UIControlClosureUseage.swift

let button = UIButton()
button.addAction(for: .touchUpInside) { (button) in
    // Run code
}

let slider = UISlider()
slider.addAction(for: .valueChanged) { (slider) in
    // Run code
}

let segmentedControl = UISegmentedControl()
segmentedControl.addAction(for: .valueChanged) { (segmentedControl) in
    // Run code
}