dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    // This runs in a background thread

    // dictionary of tags
    NSDictionary *tagDict = @{@"tag1": @3,
                   @"tag2": @5,
                   @"tag3": @7,
                   @"tag4": @2};


    HPLTagCloudGenerator *tagGenerator = [[HPLTagCloudGenerator alloc] init];
    tagGenerator.size = CGSizeMake(self.tagView.frame.size.width, self.tagView.frame.size.height);
    tagGenerator.tagDict = tagDict;

    NSArray *views = [tagGenerator generateTagViews];

    dispatch_async( dispatch_get_main_queue(), ^{
        // This runs in the UI Thread

        for(UIView *v in views) {
            // Add tags to the view we created it for
            [self.tagView addSubview:v];
        }

    });
});