Multiple blocks in each other, using strong self and weak self to avoid retain cycles

Question

I did get used to write

__weak typeof( self ) wself = self
[smth doSomeBlock:^(void) {
   __strong typeof( wself ) sself = wself;
   [sself callAny];
}]

So i avoid retain cycles

But what to do when multiple blocks are nested?

__weak typeof( self ) wself = self
[smth doSomeBlock:^(void) {
   __strong typeof( wself ) sself = wself;
   [sself doSomeBlock:^(void) {
       // wself, or sself? my mind is blown
       // what if another block?
   }];
}]

Answer 1

Your first example looks like you're wasting your effort. There's no problematic retain cycle unless: self owns smth AND smth owns the Block AND you're not going to destroy the Block until self is destroyed. If any of those is not true, there's no reason to do the weak/strong dance.

The second situation is the same: the nesting doesn't change anything. Is there a chain of ownership from self to the Block or not? If no, then it doesn't matter which class of pointer you use.