How could I enable / disable keyboard Return Key manually in Swift?

问题

This question is not duplicated from these:

How to disable/enable the return key in a UITextField?

How to enable or disable the keyboard return key

Enable and Disable Keyboard return key on demand in iOS

I have two TextFields.

@IBOutlet weak var textField1: UITextField!
@IBOutlet weak var textField2: UITextField!

textField1 has the Next button like the Return Key;
textField2 has the Go button like the Return Key;

textField1

textField2

I would like to enable the Go button of the second TextField just if both TextFields are not empty.

I tried to use someTextField.enablesReturnKeyAutomatically with TextFieldDelegate, but did not work.

Thank you for help.

回答1:

Below: textField2 is disabled as long as textField1 is empty. If the latter is non-empty, we enable textField2, but enable the Go button only if textField2 is non-empty (via .enablesReturnKeyAutomatically property),

/* ViewController.swift */
import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet weak var textField1: UITextField!
    @IBOutlet weak var textField2: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // text field delegates
        textField1.delegate = self
        textField2.delegate = self

        // set return key styles
        textField1.returnKeyType = UIReturnKeyType.Next
        textField2.returnKeyType = UIReturnKeyType.Go

        // only enable textField2 if textField1 is non-empty
        textField2.enabled = false

        // only enable 'go' key of textField2 if the field itself is non-empty
        textField2.enablesReturnKeyAutomatically = true
    }

    // UITextFieldDelegate
    func textFieldShouldReturn(textField: UITextField) -> Bool {

        if (textField1.text?.isEmpty ?? true) {
            textField2.enabled = false
            textField.resignFirstResponder()
        }
        else if textField == textField1 {
            textField2.enabled = true
            textField2.becomeFirstResponder()
        }
        else {
            textField.resignFirstResponder()
        }

        return true
    }
}

Runs as follows:

来源：https://stackoverflow.com/questions/35350243/how-could-i-enable-disable-keyboard-return-key-manually-in-swift

标签

ios

swift

keyboard

uitextfield