Specifically, this problem has come to me when I make a request with AFNeworking with JSONkit and receive a (id)JSON with several arrays and dictionaries nested.
If I don't want to modify the data, I don't have any problem:
self.myNSArray = [JSON objectForKey:@"result"];
But if I want to modify the data I must to store it in a mutable variable:
self.myNSMutableArray = [[JSON objectForKey:@"result"] mutableCopy];
The last one doesn't convert nested arrays or dictionaries to mutable data; it works only for first level.
The only way that I have found is on this link recursive mutable objects; but I don't know if there is a best way to resolve this kind of problem.
Thanks in advance.
You could use the CoreFoundation function CFPropertyListCreateDeepCopy
with the mutability option kCFPropertyListMutableContainersAndLeaves
:
NSArray *immutableArray = [JSON objectForKey:@"result"];
self.myMutableArray = [(NSMutableArray *)CFPropertyListCreateDeepCopy(NULL, immutableArray, kCFPropertyListMutableContainersAndLeaves) autorelease];