KeyboardNotification 解决软键盘遮挡问题
2022-01-11 本文已影响0人
_浅墨_
import UIKit
class AddTaskViewController: UIViewController {
@IBOutlet weak var navigationBar: UINavigationBar!
@IBOutlet weak var taskNameTextField: UITextField!
@IBOutlet weak var taskDetailsTextView: UITextView!
@IBOutlet weak var taskCompletionDatePicker: UIDatePicker!
@IBOutlet weak var scrollView: UIScrollView!
lazy var touchView: UIView = {
let _touchView = UIView()
_touchView.backgroundColor = UIColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 0)
let touchViewTapped = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
_touchView.addGestureRecognizer(touchViewTapped)
_touchView.isUserInteractionEnabled = true
_touchView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
return _touchView
}()
let toolBarDone = UIToolbar.init()
var activeTextField: UITextField?
var activeTextView: UITextView?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let navigationItem = UINavigationItem(title: "Add Task")
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelButtonDidTouch))
navigationBar.items = [navigationItem]
taskDetailsTextView.layer.borderColor = UIColor.lightGray.cgColor
taskDetailsTextView.layer.borderWidth = CGFloat(1)
taskDetailsTextView.layer.cornerRadius = CGFloat(3)
toolBarDone.sizeToFit()
toolBarDone.barTintColor = UIColor.red
toolBarDone.isTranslucent = false
let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: self, action: nil)
let barBtnDone = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(doneButtonTapped))
barBtnDone.setTitleTextAttributes([NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 17), NSAttributedString.Key.foregroundColor: UIColor.white], for: .normal)
toolBarDone.items = [flexSpace, barBtnDone, flexSpace]
taskNameTextField.inputAccessoryView = toolBarDone
taskDetailsTextView.inputAccessoryView = toolBarDone
taskNameTextField.delegate = self
taskDetailsTextView.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
registerForKeyboardNotification()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
deregisterFromKeyboardNotification()
}
func registerForKeyboardNotification() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasShown(notification:)), name: UIWindow.keyboardDidShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWasHidden(notification:)), name: UIWindow.keyboardWillHideNotification, object: nil)
}
func deregisterFromKeyboardNotification() {
NotificationCenter.default.removeObserver(self, name: UIWindow.keyboardDidShowNotification, object: nil)
NotificationCenter.default.removeObserver(self, name: UIWindow.keyboardWillHideNotification, object: nil)
}
@objc func keyboardWasShown(notification: NSNotification) {
view.addSubview(touchView)
let info: NSDictionary = notification.userInfo! as NSDictionary
let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
let contentInsets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 0.0, bottom: (keyboardSize!.height + toolBarDone.frame.size.height + 10.0), right: 0.0)
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
var aRect: CGRect = UIScreen.main.bounds
aRect.size.height -= keyboardSize!.height
if activeTextField != nil {
if (!aRect.contains(activeTextField!.frame.origin)) {
self.scrollView.scrollRectToVisible(activeTextField!.frame, animated: true)
}
}
else if activeTextView != nil {
let textViewPoint: CGPoint = CGPoint(x: activeTextView!.frame.origin.x, y: activeTextView!.frame.size.height + activeTextView!.frame.size.height)
if (aRect.contains(textViewPoint)) {
self.scrollView.scrollRectToVisible(activeTextView!.frame, animated: true)
}
}
}
@objc func keyboardWasHidden(notification: NSNotification) {
touchView.removeFromSuperview()
let contentInsets: UIEdgeInsets = UIEdgeInsets.zero
self.scrollView.contentInset = contentInsets
self.scrollView.scrollIndicatorInsets = contentInsets
self.view.endEditing(true)
}
@objc func dismissKeyboard() {
view.endEditing(true)
}
@objc func doneButtonTapped() {
view.endEditing(true)
}
@objc func cancelButtonDidTouch() {
dismiss(animated: true, completion: nil)
}
@IBAction func addTaskDidTouch(_ sender: Any) {
guard let taskName = taskNameTextField.text,
!taskName.isEmpty else {
reportError(title: "Invalid Task Name", message: "Task name is required")
return
}
if taskDetailsTextView.text.isEmpty {
reportError(title: "Invalid Task Details", message: "Task details are required")
return
}
let taskDetails: String = taskDetailsTextView.text
let completionDate: Date = taskCompletionDatePicker.date
if completionDate < Date() {
reportError(title: "Invalid Date", message: "Date must be in the future")
return
}
let toDoItem = ToDoItem(name: taskName, details: taskDetails, completionDate: completionDate)
let toDoDict: [String: ToDoItem] = ["Task": toDoItem]
//NotificationCenter.default.post(name: NSNotification.Name.init("com.todolistapp.addtask"), object: toDoItem)
NotificationCenter.default.post(name: NSNotification.Name.init("com.todolistapp.addtask"), object: nil, userInfo: toDoDict)
dismiss(animated: true, completion: nil)
}
func reportError(title: String, message: String) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
let okAction = UIAlertAction(title: "OK", style: .default) { (action) in
alert.dismiss(animated: true, completion: nil)
}
alert.addAction(okAction)
present(alert, animated: true, completion: nil)
}
}
extension AddTaskViewController: UITextFieldDelegate {
func textFieldDidBeginEditing(_ textField: UITextField) {
activeTextField = textField
}
func textFieldDidEndEditing(_ textField: UITextField) {
activeTextField = nil
}
}
extension AddTaskViewController: UITextViewDelegate {
func textViewDidBeginEditing(_ textView: UITextView) {
activeTextView = textView
}
func textViewDidEndEditing(_ textView: UITextView) {
activeTextView = nil
}
}
