dismiss modal view with return key

I got one UITextField on my Modal view controller. When "Done" key is clicked, 开发者_Python百科i want to dismiss the modal view. i don't know where should i add below code to dismiss modal view. Thanks in advance for any help.

[self.parentViewController dismissModalViewControllerAnimated:YES];

add it in UITextFieldDelegate method

-(BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    [self.parentViewController dismissModalViewControllerAnimated:YES];
    return YES;
}