BackButtonQRScannerView
struct BackButtonQRScannerView : ViewQR code Scanner view back button
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                  To dismiss the view. DeclarationSwift @Environment var presentationMode: Binding<PresentationMode> { get }ParameterspresentationModeThe presentation mode environment variable. 
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                  DeclarationSwift var body: some View { get }
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                  Dismisses the view. DeclarationSwift func dismissView()
