按键按字母顺序排序NSMutableDictionary

Question

如果我有NSMutableDictionary keys {B,A,D,C}和values {custom obj1, custom obj2, custom obj3, custom obj4}，

我希望这可以归类为

{A,B,C,D} -> {custom obj2, custom obj1, custom obj4, custom obj3}

Answer 1

您无法自行排序词典。但是，您可以获取密钥数组[dictionary allKeys]并对其进行排序。类似的东西：

NSMutableArray mutableKeys = [[dictionary allKeys] mutableCopy];
[mutableKeys desiredSortingMethod];