iphone - 如何将 NSDictionary 转换为 NSMutableDictionary？

Question

我有一个现有的 NSDictionary:

{
    "charts_count" = 2;
    "created_at" = "2010-04-12T16:37:32Z";
    exchange = NASDAQ;
    "followers_count" = 259;
    id = 8404;
    industry = "<null>";
    "messages_count" = 1436;
    ric = "GRPN.O";
    sector = "<null>";
    symbol = GRPN;
    title = Groupon;
    "updated_at" = "2011-09-05T04:17:56Z";
}

如何获取这些内容并将其放入新的 NSMutableDictionary？

Answer 1

使用-mutableCopy。

NSDictionary *d;
NSMutableDictionary *m = [d mutableCopy];

请注意，-mutableCopy 返回 id(在 Swift 中为 Any)，因此您需要分配/强制转换为正确的类型。它会创建原始字典的浅拷贝。