我也遇到这个问题,请问你解决了吗?

是 iPhone7或iPhone7plus 中的UIView *fromTempView = [fromVC.view snapshotViewAfterScreenUpdates:NO];失效
改成

• (UIView *)imageFromView:(UIView *)snapView {
  UIGraphicsBeginImageContext(snapView.frame.size);
  CGContextRef context = UIGraphicsGetCurrentContext();
  [snapView.layer renderInContext:context];
  UIImage *targetImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  UIImageView *tmpView = [[UIImageView alloc] initWithImage:targetImage];
  snapView.frame = snapView.frame;
  return tmpView;
  }

谢谢，的确是坑爹的iPhone7和7p的ScreenUpdates相关API失效导致截屏失败而出现白屏了，现已修复！