Close the keyboard on UITextField

问题

I'm a newbie developing for iOS devices. I inserted an UITextField on InterfaceBuilder, and I assigned with the code:

@interface ComposeViewController : UIViewController {
 id <ComposeViewControllerDelegate> delegate;
 IBOutlet UITextField *notificationTitle;
}

How I could allow to close the keyboard when the user press the "Return" key?

回答1:

Set the Delegate of the UITextField to your ViewController, add a referencing outlet between the File's Owner and the UITextField, then implement this method:

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

回答2:

Inherit UITextFieldDelegate protocol In viewDidLoad method set:

yourTextField.delegate = self

Implement the delegate method below:

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

回答3:

Inherit UITextFieldDelegate protocol and implement textFieldShouldReturn:, that's you will catch "return" event.

Inside textFieldShouldReturn write [notificationTitle resignFirstResponder];

回答4:

Add a action target to the event Did End on Exit(UIControlEventEditingDidEndOnExit), in the target function remove the first responder from the text filed using resignFirstResponder. Adding action target

Note: 1. Nib --- give action to even Did End on Exit 2. In code add target action to the event UIControlEventEditingDidEndOnExit.

来源：https://stackoverflow.com/questions/4761648/close-the-keyboard-on-uitextfield