this:
let notificationCenter = NotificationCenter.default()
notificationCenter.addObserver(self, selector: Selector(("keyboardWillShow:")), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
notificationCenter.addObserver(self, selector: Selector(("keyboardWillHide:")), name: NSNotification.Name.UIKeyboardWillHide, object: nil)`
Unfortunately, that doesn't take me far, resulting in additional errors.
Has anyone solved this please?
Please note that I'm just trying how to write the notifications. I'm not (yet) trying to fix the notification functions.. Thanks
Swift 4.2 Xcode 10 (10L213o)
The main changes compared with Swift 3 are in the UIWindow.keyboardWillShowNotification
and UIWindow.keyboardWillHideNotification
let notifier = NotificationCenter.default
notifier.addObserver(self,
selector: #selector(KeyboardLayoutConstraint.keyboardWillShowNotification(_:)),
name: UIWindow.keyboardWillShowNotification,
object: nil)
notifier.addObserver(self,
selector: #selector(KeyboardLayoutConstraint.keyboardWillHideNotification(_:)),
name: UIWindow.keyboardWillHideNotification,
object: nil)
@objc
func keyboardWillShowNotification(_ notification: NSNotification) {}
@objc
func keyboardWillHideNotification(_ notification: NSNotification) {}
Swift 4
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
func keyboardWillShow(notification: NSNotification) {
print("keyboardWillShow")
}
func keyboardWillHide(notification: NSNotification){
print("keyboardWillHide")
}
deinit {
NotificationCenter.default.removeObserver(self)
}
You can also get keyboard info using below code inside these methods.
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: .UIKeyboardWillChangeFrame, object: nil) .
@objc func keyboardWillChange(notification: NSNotification) {
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let curFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let targetFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = targetFrame.origin.y - curFrame.origin.y
}
I fixed this issue by writing the code like this
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
For Swift 4.2
.UIKeyboardWillShow
is renamed to UIResponder.keyboardWillShowNotification
and
.UIKeyboardWillHide
is renamed to UIResponder.keyboardWillHideNotification
NotificationCenter.default.addObserver(self, selector: #selector(NameOfSelector), name: UIResponder.keyboardWillShowNotification , object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(NameOfSelector), name: UIResponder.keyboardWillHideNotification , object: nil)
@objc func NameOfSelector() {
//Actions when notification is received
}
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