ios - Under ARC, property and declare of Objective-C confused -


Under ARC, if I define an Ivice like this: 

  @ Interface ObjectA: NSObject {ID A; } @protecti (noncommercial, unsafe_reentended) id a;   
 What is the property of A? Strong or unsafe - request?   
 
 
 It depends on how you implement it  
     < Li> using  @ synthesis A;  or  @ synthesis A = __a; In this case, you can do this:  __ is unsafe_property / , because the details of ownership of the property constitute the details of ownership of ivar  1 .  
  •  Manually  a  and  set . In this situation, the results will depend on the backing variables you choose for implementation.  2    
     Here is a document which rules the ownership of rules, which is determined by Section 4.1.1.  
     
      1  If the associated frequency variable already exists, its ownership merit should be equal to the ownership of the property; Otherwise, the example variable [property] has been created with that merit capability.  
      2  The specified ownership of a property is preserved in its metadata, but otherwise it is completely conventional, the property is synthesized.

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