A recursive block in Objective-C

gistfile1.txt

- (void)runRecursiveBlock
{
    void(^ completionBlock) ();
    void(^ __block __weak weakCompletionBlock) ();
    weakCompletionBlock = completionBlock = ^{
        NSLog(@"%@", NSStringFromSelector(_cmd));
        void(^ strongCompletionBlock)() = weakCompletionBlock;
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            strongCompletionBlock();
        });
    };
    
    completionBlock();
}