Framework vs. BlocksKit handling, for blog

actionSheetStandard.m

- (IBAction)clickedCloseButton:(id)sender {
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Discard post?"
        delegate:self
        cancelButtonTitle:@"Cancel"
        destructiveButtonTitle:@"Discard"
        otherButtonTitles:@"Save draft", nil];
    [actionSheet showInView:self.view];
}

// UIActionSheetDelegate methods
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 0) {
        // save as draft
    } else if (buttonIndex == 1) {
        // discard
    }
}

actionSheetWithBlocksKit.m

- (IBAction)clickedCloseButton:(id)sender {
    UIActionSheet *confirmSheet = [UIActionSheet actionSheetWithTitle:@"Discard post?"];
    [confirmSheet addButtonWithTitle:@"Save draft" handler:^{
        // save as draft
    }];
    [confirmSheet setDestructiveButtonWithTitle:@"Discard" handler:^{
        // discard
    }];
    [confirmSheet setCancelButtonWithTitle:@"Cancel" handler:NULL];
    [confirmSheet showInView:self.view];
}

doneButtonStandard.m

- (void)done:(id)sender {
    [self dismissViewControllerAnimated:YES completion:NULL];
}

- (void)viewDidLoad {
    // ... normal viewDidLoad setup
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
        target:self
        action:@selector(done:)];
}

doneButtonWithBlocksKit.m

- (void)viewDidLoad {
    // ... normal viewDidLoad setup
    UIViewController *__weak blockSelf = self;
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
        handler:^(id sender) {
            // Calling dismissViewControllerAnimated:completion: on nil
            // is actually fine. However, if a nil blockSelf is *not*
            // all right, do something like the following to nil-check
            // (threadsafe-edly!) the previously-unretained copy of self:
            //
            // UIViewController *strongBlockSelf = blockSelf;
            // if (strongBlockSelf) { // then do things }
            [blockSelf dismissViewControllerAnimated:YES completion:NULL]; // safely avoids 
        }];
}