ios - 在 Swift 中按下特定的键盘按钮

Question

是否可以在按下键盘上的特定按钮时调用函数？

如:

if (textField.spaceIsClicked){
  checkWords();
}

Answer 1

您可以这样使用 UITextFieldDelegate 的委托(delegate)函数 shouldChangeCharactersInRange:

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var textF: UITextField!
    override func viewDidLoad() {
        super.viewDidLoad()
        textF.delegate = self

    }
    func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
        if string == " " {
            //Run your function here
            println("SpaceBar is pressed")
        }
        return true
    }
}