ios - Adding NSString to NSMutableString -


i want add multiple nsstrings yo nsmutablestring construct list of strings.

this code in method takes nsdictionary , grabs value out of - stores in nsstring, there append string nsmutablestring. when running method first time works. however, when call method again, replaces last string in nsmutablestring.

here code: 

nsstring *userid = [nsstring stringwithformat:@"%@,", parameters[@"userid"]]; self.alluserids = [nsmutablestring string];   [self.alluserids appendstring:userid];

can tell me doing wrong?

self.alluserids declared strong.

this:

self.alluserids = [nsmutablestring string];

is creating new mutable string. should done once, before want use mutable string, , not done again until want restart (because recreating mutable string destroys old instance had).


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