Getting error when trying to modify a property of a nscopied object...

Warning : "Sending 'NSObject *' to parameter of incompatible type 'id<NSCopying&...

Objective-c: custom class instance as dictionary key returns nil when key exists...

iPhone : (id)copyWithZone:(NSZone *)zone : what is "zone" for?...

Why zone is always nil while implementing NSCopying?...

Override copyWithZone: in Objective-C...

How to copy all objects of NSArray when copying the array itself...

Is returning [self retain] in copyWithZone for immutable classes with mutable subclasses really safe...

NSString property and custom init...

Can I use NSPredicate as key in a NSDictionary...

mutableCopyWithZone confusing requirement?...

Using NSCopy to Copy a Custom Object Containing Pointers?...

Using -mutableCopyWithZone: on custom class makes it immutable...

NSCoding VS NSCopying...

NSCopying and Objective-C memory management...

Incompatible pointer types sending 'Class' to parameter of type 'id<NSCopying>&#39...

In ios will NSString = NSString cause memory leaks?...

Problems with getting and changing NSMutableArray objects...

Why doesn't UIView (or it's subclasses) adopt the NSCopying Protocol?...

UILocalNotification - mutable copying...

copyWithZone issue...

How to subclass UIButton to allow to copy and encode for archiving?...

Can't copy NSMutableArray to property...

What is the meaning of "zone" in copyWithZone:?...

Save CoreData result array even after it is deleted from the CoreData...

NSCopying, copyWithZone and NSDictionary...

Questions about duplicating last object of a NSArray...

NSCopying and copyWithZone: - should they return [self retain] or something else?...

Should I check for nil in copyWithZone:?...

Enabling the NSCopying protocol in a class...