Question

I’m having a problem with using delegate inside Blocks.

With ARC on, this is example to show the issue.

- (void)whatsGoingOn {

    NSString *address = @"someAddress";    

    //setting for request
    NSURL *requestURL               = [NSURL URLWithString:address];    
    __weak ASIHTTPRequest *request  = [ASIHTTPRequest requestWithURL:requestURL];    

    [delegate_ postDelegateMethod]; //This delegation works fine       

    [request setCompletionBlock:^{     
        [delegate_ postDelegateMethod]; //This delegation doesn't work        
    }];

    [request startAsynchronous];
}

It seems that I can’t post delegation inside Blocks.
What should I do in this situation?

I can use notification instead, but I don’t feel that’s a good way to go.

This is the head part of the class.
If I don’t use weak, the request part will make a retain cycle, so not sure what to do yet.

@interface URLFilter : NSObject {
      id __weak                   delegate_;
}
@property (nonatomic, weak) id                              delegate;


@implementation URLFilter
@synthesize delegate    = delegate_;

*SOLVED!!!

It worked by making another __block id blockDelegate.
And, there is no memory leak either.

- (void)whatsGoingOn {

    NSString *address = @"someAddress";    

    //setting for request
    NSURL *requestURL               = [NSURL URLWithString:bitlyAPIAddress];    
    __weak ASIHTTPRequest *request  = [ASIHTTPRequest requestWithURL:requestURL];    

    //set blockDelegate since delegate_ will be gone inside blocks
    __block id blockDelegate        = delegate_;

    [request setCompletionBlock:^{        

        //it works
        [blockDelegate postDelegateMethod];
    }];

    [request startAsynchronous];
}

UPDATE

I looked at the code again, and the issue might be caused by this block method outside of
that whatsGoingOn method.

Inside of this twitter api block method, I call that whatsGoingOn method, and inside of whatsGoingOn method, I put asihttprequest block method.

Strangely, if I use usual delegate method of asihtttprequest in side of blocks, it crushes,
that’s why I picked up block method of asihttprequest.

//request tweet data
[twRequest performRequestWithHandler:^(NSData *responseData,
                                         NSHTTPURLResponse *urlResponse,
                                         NSError *error) {
    [self whatsGoingOn];                            
}];

Answer 1

It worked by making another __block id blockDelegate.
And, there is no memory leak either. 🙂

//setting for request
NSURL *requestURL               = [NSURL URLWithString:bitlyAPIAddress];    
__weak ASIHTTPRequest *request  = [ASIHTTPRequest requestWithURL:requestURL];    

//set blockDelegate since delegate_ will be gone inside blocks
__block id blockDelegate        = delegate_;

[request setCompletionBlock:^{        

    //it works
    [blockDelegate postDelegateMethod];
}];

[request startAsynchronous];