swift - textField 到 LabelView live by swift 2

Question

我在textField中输入的内容如何立即在labelView中显示而无需按钮来执行此操作？

导入UIKit

ViewController 类: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.

}

}

Answer 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。会被推迟。这应该对您来说更有效:

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.

    }
}