objective c - When should I add self before an object? is it save to always add it for view level objects? -

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yesterday found needed add self object causing problem.

i've been adding self few other objects today, compiles , seems work fine when do. i'm wondering if maybe shouldn't adding self ?

if have ivar backing property myfoo, self.myfoor use property, whereas myfoo directly not.
example property:

@property(nonatomic, retain) myclass myfoo;

self.myfoo = temp; retain temp
myfoo = temp; not retain temp


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