iOS开发，我使用下面代码截取屏幕的时候，可以截取到系统键盘，但是第三方键盘无法截取到？大神帮忙看看

iOS开发，我使用下面代码截取屏幕的时候，可以截取到系统键盘，但是第三方键盘无法截取到？大神帮忙看看？？？

• (UIImage *)screenshotImage
  {
  CGSize imageSize = CGSizeZero;
  UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
  if (UIInterfaceOrientationIsPortrait(orientation))
  imageSize = [UIScreen mainScreen].bounds.size;
  else
  imageSize = CGSizeMake([UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);

  UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
  CGContextRef context = UIGraphicsGetCurrentContext();
  AppDelegate *app = (AppDelegate *)[UIApplication sharedApplication].delegate;
  for (UIWindow *window in [[UIApplication sharedApplication] windows])
  {
  CGContextSaveGState(context);
  CGContextTranslateCTM(context, window.center.x, window.center.y);
  CGContextConcatCTM(context, window.transform);
  CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
  if (orientation == UIInterfaceOrientationLandscapeLeft)
  {
  CGContextRotateCTM(context, M_PI_2);
  CGContextTranslateCTM(context, 0, -imageSize.width);
  }
  else if (orientation == UIInterfaceOrientationLandscapeRight)
  {
  CGContextRotateCTM(context, -M_PI_2);
  CGContextTranslateCTM(context, -imageSize.height, 0);
  } else if (orientation == UIInterfaceOrientationPortraitUpsideDown) {
  CGContextRotateCTM(context, M_PI);
  CGContextTranslateCTM(context, -imageSize.width, -imageSize.height);
  }
  [window.layer renderInContext:context];
  CGContextRestoreGState(context);
  }
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  return image;
  }

sogo键盘截图

系统键盘截图