来自字符串的快捷键路径

假设你有这样的东西,

struct foo {

var test: doo

}

struct doo {

var test: Int

}
 //How to use it 

    let doo = Doo(test: 10)
    let foo = Foo(test: doo)

    let mykeyPath = \Foo.test.test

    let result = foo[keyPath: mykeyPath]

    print(result)