NSInteger index = xxx;
  WYPhotoBrowserViewController *vc = [[WYPhotoBrowserViewController alloc] initWithPhotos:self.photos];
  vc.dataSource = self;
  vc.currentIndex = index;
  [self presentViewController:vc animated:YES completion:nil];

#pragma mark - WYPhotoBrowserViewControllerDataSource

- (CGRect)photoBrowserViewController:(WYPhotoBrowserViewController *)browserViewController sourceViewFrameAtScreenForIndex:(NSInteger)index {
  NSInteger tag = index + yyyyy;
  UIView *imgView = [self.view viewWithTag:xxxxx];
  return [self.view convertRect:imgView toView:[UIApplication sharedApplication].keyWindow];
}