Add an accessory view above the keyboard. This is commonly used for adding next/previous buttons, or additional buttons like Done/Submit (especially for the number/phone/decimal pad keyboard types which don't have a built-in return key).
let textField = UITextField() // initialized however
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 0)
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil)
let doneButton = UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: Selector("done"))
let items = [flexibleSpace, doneButton] // pushes done button to right side
toolbar.setItems(items, animated: false) // or toolbar.items = ...
toolbar.sizeToFit()
textField.inputAccessoryView = toolbar
UITextField *textField = [[UITextField alloc] init];
UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 0)];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(done)];
NSArray *items = @[
flexibleSpace,
doneButton
];
[toolbar setItems:items];
[toolbar sizeToFit];
textField.inputAccessoryView = toolbar;