在SwiftUI中将视图强制置于视图的右下角

extension HorizontalAlignment {
    private enum RightAlignmentGuide: AlignmentID {
        static func defaultValue(in context: ViewDimensions) -> CGFloat {
            context[HorizontalAlignment.trailing]
        }
    }
    
    static let rightAlignmentGuide = HorizontalAlignment(RightAlignmentGuide.self)
}

extension VerticalAlignment {
    private enum BottomAlignmentGuide: AlignmentID {
        static func defaultValue(in context: ViewDimensions) -> CGFloat {
            context[VerticalAlignment.bottom]
        }
    }
    
    static let bottomAlignmentGuide = VerticalAlignment(BottomAlignmentGuide.self)
}

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Hello, SwiftUI!")
                .alignmentGuide(.rightAlignmentGuide) { dimensions in
                    dimensions.width // 将视图右对齐
                }
                .alignmentGuide(.bottomAlignmentGuide) { dimensions in
                    dimensions.height // 将视图下对齐
                }
            
            Spacer()
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}