storyboard自行發揮摟～而我為了呈現會擋住textfield所以我故意放比較低
在這要比較注意的是，通常大多數會擋住textfield是因為沒有使用tableview
物件無法滑動的情況下就變成必須改變view的座標，但以下寫法並不適合過多欄位使用。
import UIKit
class ViewController: UIViewController ,UITextFieldDelegate{
@IBOutlet weak var ShowInputLabel: UILabel!
@IBOutlet weak var YouerTextField: UITextField!
@IBOutlet weak var AlertTextLabel: UILabel!
var singleFingerTap:UITapGestureRecognizer!
var alert:UIAlertController!
override func viewDidLoad() {
super.viewDidLoad()
self.YouerTextField.delegate = self
//鍵盤監聽
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWasShow), name: .UIKeyboardWillShow, object: nil);
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWasHidden), name: .UIKeyboardWillHide, object: nil);
singleFingerTap = UITapGestureRecognizer.init(target: self, action: #selector(handleSingleTap));
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
NotificationCenter.default.removeObserver(self)
// Dispose of any resources that can be recreated.
}
@IBAction func AlertBtn(_ sender: UIButton) {
alert = UIAlertController(title: "Alert", message: "輸入下方欄位", preferredStyle: .alert);
//加入textfield在alert中
alert.addTextField { (text:UITextField) in
text.placeholder = "輸入"
//監聽
NotificationCenter.default.addObserver(self, selector: #selector(ViewController.alertCheck(notification:)), name: .UITextFieldTextDidChange, object: text);
}
let alertAction = UIAlertAction(title: "OK", style: .default) { (UIAlertAction) in
self.AlertTextLabel.text = self.alert.textFields?.first?.text
//釋放間聽
NotificationCenter.default.removeObserver(self, name: .UITextFieldTextDidChange, object: nil);
}
alertAction.isEnabled = false//凍結OK
alert.addAction(alertAction)
self.present(alert, animated: true, completion: nil);
}
//凍結action（監控）
func alertCheck(notification:Notification){
alert = self.presentedViewController as! UIAlertController?
if(alert != nil){
let input = (alert.textFields?.first)! as UITextField
let alertActionOK = alert.actions.last! as UIAlertAction
//計算字元到多少未解凍
alertActionOK.isEnabled = (input.text?.characters.count)! > 5
}
}
@IBAction func OutPutBtn(_ sender: UIButton) {
ShowInputLabel.text = YouerTextField.text
}
//MARK: 鍵盤監聽動作（點view隱藏鍵盤）
//鍵盤顯示
func keyboardWasShow(notification:Notification){
self.view.addGestureRecognizer(singleFingerTap)
//獲取鍵盤高度
let info = notification.userInfo!
let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let hieght = keyboardFrame.height
//改變view座標避免鍵盤擋到textfield（注意：欄位多時不適用）
self.view.frame.origin.y = -hieght
}
//鍵盤收起
func keyboardWasHidden(notification:Notification){
self.view.removeGestureRecognizer(singleFingerTap)
self.view.frame.origin.y = 0
}
func handleSingleTap(){
YouerTextField.resignFirstResponder()
}
//MARK: 鍵盤按下return後的動作
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
if(textField.text != ""){
self.OutPutBtn(.init(type:.custom))
}
//假設如果有多個欄位要動作時
/*if(textField.isEqual("第一個欄位")){
YouerTextField.becomeFirstResponder()//第二個欄位
}else{
self.OutPutBtn(.init(type:.custom))
}*/
return true
}
}
出來的效果如圖：
