Do I have to retain a SEL

When I get a selector passed to my method, should I just save it:

-(void) setCallBack:(SEL) sel开发者_Python百科ectorToCall
{
    self->mSelectorToCall = selectorToCall;
}

or should I retain?

-(void) setCallBack:(SEL) selectorToCall
{
    self->mSelectorToCall = [selectorToCall retain];
}

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No, the SEL type isn't an object reference, it's basically a constant string pointer. You can just assign it as in your first example.

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No, selectors are not objects, so you can't retain them.