捕获返回按钮事件

如何检测用户在编辑 UITextField 时按下“返回”键盘按钮？我需要这样做，以解除键盘时，用户按下“返回”按钮。

谢谢。

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最佳答案

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return NO;
}

Don't forget to set the delegate in storyboard...

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Delegation is not required, here's a one-liner:

- (void)viewDidLoad {
[textField addTarget:textField
action:@selector(resignFirstResponder)
forControlEvents:UIControlEventEditingDidEndOnExit];
}

Sadly you can't directly do this in your Storyboard (you can't connect actions to the control that emits them in Storyboard), but you could do it via an intermediary action.

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- (BOOL)textFieldShouldReturn:(UITextField *)txtField
{
[txtField resignFirstResponder];
return NO;
}

When enter button is clicked then this delegate method is called.you can capture return button from this delegate method.

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SWIFT 3.0

override open func viewDidLoad() {
super.viewDidLoad()
textField.addTarget(self, action: #selector(enterPressed), for: .editingDidEndOnExit)
}

in enterPressed() function put all behaviours you're after

func enterPressed(){
//do something with typed text if needed
textField.resignFirstResponder()
}

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You can now do this is storyboard using the sent event 'Did End On Exit'.

In your view controller subclass:

 @IBAction func textFieldDidEndOnExit(textField: UITextField) {
textField.resignFirstResponder()
}

In your storyboard for the desired textfield:

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Swift version using UITextFieldDelegate :

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
resignFirstResponder()
return false
}

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Swift 5

textField.addTarget(textField, action: #selector(resignFirstResponder), for: .editingDidEndOnExit)