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iOS intermediate--about deep copy and shallow copy

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deep Copy (deep copy, content copy, deep?copy)? The source object and the replica object are different two objects? The source object reference counter is unchanged, the Copy object counter is 1 (because it is newly generated)The essence is: A new object has been created?shallow copy (shallow copy, pointer copy, shallow?copy)? The source object and the replica object are the same object? source object (Replica object) reference counter? +?1, which is equivalent to doing a retain operation? The essence is: No new objects are produced

iOS intermediate--about deep copy and shallow copy

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