Question

I’m trying to save data to and XML file on Iphone. For that, I load the wholeXML, add new data and the save it again. The problem arises when i try to store the new data, my

 [mArray addObject:newData];

methods crashes, as mArray is not a NSMutableArray, instead, it is a NSCFArray even if I applied a mutableCopy method to it.
As I understand, a NSCFArray is a toll-free bridging to an NSArray, so I can’t understand why the mutablyCopy method is not working.
Any idea??

NSMutableDictionary *wholeXML = [[NSMutableDictionary alloc] init];
wholeXML = xmlData;

NSArray *array = [[NSArray alloc] init];
NSMutableArray *mArray = [[NSMutableArray alloc] init];
array = [wholeXML objectForKey:@"Key"];
mArray = [a mutableCopy];

Answer 1

NSCFArray is a private subclass that gets instantiated when you do things with NSArray factory methods or initializers. You’re doing too many initializations. Try this simplified version:

NSMutableDictionary *wholeXML = [[NSMutableDictionary alloc] initWithDictionary:xmlData];
NSMutableArray *mArray = [[NSMutableArray alloc] initWithArray:[wholeXML valueForKey:@"Key"]];