How to show badge on List Row in SwiftUI

In iOS 15, we can add a badge to any List row with a badge(_:) modifier.

Badges in a List row appear on a trailing edge of a list row.

The following are examples of list row badges on the Reminders and Mail apps.

A badge conveys optional, supplementary information about a view.

In the above examples, badges represent an unread message and a number of to-do items.

How to add a badge to a List row

To add a badge to a list row, apply badge(_:) modifier to a list row view.

There are three ways to create a badge view.

1. Create with an integer
2. Create with a string
3. Create with a text view

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Create a badge from an integer

The first variation of a badge(_:) accept an integer value.

In this example, we put a number of unread emails as a badge value.

List {
    Text("All Inboxes")
        .badge(98)
    Text("iCloud")
        .badge(3)
    Text("Flagged")
        .badge(1335)
    
}

The default style of a badge on a list row is a grayish text that sits on a trailing edge of a list row content.

To hide a badge that initializes with an integer, you set the value to zero to hide the badge.

List {
    Text("All Inboxes")
        // 1
        .badge(0)
    Text("iCloud")
        .badge(3)
    Text("Flagged")
        .badge(1335)            
}

1 Setting zero value, .badge(0), will hide the badge.

Create a badge from a string

Not all information can be represented as a number.

The badge(_:) modifier also support creating a badge from a string.

We can use a string to initialize a badge the same way we did with an integer. But instead of an integer, we populate it with a string.

List {
    Text("Battery Health")
        .badge("90%")
    Text("Low Power Mode")
        .badge("Off")
}

To hide a badge that initializes with a string, you set the value to nil to hide the badge.

struct ContentView: View {
    @State var selectedColorIndex = 2
    
    var body: some View {
        List {
            Text("Red")
                .badge(selectedColorIndex == 0 ? "Selected": nil)
            Text("Blue")
                .badge(selectedColorIndex == 1 ? "Selected": nil)
            Text("Green")
                .badge(selectedColorIndex == 2 ? "Selected": nil)
        }
    }
}

In the above example, we present a badge with "Selected" text for a selected row and hide the rest by returning nil.

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Create a badge from a Text view

The List row badge might seem dull, but it doesn't need to be that way.

We can customize your badge with the final badge(_:) modifier variation, which accepts a Text view.

We can style an input text view the way you want. In this example, I tried foregroundColor, bold, italic, and string interpolation.

List {
    Text("Urgent")
        .badge(
            // 1
            Text("21")
                .foregroundColor(.red)
                .bold()
        )
    Text("Preferred Language")
        .badge(
            // 2
            Text("\(Image(systemName: "swift"))")
                .foregroundColor(.orange)
        )
    Text("Completed")
        .badge(
            // 3
            Text("1 out of 10")
                .italic()
        )
}

1 We use foregroundColor and bold to style the badge view.
2 We can show SF Symbols on a badge using string interpolation.
3 We use italic to style our last badge view.

We hide the badge the same way we did with a string. We set the value to nil to hide the badge.