SwiftUI调整图片尺寸以适应屏幕尺寸

使用GeometryReader来获取

范例：

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VStack {
    GeometryReader { geo in
        Image("Example")
            .resizable()
            .aspectRatio(contentMode: .fit)
            .frame(width: geo.size.width, height: 300)
    }
}

实例：

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var body: some View {
    GeometryReader { geo in
        VStack {
            ZStack {
                Circle()
                    .frame(width: geo.size.width / 2, height: geo.size.width / 2)
                    .foregroundColor(.blue)
                    
                Text("?")
                    .foregroundColor(.white)
                    .font(.system(size: 60, weight: .bold, design: .default))
                
            }
                
            ForEach(0 ..< 3) { item in
                Circle()
                    .frame(width: geo.size.width / 4, height: geo.size.width / 4)
            }
        }
    }
        
}