如何同时更改文本字段和标签中的文本 [英] How to change text in text field and label at the same time

问题描述

有人知道如何同时在 textField 和 label 上写消息吗?当我在 textField 写消息时，我想在标签上看到那个文本，一个字符一个字符，同时......

Anybody have idea how to write message at the textField and label at the same time? When I write message at the textField, I would like to see that text at the label, char by char, simultaneously....

是否有任何 UItextField 委托?

Is there any UItextField delegate for that?

推荐答案

我们可以将 SH_Kahn 展示的方法更进一步:

We can bring the approach SH_Kahn has shown a bit further:

import UIKit


extension UILabel {
    @objc
    func input(textField: UITextField) {
        self.text = textField.text
    }
}

我们添加了一个签名与添加目标机制兼容的方法.此方法只会获取 textField 的文本并将其设置为标签的文本.

We add a method with a signature compatible with the add target mechanism. This method just will get textField's text and set it to the label's text.

class ViewController: UIViewController {

    @IBOutlet weak var outputLabel: UILabel!
    @IBOutlet weak var inputField: UITextField!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.inputField.addTarget(outputLabel, action: #selector(UILabel.input(textField:)), for: .editingChanged)
    }


}

<小时>

但如果我们更频繁地需要它，我们可能希望让它更易于使用:

---

But if we need it more often, we might would like to make it even easier to use:

extension UILabel {
    @objc
    func input(textField: UITextField) {
        self.text = textField.text
    }

    func connect(with textField:UITextField){
        textField.addTarget(self, action: #selector(UILabel.input(textField:)), for: .editingChanged)
    }
}


class ViewController: UIViewController {

    @IBOutlet weak var outputLabel: UILabel!
    @IBOutlet weak var inputField: UITextField!
    override func viewDidLoad() {
        super.viewDidLoad()
        outputLabel.connect(with: inputField)
    }
}

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