Differences between object copy and retain

@ Interface person:Nsobject

// Retian: ReleaseOld value, retainNew Value

@ Property(Nonatomic, Retain)Book* Book;

// Copy: ReleaseOld value, copyNew Value

@ Property(Nonatomic, Retain)Nsstring* Name;

/*

In non-In the case of Arc:

1. Copy releaseOld value, copyNew Value

2. AssignDirect reset value

3 retaion releaseOld value, retainNew Value

 

 In the ArcWhen:

1. Copy

2. AssignBasic Data Type

3. StrongSimilar to retain ---Used on objects

4. WeakSimilar to assign ---Used on objects (Used on objects)

*/