NSKeyedArchiver and NSKeyedUnarchiver with NSMutableArray

Question

I\'m hoping this isn\'t something to do with the fact that I\'m using a Mutable array here, but this one is baffling me so it wouldn\'t surprise me if that were the case.

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Answer 1

I was having the same issue when unarchiving a custom object

self.calTable = [[NSKeyedUnarchiver unarchiveObjectWithFile:calibrationFile] objectForKey:@"calTable"];

Based on Rob's answer I changed to

self.calTable = [[[NSKeyedUnarchiver unarchiveObjectWithFile:calibrationFile] mutableCopy] objectForKey:@"calTable"];

and it fixed all errors.