UITextField - capture return button event

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

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

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.