Action of the "Go" button of the ios keyboard

Objective-C

Assuming you're using a UITextField, you could use the <UITextFieldDelegate> method textFieldShouldReturn.

- (BOOL)textFieldShouldReturn:(UITextField *)textField{    [textField resignFirstResponder]; // Dismiss the keyboard.    // Execute any additional code    return YES;}

Don't forget to assign the class you put this code in as the text field's delegate.

self.someTextField.delegate = self;

Or if you'd prefer to use UIControlEvents, you can do the following

[someTextField addTarget:self action:@selector(textFieldDidReturn:) forControlEvents:UIControlEventEditingDidEndOnExit];- (void)textFieldDidReturn:(UITextField *)textField{    // Execute additional code}

See @Wojtek Rutkowski's answer to see how to do this in Interface Builder.

Swift

UITextFieldDelegate

class SomeViewController: UIViewController, UITextFieldDelegate {    let someTextField = UITextField()    override func viewDidLoad() {        super.viewDidLoad()        someTextField.delegate = self    }    func textFieldShouldReturn(textField: UITextField) -> Bool {        textField.resignFirstResponder() // Dismiss the keyboard        // Execute additional code        return true    }}

UIControlEvents

class SomeViewController: UIViewController {    let someTextField = UITextField()    override func viewDidLoad() {        super.viewDidLoad()        // Action argument can be Selector("textFieldDidReturn:") or "textFieldDidReturn:"        someTextField.addTarget(self, action: "textFieldDidReturn:", forControlEvents: .EditingDidEndOnExit)    }    func textFieldDidReturn(textField: UITextField!) {        textField.resignFirstResponder()        // Execute additional code    }}

You can connect UITextFiled event Did End On Exit in Connections Inspector. It is triggered after tapping Go / Return / whatever you choose as Return Key in Attributes Inspector.