...
PBViewController *pbViewController = [PBViewController new];
// Use your own subclass of UIImageView to display.
pbViewController.imageViewClass = PBImageView.class;
pbViewController.pb_dataSource = self;
pbViewController.pb_delegate = self;
pbViewController.pb_startPage = sender.tag;
[self presentViewController:pbViewController animated:YES completion:nil];
...

...
#pragma mark - PBViewControllerDataSource

- (NSInteger)numberOfPagesInViewController:(PBViewController *)viewController {
    return self.frames.count;
}

- (void)viewController:(PBViewController *)viewController presentImageView:(UIImageView *)imageView forPageAtIndex:(NSInteger)index progressHandler:(void (^)(NSInteger, NSInteger))progressHandler {
    NSString *url = [NSString stringWithFormat:@"https://raw.githubusercontent.com/cuzv/PhotoBrowser/dev/Example/Assets/%@.jpg", @(index + 1)];
    UIImage *placeholder = self.imageViews[index].image;
    [imageView sd_setImageWithURL:[NSURL URLWithString:url]
                 placeholderImage:placeholder
                          options:0
                         progress:progressHandler
                        completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
                        }];
}

- (UIView *)thumbViewForPageAtIndex:(NSInteger)index {
    if (self.thumb) {
        return self.imageViews[index];
    }
    return nil;
}

#pragma mark - PBViewControllerDelegate

- (void)viewController:(PBViewController *)viewController didSingleTapedPageAtIndex:(NSInteger)index presentedImage:(UIImage *)presentedImage {
    [self dismissViewControllerAnimated:YES completion:nil];
}