Extract function

private func setupUI() {
    // ...
    // This code will be extracted to a method
    self.buttonLogin.layer.borderColor = UIColor.black.cgColor
    self.buttonLogin.layer.borderWidth = 1.0
    self.buttonLogin.setTitleColor(UIColor.black, for: .normal)
    self.buttonLogin.setTitle("Login", for: .normal)
}

private func setupUI() {
    // ...
    // Extracted method's call
    setupLoginButton()
}
// Extracted method
private func setupLoginButton() {
    self.buttonLogin.layer.borderColor = UIColor.black.cgColor
    self.buttonLogin.layer.borderWidth = 1.0
    self.buttonLogin.setTitleColor(UIColor.black, for: .normal)
    self.buttonLogin.setTitle("Login", for: .normal)
}

- (void)setupUI {
    // ...
    // This code will be extracted to a method
    self.buttonLogin.layer.borderColor = [[UIColor blackColor] CGColor];
    self.buttonLogin.layer.borderWidth = 1.0;
    [self.buttonLogin setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [self.buttonLogin setTitle:@"Login" forState:UIControlStateNormal];
}

- (void)setupUI {
    // ...
    // Extracted method's call
    [self setupLoginButton];
}
// Extracted method
- (void)setupLoginButton {
    self.buttonLogin.layer.borderColor = [[UIColor blackColor] CGColor];
    self.buttonLogin.layer.borderWidth = 1.0;
    [self.buttonLogin setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [self.buttonLogin setTitle:@"Login" forState:UIControlStateNormal];
}