objective c - retaining an object that was added to a relationship property of an NSManagedObject -


in have nsmanagedobject subclass:

    @interface managedactivityamount : nsmanagedobject      @property (nonatomic, retain) nsnumber * distance;     @property (nonatomic, retain) nsnumber * duration;     @property (nonatomic, retain) nsset *sets;      @end      @interface managedactivityamount (coredatageneratedaccessors)      - (void)addsetsobject:(managedpowerset *)value;     - (void)removesetsobject:(managedpowerset *)value;     - (void)addsets:(nsset *)values;     - (void)removesets:(nsset *)values;      @end

i encounter problem in keeping reference object added sets relationship using the:

    - (void)addsetsobject:(managedpowerset *)value;

the managedpowerset object added managedactivityamount sets property, , i'm assuming it's retain count 1 due (the actual object autoreleased before retain count 0 before adding set). correct? missing something?

i'm assigning managedpowerobject instance variable of view controller (this private instance variable, not retained property) can't seem access later. should retain it? i'm , check, want understand wasn't retained in first place.

thanks :)

if not using arc, must claim ownership (retain) of intend use @ later time. , release when done (for ivars in class's dealloc implementation). suggest use properties results in less coding. due fact must release old pointers before assigning new ones:

[_managedpowerobject release]; _managedpowerobject = [managedpo retain];

this used whenever assigning ivar (instance variable) directly. or use property:

@property (nonatomic, retain) managedpowerobject *managedpowerobject;

the default implementation of property handle release/retain , can use:

self.managedpowerobject = managedpo;

i suggest reading through apple's memory management guidelines: https://developer.apple.com/library/mac/#documentation/cocoa/conceptual/memorymgmt/articles/memorymgmt.html#//apple_ref/doc/uid/10000011-sw1


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