Segment Controls

1) Switch : 
step-1 : Put Switch Control and UITextfield on ViewController from object Library.
step-2 : Give meaningful Constraints on Switch and UITextfield.
step-3 : Give the IBoutlet of switch and UITextfield.
step-4 : Write following code in ViewDidLoad.

var icon_1 : Bool!

override func viewDidLoad() {

        super.viewDidLoad()

        switch_1.addTarget(self, action: #selector(stateChange), for: .valueChanged)

        icon_1 = true

        // Do any additional setup after loading the view, typically from a nib.

    }

Here, 'switch_1' is IBoutlet of switch, 'icon_1' is boolean variable and 'stateChange' is function.

step-5 : In stateChange function,

func stateChange(sender: UISwitch) {

        

        if icon_1 == true {

            txt_value.isSecureTextEntry = false

            icon_1 = false

        }

        else {

            txt_value.isSecureTextEntry = true

            icon_1 = true

        }

    }

Here, 'txt_value' is IBoutlet of UITextfield.

2) Segment Control : 

step-1 : Put Segment Control on ViewController from object Library.

step-2 : Give meaningful Constraints on Segment Control.
step-3 : Give IBoutlet and IBAction of Segment Control.
step-4 : Put following code in IBAction of Segment Control.

@IBAction func seg_click(_ sender: UISegmentedControl) {

        print(sender.selectedSegmentIndex)

    }

3) Slider :

step-1 : Put Slider on ViewController from object Library.

step-2 : Give meaningful Constraints on Slider.
step-3 : Give IBoutlet and IBAction of Slider.
step-4 : Put following code in IBAction of Slider.

@IBAction func slider_click(_ sender: UISlider) {

        let currentValue = Int(sender.value)

        lbl_display.text = "\(currentValue)"

    }

Here, 'lbl_display' is IBoutlet of UILabel.

4) Stepper :

step-1 : Put Stepper on ViewController from object Library.

step-2 : Give meaningful Constraints on Stepper.
step-3 : Give IBoutlet and IBAction of Stepper.

step-4 : Put following code in IBAction of Stepper.

@IBAction func stepper_click(_ sender: UIStepper) {

        lbl_stepper.text = Int(sender.value).description

    }

here,  lbl_stepper is IBoutlet of UILabel.

step-5 : Put following code in ViewDidLoad.

override func viewDidLoad() {

        super.viewDidLoad()

        

        stepper_1.wraps = true

        stepper_1.autorepeat = true

        stepper_1.maximumValue = 40

        // Do any additional setup after loading the view, typically from a nib.

    }

Thank you...