ios - 无法在深度嵌套的数据结构上下标错误

Question

我有一个像这样的深度嵌套的字典数组:

func markAllBooksAsUnread() {

    for (cat, catArray) in bookage.setless {
        for (gen, genArray) in catArray {
            for (foc, focArray) in genArray {
                for dict in focArray {
                    bookage.setless[cat]![gen]![foc]![dict]["read"] = "no"
                }
            }
        }
    }
}

这段代码在我看来是正确的，但产生了错误:

Cannot subscript a value of type Array<Dictionary<String, String>> with an index of type 'Dictionary<String, String>'

在 [dict] 中的 'd' 下加上胡萝卜。 bookage.setless 数组的结构是:

var setless = [String : Dictionary<String, Dictionary<String, Array<Dictionary<String, String>>>>]()

我做错了什么？

Answer 1

dict 是一个字典，你不能用它作为索引。试试这个:

for (cat, catArray) in bookage.setless {
    for (gen, genArray) in catArray {
        for (foc, focArray) in genArray {
            for i in focArray.indices {
                bookage.setless[cat]![gen]![foc]![i]["read"] = "no"
            }
        }
    }
}