🔰init Binding

SwiftUIData FlowBinding ⟩ init

// custom control
struct SlidersForSize: View {
    @Binding var size: CGSize    // ⭐️ Binding variable
    var body: some View { ... }
}

extension SlidersForSize {
    init(_ size: Binding<CGSize>) {
        self._size = size        // ⭐️ 注意:不是 `self.size = size` ❗️❗️❗️
    }
}

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