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Using Xcode 4.2 and ARC, I notice that the auto-generated code for an NSManagedObject still reads like this for properties:
@property (nonatomic, retain) NSString * someString; 1) Shouldn't retain now be replace with strong or weak?
2) Why does the auto-generated code still use retain
3) What is the correct replacement for retain in this property statement?
I'm currently debugging a problem using NSFetchRequest, and I thought this might be the source of the problem. Thoughts?
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strong (default) Strong just means you have a reference to an object and you will keep that object alive. As long as you hold that reference to the object in that property, that object will not be deallocated and released back into memory.
Assign creates a reference from one object to another without increasing the source's retain count. Retain creates a reference from one object to another and increases the retain count of the source object.
strong / retain : Declaring strong means that you want to “own” the object you are referencing. Any data that you assign to this property will not be destroyed as long as you or any other object points to it with a strong reference.
Nonatomic means multiple thread access the variable (dynamic type). Nonatomic is thread unsafe. But it is fast in performance.
1) Shouldn't retain now be replace with strong or weak?
No. You cannot replace retain with weak; they are different. And strong is a 100% synonym for retain; they are identical. You can use either, so there is no "should" here. You can replace retain with strong if you like, but you don't have to.
2) Why does the auto-generated code still use retain
Why not? See (1). retain is correct so there is no problem.
3) What is the correct replacement for retain in this property statement?
There is no need to replace retain.
I'm currently debugging a problem using NSFetchRequest, and I thought this might be the source of the problem. Thoughts?
It isn't.
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