Switch

The switch can be defined as the UIControl, which provides binary choices to the user either on or off. The state of a switch is managed by properties and methods defined in the UISwitch class, which is the subclass of UIControl.

The UISwitch class is declared as follows.

A switch can have only one state at once, either on or off. When the user tries to change the state of the switch, the valueChanged event is generated, and an action call is sent to the action connection associated with the swift.

We can customize the appearance of the swift by using the properties defined in the UISwitch class.

A switch can be added to the interface using the following steps.

1. Create the object of the UISwitch class or search for it in the object library and drag the result to the storyboard builder.
2. Create an outlet of the switch in the ViewController class to customize its appearance at runtime.
3. Create an action connection method of the switch in the ViewController class, which can be called at runtime when the valueChanged event is triggered for the switch.

Example

Here, we will create a very simple example, in which we will maintain the state of the switch and create a function to which accepts the call back when the state of the switch is changed.

Interface Builder

In this example, we have created a very simple storyboard in which we have use the switch and the label. Here, we will use the label to show the state of the switch, whether it is on or off. The label and switch are connected to the outlets in the ViewController.swift file.

ViewController.swift

Output: