Ios 如何在同一视图控制器（swift 3）上分割文本字段

我有两个文本字段。我希望在文本字段a中输入的内容显示在文本字段b中。但是，文本字段b仅用于显示。用户只能在文本字段a中输入名称。用户在文本字段a中输入一个名称，它将显示在文本字段b中

    import UIKit

class ViewController: UIViewController {

@IBOutlet var a: UITextField!
@IBOutlet var b: UITextField!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    b.isEnabled = false



}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}}

---

您可以使用textfield的委托方法，如“textfieldEndEditing”或“textfieldShouldChangeCharacterinrange”，在该委托方法中，您可以设置textfield b的文本。第二件事，如果你只想显示文本，那么你也可以使用uilable而不是textfield b

import UIKit

class ViewController: UIViewController {
@IBOutlet weak var a: UITextField!
@IBOutlet weak var b: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    b.isEnabled = false
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

// use extensions your code will be clear always 
// UITextfield delegate
extension ViewController: UITextFieldDelegate {
func textFieldDidEndEditing(_ textField: UITextField) {
    // if you have many textfields and the user dismissed the keyboard or tapped any other textfield
    if textField === a {
        b.text = textField.text
    }
}

// if the user clicked the return key in keyboard
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    // this works if you have only a and b textfields
    // b.text = textField.text

    // use this if statment if you have many text fields
    if textField === a {
        b.text = textField.text
    }
    return true
}

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    // if you want to see your text changes live as soon as the user clicks any button
    b.text = textField.text

    return true
  }

}

---

不要忘记将文本字段连接到脚本或nib中的委托，无论您使用什么

我如何在“将其放入视图”加载中编写一个不需要按下按钮的函数。函数a中的任何内容都将自动显示在函数b中。我不完全理解您的问题，但您可以轻松地在函数之间传递数据