objective c - Adding a NSDictionary to a NSArray duplicates the first NSDictionary every time -

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so pulled json data web service stored in nsarray called _infofromjson. each array element in _infofromjson has dictionary of key/value pairs. goal add them myvehicleobject nsmutablearray

for (nsdictionary* mydictionary in _infofromjson) {     myvehicleobject *vehicleinmembersprofile;     vehicleinmembersprofile = [[myvehicleobject alloc] init];     vehicleinmembersprofile.make = [[_infofromjson objectatindex:carcount] objectforkey:@"make"];     vehicleinmembersprofile.carname = [[_infofromjson objectatindex:carcount] objectforkey:@"nickname"];     vehicleinmembersprofile.year = [[_infofromjson objectatindex:carcount] objectforkey:@"year"];     carcount ++;     [self.myvehicleobject addobject:vehicleinmembersprofile] ; };

with above code sort of achieved it, keeps adding same 1st dictionary myvehicleobject, inserts same nsdictionary 4 times in past have used this:

[self.myvehicleobject addobject:[vehicleinmembersprofile copy]] ;

when it throws following exception:

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[myvehicleobject copywithzone:]: unrecognized selector sent instance 0xab4e130'

what doing wrong here? thanks!

update requested sample json:

{         color = silver;         engine = "";         id = "cf270b81-3821-4585-8c90-7089d7a8654e";         imageurl = "https://www.someprotectedurl.com/somefile.png";         licenseplate = "abc-123";         make = honda;         model = "cr-v";         nickname = "my cr-v";         vin = "xx551234687687687654";         year = 2009;     }

this may or may not related problem, forin loop broken. whether or not incorrect usage actual cause of problem, should fix can nothing cause problems.

if want use indexofobject: grab object @ index of array you're iterating through, should use regular for loop:

for (int carcount=0; index < [_infofromjson count]; ++carcount) {     // loop body remains identical have...      // except remove carcount++; }

but you're doing, forin loop indeed better, , forin loops can faster since can handled in batches. if you're using forin loop, use object you're defining in loop declaration:

for(nsdictionary* mydictionary in _infofromjson) {     // mydictionary reference object in _infofromjson,      //for whatever given index working on      myvehicleobject *vehicleinmembersprofile = [[myvehicleobject alloc] init];     vehicleinmembersprofile.make = mydictionary[@"make"];     vehicleinmembersprofile.carname = mydictionary[@"nickname"];     vehicleinmembersprofile.year = mydictionary[@"year"];     [self.myvehicleobject addobject:vehicleinmembersprofile]; }

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