Toggle in SwiftUI

Toggles are some of the most used UIControl in iOS Apps since it lets let you switch between a binary state - true or false, 0 or 1.

You are most likely to encounter a toggle in settings or some kind of list view. But regardless of your app has settings or not, it doesn't hurt to learn about Toggle in SwiftUI. Before diving into a toggle, let's take a look at Human Interface Guideline.

Note: This is UIKit equivalent of UISwitch

Takeaways from Human Interface Guideline

• Recommended to use it in table row only.
• Recommended not to add a lot of labels for description.
  Source

Basic Implementation

For you to implement a basic toggle, you require a binding boolean and a string that would label the string. Let's give it a try.

 @State var isOn = false // 1
    var body: some View {
        Toggle("Airplane Mode", isOn: $isOn) // 2
            .padding()
    }

Result:

Code Explanation:

1. Defining a bool variable isOn which is later used in the toggle init as a Binding.
2. Displaying a toggle with initialize of label and isOn.

In the case you are looking for a custom modifier, you can go for the init with label.

@State var isOn = false
    var body: some View {
        Toggle(isOn: $isOn, label: { // 1
            Label("Airplane Mode", systemImage: "airplane") // 2
        })
            .padding()
        
    }

Result:

Code Explanation:

1. Defining toggle with label init.
2. Using a Label with some relevant text and airplane SF symbol.

Styling appearance

You can apply all the style modifiers that are applicable to a SwiftUI view. But there are a couple of styles which are specific to button toggle.

Eventhough, there are a couple of style which are highlight worthy. One is to use a toggle style of button (by ButtonToggleStyle) and have a button that changes the background color based on the toggle state.

           Toggle(isOn: $isOn, label: {
            Label("Airplane Mode", systemImage: "airplane")
        })
            .toggleStyle(ButtonToggleStyle())
            .foregroundColor(.orange)
            .padding()
	

Result:

Another way, which is default and the one that you are most likely to encounter is the toggle switch way where there is a switch and you can turn it off and on.

		    Toggle(isOn: $isOn, label: {
            Label("Airplane Mode", systemImage: "airplane")
        })
            .toggleStyle(SwitchToggleStyle())
            .foregroundColor(.orange)
            .padding() 	

Result:

If you have a switch and you want to change the tint color, you can do it by using tint(...) for iOS 15 and later.

struct ToggleUI: View {
    @State var isOn = false
    var body: some View {
        Toggle(isOn: $isOn, label: {
            Label("Airplane Mode", systemImage: "airplane")
        })
            .toggleStyle(SwitchToggleStyle())
            .tint(.gray)
            .foregroundColor(.orange)
            .padding()
    }
}

Result:

For iOS 15 or earlier, you can use the following style modifier:

    .toggleStyle(SwitchToggleStyle(tint: .gray))

Concluding the article, today you learned about how to integrate a toggle switch in your app and you can customize it in form of a button and change the tint color.