Question

我怎么能在textField中输入什么，立即在labelView中显示它而没有按钮呢？

导入UIKit

类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.
}

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

}

}

Answer 1

最好使用UITextField＆＃39; 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.

    }
}

修改

对不起，它实际上并不是最好的解决方案。它会被推迟。这应该更有效地为您服务：

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. } }

textField到LabelView live by swift 2

1 个答案: