No more checking for keyboard notifications and parsing keyboard apperance info manually!

A small (but cool) tool for handling UIKeyboard appearing and disappearing in your view controllers.

github "nodes-ios/KeyboardHelper" ~> 3.0.0

pod 'KeyboardHelper', '~> 3.0.0'

Older versions

Last versions compatible with lower Swift versions:

Swift 4: ~> 2.0.0
Swift 3: == 1.2.1
Swift 2.3: == 0.10.0
Swift 2.2: == 0.9.4

Implement KeyboardHelperDelegate in your UIViewController.

class ViewController: UIViewController, KeyboardHelperDelegate

Add a KeyboardHelper private variable, initialize it and set the delegate.

private var keyboardHelper : KeyboardHelper?

func viewDidLoad() {
	...
	self.keyboardHelper = KeyboardHelper(delegate: self)
	...
}

Implement the two methods in the KeyboardHelperDelegate:

public func keyboardWillAppear(_ info: KeyboardHelper.KeyboardAppearanceInfo)
public func keyboardWillDisappear(_ info: KeyboardHelper.KeyboardAppearanceInfo)

Both methods take as argument a KeyboardAppearanceInfo object, which is basically a wrapper over the userInfo dictionary of the UIKeyboardWillShowNotification and UIKeyboardWillHideNotification notifications.

One example of implementation for the two delegate methods is:

func keyboardWillAppear(_ info: KeyboardAppearanceInfo) {
        UIView.animate(withDuration: TimeInterval(info.animationDuration),
            delay: 0,
            options: info.animationOptions,
            animations: {
                let insets = UIEdgeInsetsMake(0, 0, info.endFrame.size.height, 0)
                self.scrollView.contentInset = insets
                self.scrollView.scrollIndicatorInsets = insets
            },
            completion: nil)
    }
    
func keyboardWillDisappear(_ info: KeyboardAppearanceInfo) {
    UIView.animate(withDuration: TimeInterval(info.animationDuration),
        delay: 0,
        options: info.animationOptions,
        animations: {
            let insets = UIEdgeInsetsZero
            self.scrollView.contentInset = insets
            self.scrollView.scrollIndicatorInsets = insets
        },
        completion: nil)
}

The KeyboardAppearanceInfo object has the following properties:

• beginFrame: a CGRect corresponding to the value for UIKeyboardFrameBeginUserInfoKey
• endFrame : a CGRect corresponding to the value for UIKeyboardFrameEndUserInfoKey
• belongsToCurrentApp : a Bool corresponding to the value for UIKeyboardIsLocalUserInfoKey
• animationDuration : a Double corresponding to the value for UIKeyboardAnimationDurationUserInfoKey
• animationCurve : a UIViewAnimationCurve corresponding to the value for UIKeyboardAnimationCurveUserInfoKey
• animationOptions : a UIViewAnimationOptions from the value of UIKeyboardAnimationCurveUserInfoKey

KeyboardAppearanceInfo also has the convenience method animateAlong:completion:, which can be used like this:

func keyboardWillAppear(info: KeyboardAppearanceInfo) {
	info.animateAlong({ () -> Void in
            let insets = UIEdgeInsetsMake(0, 0, info.endFrame.size.height, 0)
            self.scrollView.contentInset = insets
            self.scrollView.scrollIndicatorInsets = insets
        })  { finished in }

to get the same effect as the initial keyboardWillAppear: implementation example above.

Made with ❤️ at Nodes.

KeyboardHelper is available under the MIT license. See the LICENSE file for more info.