Recursive Block Call

recursive_block.m

-(void) printString: (NSString*) msg
         onComplete: (void (^)(void)) complete{
    NSLog(@"%@", msg);
    complete();
}

-(void) demoRecursiveBlock
{
    __block int index = 0;
    NSArray* array = @[@"ABC", @"DEF", @"MNP"];
    
    __block __weak void (^weak_Complete)(void);
    
    __block __strong void (^strong_Complete)(void) ;
    
    weak_Complete = strong_Complete = ^{
        index++;
        NSLog(@"%d", index);
        if (index == array.count) return;
        NSString* str = array[index];
        
        [self printString:str onComplete:weak_Complete];
    };
    
    NSString* str = array[index];
    [self printString:str onComplete: strong_Complete];
}