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| import UIKit | |
| class ViewController: UIViewController { | |
| /* | |
| Current active (firstRespounder) textField | |
| */ | |
| private weak var activeTextField: UITextField? | |
| /* | |
| local intance of KeyboardObserver | |
| */ | |
| private let keyboard = KeyboardObserver() | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| /* | |
| Setup `handler` into KeyboardObserver instance | |
| */ | |
| keyboard.handler = { | |
| [unowned self] state in | |
| switch state { | |
| case .show(let rect): | |
| /* | |
| Check if we already have an reference to textField which is editing | |
| */ | |
| guard let `activeTextField` = self.activeTextField else { | |
| return | |
| } | |
| /* | |
| Compute what dif between activeTextField.frame.maxY and keyboard.frame | |
| */ | |
| let y = self.view.bounds.height | |
| - rect.height | |
| - self.view.convert(activeTextField.frame, to: self.view).maxY | |
| if y > 0 { | |
| return | |
| } | |
| /* | |
| Move view to top on vertical dif | |
| */ | |
| self.view.transform = CGAffineTransform.identity.translatedBy(x: 0, y: y) | |
| default: | |
| /* | |
| Clear view transform | |
| */ | |
| self.view.transform = .identity | |
| /* | |
| Clear activeTextField as it no need after end editing. Keyboard already hidden | |
| */ | |
| self.activeTextField = nil | |
| } | |
| } | |
| /* | |
| Hide keyboard by tap on view | |
| */ | |
| view.addGestureRecognizer(UITapGestureRecognizer(target: view, action: #selector(UIView.endEditing(_:)))) | |
| } | |
| } | |
| // MARK: - UITextFieldDelegate | |
| extension ViewController: UITextFieldDelegate { | |
| func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool { | |
| /* | |
| Store textField reference to get an access later when keyboard is shown | |
| */ | |
| activeTextField = textField | |
| return true | |
| } | |
| func textFieldShouldReturn(_ textField: UITextField) -> Bool { | |
| if let nextTF = view.viewWithTag(textField.tag + 1) { | |
| activeTextField = nextTF as? UITextField | |
| nextTF.becomeFirstResponder() | |
| } else { | |
| /* | |
| Switch to next textField | |
| */ | |
| view.endEditing(true) | |
| } | |
| return true | |
| } | |
| } |
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