1

For example, in the following code, body property is declared like in protocol, declared but not defined.

@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
public struct List<SelectionValue, Content> : View where SelectionValue : Hashable, Content : View {

    /// Creates a list with the given content that supports selecting multiple
    /// rows.
    ///
    /// On iOS and tvOS, you must explicitly put the list into edit mode for
    /// the selection to apply. To do that, either add an ``EditButton`` to
    /// your user interface, or modify the ``EnvironmentValues/editMode``
    /// value directly.
    ///
    /// - Parameters:
    ///   - selection: A binding to a set that identifies selected rows.
    ///   - content: The content of the list.
    @available(watchOS, unavailable)
    public init(selection: Binding<Set<SelectionValue>>?, @ViewBuilder content: () -> Content)

    /// Creates a list with the given content that supports selecting a single
    /// row.
    ///
    /// On iOS and tvOS, you must explicitly put the list into edit mode for
    /// the selection to apply. To do that, either add an ``EditButton`` to
    /// your user interface, or modify the ``EnvironmentValues/editMode``
    /// value directly.
    ///
    /// - Parameters:
    ///   - selection: A binding to a selected row.
    ///   - content: The content of the list.
    @available(watchOS, unavailable)
    public init(selection: Binding<SelectionValue?>?, @ViewBuilder content: () -> Content)

    /// The content of the list.
    public var body: some View { get }

    /// The type of view representing the body of this view.
    ///
    /// When you create a custom view, Swift infers this type from your
    /// implementation of the required ``View/body-swift.property`` property.
    public typealias Body = some View
}

When I do this, the code won't compile, for example:

struct TestStruct {
	var body: String {get}
}

Thanks.

2

Oh, I probably got it. Maybe the SwitfUI code XCode shows is just 'header files' and not complete. Is this right?

4 Likes
3

Yep, exactly.

1 Like
4

Thank you. :)

5

The official term for this is “interface file”. Xcode can generate interface files for your own code if you follow these steps. :)

2 Likes
6

Thank you. This is really helpful :heart:

1 Like