我怎么能转换一个NSDictionary到一个NSMutableDictionary？

Question

我有一个现有的NSDictionary有：

{
    "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";
}

我怎样才能把这些内容并把它变成一个新的NSMutableDictionary？

Answer 1

使用-mutableCopy。

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

需要注意的是-mutableCopy返回id（斯威夫特Any），所以你会想分配/强制转换为正确的类型。它创建原始字典的浅拷贝。

Answer 2

在斯威夫特的情况下，

var tempDic: NSMutableDictionary = yourDictionary.mutableCopy() as NSMutableDictionary

Answer 3

在迅速3试试这个

let mutableDic: NSMutableDictionary =  (yourDictionary as! NSDictionary).mutableCopy() as! NSMutableDictionary