如何在Swift中手动启用/禁用键盘返回键？

This question is not duplicated from these:

这个问题与以下问题不重复:

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

  如何在UITextField中禁用/启用返回键?

• How to enable or disable the keyboard return key

  如何启用或禁用键盘返回键

• Enable and Disable Keyboard return key on demand in iOS

  在iOS中按需启用和禁用键盘返回键

I have two TextFields.

我有两个TextFields。

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

• textField1 has the Next button like the Return Key;

  textField1具有Next键,如Return键;

• textField2 has the Go button like the Return Key;

  textField2像返回键一样有Go按钮;

textField1

textField2

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

我想在两个TextField都不为空的情况下启用第二个TextField的Go按钮。

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

我尝试使用TextFieldDelegate自动使用someTextField.enablesReturnKey,但是没有用。

Thank you for help.

谢谢你的帮助。

1 个解决方案

#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),

下面:只要textField1为空,textField2就会被禁用。如果后者非空,我们启用textField2,但仅当textField2非空(通过.enablesReturnKeyAutomatically属性)时才启用Go按钮,

/* 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:

运行如下: