swift Swift - 修复键盘隐藏UITextFieldimport UIKit类WelcomeViewController:UIViewController,UITextFieldDeleg
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// http://www.swiftexample.info/snippet/swift/movekeyboardupswift_marquavious_swift
// https://stackoverflow.com/questions/30918732/how-to-determine-which-textfield-is-active-swift
01. Add your textfields,create outlets, and set tag property to 1 for those text fields that
would be hidden by the keyboard.
02. Embed the fields in a stackview and pin this to the safe edges of the screen.
03. Add UITextFieldDelegate to your class
04. In func setTextFieldDelegates(), enable delegation to all UITextFields
import UIKit
class WelcomeViewController: UIViewController, UITextFieldDelegate {
var activeTextField = UITextField() //Create variable to hold the currently active UITextField. It is set in func textFieldDidBeginEditing
@IBOutlet weak var userIdTextField: UITextField!
@IBOutlet weak var emailTextField: UITextField!
@IBOutlet weak var pwdTextField: UITextField!
@IBOutlet weak var pwdChkTextField: UITextField!
@IBOutlet weak var registerBtn: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
setTextFieldDelegates() //Set all UITextField delegates
self.hideKeyboardWhenTappedAround() //Add recognizer to hide keyboard with user taps outside of field with input
addObserverToKeyboard() //Add observers to signal when keyboard shows and hides
}
// MARK: Remove all observers before closing
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
NotificationCenter.default.removeObserver(self)
}
}
extension WelcomeViewController {
// MARK: Textfield - Setup delegation for every UITextfield
func setTextFieldDelegates() {
userIdTextField.delegate = self
emailTextField.delegate = self
pwdTextField.delegate = self
pwdChkTextField.delegate = self
}
// MARK: Textfields - Assign the newly active textField to the activeTextField variable
func textFieldDidBeginEditing(_ textField: UITextField) {
self.activeTextField = textField
print ("Boom")
}
// MARK: Add observers to signal when keyboard shows and hides
func addObserverToKeyboard(){
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
// MARK: Check if activeTextField tag property is > 0 and if so, move the superview up.
@objc func keyboardWillShow(notification: NSNotification) {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
if activeTextField.tag > 0 {
self.view.frame.origin.y -= keyboardSize.height
}
}
}
// MARK: Reset the superview that was scrolled up (or not) to x,y origins of 0,0
@objc func keyboardWillHide(notification: NSNotification) {
if let _ = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
self.view.frame.origin.y = 0.0
}
}
// MARK: Add recognizer to hide keyboard with user taps outside of field with input
func hideKeyboardWhenTappedAround() {
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.dismissKeyboard))
tap.cancelsTouchesInView = false
view.addGestureRecognizer(tap)
}
@objc func dismissKeyboard() {
view.endEditing(true)
}
}
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