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So I have a property NSMutableArray *grades. At the only place where I set this property, I am doing this:
NSMutableArray *array = [[NSMutableArray alloc] init];
self.grades = array;
[array release];
[self.grades addObject:@"20"];
The last statement generates an exception: -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object'.
What in the world am I missing?
It sounds like the property is set to
copy, which means the synthesized accessor makes an immutable copy of the array