SwiftUI如何动态添加VStack、HStack和List元素？

以VStack为例：

VStack {
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
}

我在VStack中添加了10个矩形。到目前为止，似乎没有问题： 

然而，我添加了另一个矩形，然后报告了一个错误：调用中的额外参数

    VStack {
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
    }

这意味着VStack、HStack和List的构造函数只能接受10个参数，因此我将策略更改为使用嵌套的VStack：

    VStack {
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        VStack {
            Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
            Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
        }
    }

这可以突破VStack只能有十个元素的限制，因此我编写了一个函数，根据用户输入动态增加矩形的总数：

private func createRectangles(rectCount: UInt) -> some View {
    func createRectangles(_ i: UInt) -> some View {
        if i <= rectCount {
            return VStack {
                Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
                createRectangles(i + 1)
            }
        } else {
            return VStack {
                Rectangle()
            }
        }
    }
    return createRectangles(1)
}

private func create矩形（rectCount:UInt）->一些视图{
func create矩形（i:UInt）->一些视图{
如果我这种情况下最简单的方法就是使用类型擦除，如下所示（使用Xcode 11.4/iOS 13.4测试）

private func create矩形（rectCount:UInt）->一些视图{
func create矩形（i:UInt）->一些视图{
如果我
private func createRectangles(rectCount: UInt) -> some View {
    func createRectangles(_ i: UInt) -> some View {
        if i <= rectCount {
            return AnyView(VStack {
                Rectangle().size(CGSize(width: 20, height: 20)).fill(Color.green).frame(width: 20, height: 20)
                createRectangles(i + 1)
            })
        } else {
            return AnyView(VStack {
                Rectangle()
            })
        }
    }
    return createRectangles(1)
}