Recursive Block Retain Cycles

Question

Will this lead to any sort of retain cycle? Is it safe to use?

__block void (^myBlock)(int) = [^void (int i)
{
    if (i == 0)
        return;

    NSLog(@\"         


        

Answer 1

If you are using ARC, you have a retain cycle, because __block object variables are retained by the block. So the block retains itself. You can avoid it by declaring myBlock as both __block and __weak.

If you are using MRC, __block object variables are not retained, and you should have no problem. Just remember to release myBlock at the end.