如何在Swift中手动启用/禁用键盘Return键?

问题描述

• 如何在UITextField中禁用/启用返回键?

如何启用或禁用键盘返回键

>启用和禁用键盘返回键在iOS中按需

我有两个TextFields.

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

• textField1具有 Next 按钮，如Return键；

  • textField1 has the Next button like the Return Key;

    textField2具有 Go 按钮，如Return键；

    textField2 has the Go button like the Return Key;

    textField1

    textField2

    我想启用第二个TextField的 Go 按钮，即使两个TextField都不为空.

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

    我尝试将someTextField.enablesReturnKeyAutomatically与TextFieldDelegate一起使用，但是没有用.

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

    感谢您的帮助.

    推荐答案

    下图:textField2被禁用，只要textField1为空.如果后者为非空，则启用textField2，但是仅当textField2为非空(通过.enablesReturnKeyAutomatically属性)时，启用Go按钮

    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
        }
    }
    

    运行如下:

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