用swift编程语言隐藏文本字段的键盘

Question

I have little experience in Objective-C. I want to hide the keyboard for a text field using the Swift programming language.

I also tried this

func textFieldShouldReturn(textField: UITextField!) -> Bool // called when 'return' key pressed. return NO to ignore.
{
    return true;
}

But the method is not getting triggered when I hit return. Anyone have any luck with this?

Answer 1

I think the Problem is with setting the Delegate.

Please set textfield Delegate to your ViewController like this

class ViewController: UIViewController,UITextFieldDelegate {

and then create the IBOutlet for your text field like this

@IBOutlet var txtTest : UITextField = nil

make sure that it is connected to your text field on your view in storyboard.

finally set its Delegate using

txtTest.delegate=self

We are almost done. Now place this delegate function into your class.

func textFieldShouldReturn(textField: UITextField!) -> Bool // called when 'return' key pressed. return NO to ignore.
    {
        textField.resignFirstResponder()
        return true;
    }

Hope this will solve your issue.

Answer 2

Just override the UIViewController method called "touchesBegan" and set endEditing to true. Just like this:

override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
    self.view.endEditing(true)
}

Answer 3

In order to hide the keyboard when you pressed a button, you need to use the following function.

self.view.endEditing(true)

This works when a button is pressed.

Hope this helps someone out there.

Answer 4

Here we go:

1. Add a textField to your View
2. Create a new Swift file
3. Set this new file as a Class for that particular View
4. Add a TextField to your View
5. Create an Outlet for the textfield (my is named "txtField" !)

6. Substitute any code in the Swift Class file with this:

    import Foundation import UIKit //01 create delegation class MyViewController2: UIViewController,UITextFieldDelegate { @IBOutlet weak var txtField: UITextField!=nil override func viewDidLoad() { super.viewDidLoad() // additional setup after loading the view //02 set delegate to textfield txtField.delegate = self } //03 textfield func for the return key func textFieldShouldReturn(textField: UITextField) -> Bool { txtField.resignFirstResponder() return true; } //textfield func for the touch on BG override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { txtField.resignFirstResponder() self.view.endEditing(true) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() //dispose of any resources that can be recreated } }

   7. Try it out, be happy & say thanks !

Answer 5

Now In Swift 3/4/5, the easiest methods are

Method 1: called when 'return' key pressed.

func textFieldShouldReturn(_ textField: UITextField) -> Bool 
 {
 textField1.resignFirstResponder()
 textField2.resignFirstResponder()
        return true;
    }

Method 2: called when 'return' key pressed.

func textFieldShouldReturn(_ textField: UITextField) -> Bool 
    {
    self.view.endEditing(true)
        return true;
    }

Method 3: Global Method Write in view did load

self.view.addGestureRecognizer(UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:))))

Note: Don't forget to add this. Other wise its not work.

UIGestureRecognizerDelegate, UITextFieldDelegate

I hope it will work for you :)

Answer 6

In simple way to hide the keyboard just override the UIView "touchBegan method". So when you tap any where in the view keyboard is hide. here is the sample code.. (Swift 3.0 Updated code)

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
{
   self.view.endEditing(true)
}

Answer 7

Like @spfursich said, The best way is, when user touch anywhere above the keyboard the keyboard will disappear. Here is the code :

override func viewDidLoad() {
    super.viewDidLoad()

    var tap:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "DismissKeyboard")
    self.view.addGestureRecognizer(tap)
}

func DismissKeyboard(){
    self.view.endEditing(true)
}

Answer 8

• Add UITextFieldDelegate to the class declaration:

  class ViewController: UIViewController, UITextFieldDelegate

• Connect the textfield or write it programmatically

  @IBOutlet weak var userText: UITextField!

• set your view controller as the text fields delegate in view did load:

   override func viewDidLoad() { super.viewDidLoad() self.userText.delegate = self }

• Add the following function

  func textFieldShouldReturn(userText: UITextField!) -> Bool { userText.resignFirstResponder() return true; }

  with all this your keyboard will begin to dismiss by touching outside the textfield aswell as by pressing return key.

Answer 9

UIApplication.sharedApplication().sendAction(#selector(UIResponder.resignFirstResponder), to:nil, from:nil, forEvent:nil)

Answer 10

First you need to set delegate for your textfield then you need to include resignFirstResponder() to hide keyboard when press return button of keybaord.

 func textFieldShouldReturn(textField: UITextField!) -> Bool // called when 'return' key pressed. return NO to ignore.
 {
   textField .resignFirstResponder()
   return true;
 }

Answer 11

You can try this code to have the "return" key execute code.

func textFieldShouldReturn(textField: UITextField) -> Bool{
    textField.resignFirstResponder()
    performAction()
    return true;
}

func performAction(){

//execute code for your action inside this function

}

Hope this can help you.

Answer 12

You can also do like this: add event "Did end on exit" from connections inspector of your TextField and connect it to method from relevant ViewController

In my example I connect it to method called 'ended'

declare sender as UITextField and then call sender.resignFirstResponder(); Like this:

@IBAction func ended (sender: UITextField){ sender.resignFirstResponder(); }

Answer 13

Here i have solved the problem, that when keypad opens and the view gets hidden behind the keypad .... that time we need to change the UI constraints dynamically in order to make the whole view visible. In my case i am changing the bottonConstraint of the UITextField dynamically.

So, here goes the complete code. I have one UITextView and UITextField on UIViewController to work on for just testing...

import UIKit

class ViewController: UIViewController, UITextViewDelegate, UITextFieldDelegate {

    @IBOutlet weak var textView: UITextField!

    @IBOutlet weak var textField: UITextView!

      /*Height Constraint for textField*/
    @IBOutlet weak var bottom: NSLayoutConstraint!

    var defaultHeight:CGFloat = 0.0;

    override func viewDidLoad() {
        super.viewDidLoad()

        defaultHeight = bottom.constant;

        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil);


        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);

    }

    override func resignFirstResponder() -> Bool {
        textView.resignFirstResponder();
        textField.resignFirstResponder();
        return true;
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        resignFirstResponder()
        print("touched began")
    }

    func textViewDidEndEditing(textView: UITextView) {
        resignFirstResponder()
        print("text view did end editing")
    }

    func textViewShouldEndEditing(textView: UITextView) -> Bool {
        resignFirstResponder()
        print("text view should end editing")
        return true;
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        print("text field should return")
        resignFirstResponder()
        return true;
    }

    func textFieldDidEndEditing(textField: UITextField) {
        resignFirstResponder()
        print("did end editing")
    }

    func keyboardWillShow(notification: NSNotification) {
        print("keyboard will show.............")
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            let a = keyboardSize.height;
            self.bottom.constant = a + defaultHeight;
            self.view.updateConstraints();
        }
    }

    func keyboardWillHide(nofication:NSNotification)
    {
        print("keyboard will hide................")
        bottom.constant = defaultHeight;
        self.view.updateConstraints();

    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

Answer 14

when you call your UIAlertController, place condition in the completion handler if you'd like to hide the keyboard.

self.present('nameOfYourUIAlertController', animated: true, completion: {
    if condition == true {
        'nameOfYourUIAlertController'.textFields![0].resignFirstResponder()
    }
})

This works great for me.