How to add a ‘Done’ button to numpad keyboard in iOS

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The much safer approach is to use a UIToolBar with Done Button as inputAccessoryView.

Sample Code :

UIToolbar *keyboardDoneButtonView = [[UIToolbar alloc] init];
[keyboardDoneButtonView sizeToFit];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                               style:UIBarButtonItemStyleBordered target:self
                                                              action:@selector(doneClicked:)];
[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];
txtField.inputAccessoryView = keyboardDoneButtonView;

Your -doneClicked method should look like this :

- (IBAction)doneClicked:(id)sender
{
    NSLog(@"Done Clicked.");
    [self.view endEditing:YES];
}

Sample Code Swift:

let keyboardDoneButtonView = UIToolbar.init()
keyboardDoneButtonView.sizeToFit()
let doneButton = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonSystemItem.Done, 
                                                   target: self, 
                                                   action: Selector("doneClicked:")))    

keyboardDoneButtonView.items = [doneButton]
textFieldInput.inputAccessoryView = keyboardDoneButtonView

Your -doneClicked method should look like this :

func doneClicked(sender: AnyObject) {
  self.view.endEditing(true)
}

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