SwiftUI 获取屏幕尺寸 GeometryReader

import SwiftUI

struct GeometryReaderView: View {
    var body: some View {
        GeometryReader(content: { geometry in
            VStack(content: {
                Rectangle().fill(Color.purple)
                .frame(width: geometry.size.width, height: geometry.size.height)
                
                Rectangle().fill(Color.blue)
                .frame(width: geometry.size.width, height: geometry.size.height)
            }).frame(width: geometry.size.width, height: geometry.size.height)
        })
    }
}

struct GeometryReaderView_Previews: PreviewProvider {
    static var previews: some View {
        GeometryReaderView()
    }
}