🅿️View

Views are copied frequently, two rules in mind when designing views:

Make initialization cheap.
Make body a pure function, free of side effects. Simply create your view and return, no dispatching extra work.

@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
public protocol View {

    /// inferred from implementation of `body`.
    associatedtype Body : View

    /// view body
    @ViewBuilder var body: Self.Body { get }
}

⭐️ 注意：.body 是一個 ViewBuilder❗( Swift 5.3 ) ️👉 Paul

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Last updated 4 years ago