CODEWITHSUNDEEP
iosswift
John Doe
John Doe

Reputation: 29

Type 'ChatViewController' has no member 'showOrHideKeyboard'

I can't seem to find the function I made.

Error: Type 'ChatViewController' has no member 'showOrHideKeyboard'

Code:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    NotificationCenter.defaultCenter.addObserver(self, selector: #selector(ChatViewController.showOrHideKeyboard(_:)), name: UIKeyboardWillShowNotification, object: nil)
    NotificationCenter.defaultCenter.addObserver(self, selector: #selector(ChatViewController.showOrHideKeyboard(_:)), name: UIKeyboardWillHideNotification, object: nil)
}

@IBOutlet weak var contraintToBottom: NSLayoutConstraint!

func showOrHideKeyboard(notification: NSNotification) {
    if let keyboardInfo: Dictionary = notification.userInfo {
        if notification.name == UIResponder.keyboardWillShowNotification {
            UIView.animate(withDuration: 1, animations: { () in
                self.contraintToBottom.constant = (keyboardInfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue.height
                self.view.layoutIfNeeded()
            }) { (completed: Bool) -> Void in
                //
            }
        }
    }
}

Upvotes: 1

Views: 90

Answers (4)

Kathiresan Murugan
Kathiresan Murugan

Reputation: 2962

Optimise your code like below

In ViewDidLoad()

[NSNotification.Name.UIKeyboardWillShow,
         NSNotification.Name.UIKeyboardWillHide].forEach { (notificationName) in
            NotificationCenter.default.addObserver(self, selector: #selector(notificationObservered(notification:)),
                                                   name: notificationName, object: nil)
        }

Create a function

// MARK: - Notification Observered
    /// Notification received
    @objc func notificationObservered(notification: NSNotification) {

        switch notification.name {
        case NSNotification.Name.UIKeyboardWillShow:
            break
        case NSNotification.Name.UIKeyboardWillHide:
            // let info = notification.userInfo!
            // let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
           break
        default:
            break
        }
    }

Upvotes: 0

Pablo Alegre
Pablo Alegre

Reputation: 37

It seems that #selector with function name but no arguments name "(_:)" is no longer supported in swift lastest versions.

Just replace fill the arg name or use autocomplete to type the declaration:

#selector(ViewController.showOrHideKeyboard(notification:)

Upvotes: 0

NeverHopeless
NeverHopeless

Reputation: 11233

Use either this:

@objc func showOrHideKeyboard(_ notification: NSNotification) 
#selector(ChatViewController.showOrHideKeyboard(_:))

Or:

@objc func showOrHideKeyboard(notification: NSNotification) {
#selector(ChatViewController.showOrHideKeyboard(notification:))

Notice the _ in function signature and #selector.

Upvotes: 0

iOS_Maccus
iOS_Maccus

Reputation: 397

You should mark the selector method with objc

Change this line 

func showOrHideKeyboard(notification: NSNotification) {
}

to this line

@objc func showOrHideKeyboard(_ notification: NSNotification) {
}

Upvotes: 2

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