init()Creates an empty view.
Overview 概要
You will rarely, if ever, need to create an Empty directly. Instead, Empty represents the absence of a view.
SwiftUI uses Empty in situations where a SwiftUI view type defines one or more child views with generic parameters, and allows the child views to be absent. When absent, the child view’s type in the generic type parameter is Empty.
The following example creates an indeterminate Progress without a label. The Progress type declares two generic parameters, Label and Current, for the types used by its subviews. When both subviews are absent, like they are here, the resulting type is Progress, as indicated by the example’s output:
let progressView = ProgressView()
print("\(type(of:progressView))")
// Prints: ProgressView<EmptyView, EmptyView>