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import Foundation
import UIKit
class KeyboardController: NSObject {
var viewController: UIViewController
var constraint: NSLayoutConstraint
var isKeyboardHidden: Bool {
return constraint.constant == 0
}
// MARK: Life Cycle
init(viewController: UIViewController, constraint: NSLayoutConstraint) {
self.viewController = viewController
self.constraint = constraint
super.init()
self.setupKeyboardObservers()
}
// MARK: Setup
private func setupKeyboardObservers() {
self.setupKeyboardWillChangeObserver()
self.setupDismissKeyboardTapGestureRecognizer()
}
private func setupKeyboardWillChangeObserver() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(_:)), name: .UIKeyboardWillChangeFrame, object: nil)
}
private func setupDismissKeyboardTapGestureRecognizer() {
let tap = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
tap.delegate = self
viewController.view.addGestureRecognizer(tap)
}
// MARK: Private
func keyboardWillChange(_ notification: Notification) {
guard let info = notification.userInfo,
let keyboardFrameValue = info[UIKeyboardFrameEndUserInfoKey] as? NSValue else { return }
let keyboardFrame: CGRect = keyboardFrameValue.cgRectValue
constraint.constant = UIScreen.main.bounds.size.height - keyboardFrame.origin.y
if let duration = info[UIKeyboardAnimationDurationUserInfoKey] as? TimeInterval {
UIView.animate(withDuration: duration, animations: {
self.viewController.view.layoutIfNeeded()
})
} else {
self.viewController.view.layoutIfNeeded()
}
}
func dismissKeyboard() {
viewController.view.endEditing(true)
}
}
extension KeyboardController: UIGestureRecognizerDelegate {
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
return !isKeyboardHidden
}
}
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