How can I convert an NSDictionary to an NSMutableDictionary?
I have an existing NSDictionary that has:
{
"charts_count" = 2;
"creat开发者_Python百科ed_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";
}
How can I take these contents and put it into a new NSMutableDictionary?
Use -mutableCopy
.
NSDictionary *d;
NSMutableDictionary *m = [d mutableCopy];
Note that -mutableCopy
returns id
(Any
in Swift) so you will want to assign / cast to the right type. It creates a shallow copy of the original dictionary.
In case of Swift
var tempDic: NSMutableDictionary = yourDictionary.mutableCopy() as NSMutableDictionary
Try this in swift 3
let mutableDic: NSMutableDictionary = (yourDictionary as! NSDictionary).mutableCopy() as! NSMutableDictionary
NSMutableDictionary *newInfo = [[NSMutableDictionary alloc] init];
[newInfo setDictionary:info];
Also works, since you are setting the dictionary not appending. You can also use:
[newInfo addEntriesFromDictionary:info];
for the same effect and to append to existing content.
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