Discussion 議論
When you implement a custom view, you must implement a computed body
property to provide the content for your view. Return a view that’s composed of built-in views that SwiftUI provides, plus other composite views that you’ve already defined:
struct MyView: View {
var body: some View {
Text("Hello, World!")
}
}
For more information about composing views and a view hierarchy, see Declaring a Custom View.