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My NSArrayController is readonly
@property (readonly) NSArrayController *rootObjectsArrayController;
but its content is changed anyway
[[aClass rootObjectsArrayController] setContent:contentArray];
and it works. Why ?
Read only for a property definition just means that you can’t set that property – e.g you can’t set a new array controller as the rootObjectsArrayController via generated accessor methods.
There is nothing stopping you modifying the object that is returned from the getter, though. This would be the same if you had a mutable array as a read only property- you could add objects to the array after accessing it via the property.