ios - ios键盘 "Go"按钮的 Action

Question

如何将操作绑定(bind)到 iOS 键盘的 Go 按钮？

Answer 1

objective-C

假设您使用的是 UITextField，您可以使用 <UITextFieldDelegate>方法 textFieldShouldReturn .

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder]; // Dismiss the keyboard.
    // Execute any additional code

    return YES;
}

不要忘记将您放入此代码的类指定为文本字段的委托(delegate)。

self.someTextField.delegate = self;

或者如果您更喜欢使用 UIControlEvents，您可以执行以下操作

[someTextField addTarget:self action:@selector(textFieldDidReturn:) forControlEvents:UIControlEventEditingDidEndOnExit];

- (void)textFieldDidReturn:(UITextField *)textField
{
    // Execute additional code
}

参见 @Wojtek Rutkowski's answer了解如何在 Interface Builder 中执行此操作。

swift

UITextFieldDelegate

class SomeViewController: UIViewController, UITextFieldDelegate {
    let someTextField = UITextField()

    override func viewDidLoad() {
        super.viewDidLoad()

        someTextField.delegate = self
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder() // Dismiss the keyboard
        // Execute additional code
        return true
    }
}

UIControlEvents

class SomeViewController: UIViewController {
    let someTextField = UITextField()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Action argument can be Selector("textFieldDidReturn:") or "textFieldDidReturn:"
        someTextField.addTarget(self, action: "textFieldDidReturn:", forControlEvents: .EditingDidEndOnExit)
    }

    func textFieldDidReturn(textField: UITextField!) {
        textField.resignFirstResponder()
        // Execute additional code
    }
}