textField 到 LabelView 由 swift 2 [重复]答案

【问题标题】：textField to LabelView live by swift 2 [duplicate]textField 到 LabelView 由 swift 2 [重复]
【发布时间】：2016-06-03 22:52:01
【问题描述】：

我在 textField 中输入的内容如何在没有按钮的情况下立即在 labelView 中显示？

导入 UIKit

类视图控制器：UIViewController {

@IBOutlet weak var labelView: UILabel!
@IBOutlet weak var textViewout: UITextField!

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

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

}

}

【问题讨论】：

标签： swift label textfield

【解决方案1】：

最好使用UITextField的delegate：

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var labelView: UILabel!
    @IBOutlet weak var textViewout: UITextField!

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

    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        labelView.text = textViewout.text
        return true
    }

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

    }
}

编辑：

抱歉，这实际上并不是最好的解决方案。它会被延迟。这应该对您更有效：

class ViewController: UIViewController {

    @IBOutlet weak var labelView: UILabel!
    @IBOutlet weak var textViewout: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        textViewout.addTarget(self, action: "updateLabel", forControlEvents: .EditingChanged)
    }

    func updateLabel() {
        labelView.text = textViewout.text
    }

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

    }
}

【讨论】：