title: I can save the image view and the sticker together
body: <p>I added a sticker to image view.</p>
  
  <p>So I saved it with the following source.</p>
  
  <pre><code> imageView.addSubview(StickerView[0])
  
      // Create the image context to draw in
      UIGraphicsBeginImageContextWithOptions((imageView.bounds.size), false, 0)
  
      // Get that context
      let context = UIGraphicsGetCurrentContext()
  
      // Draw the image view in the context
      imageView.layer.render(in: context!)
  
      // You may or may not need to repeat the above with the imageView's subviews
      // Then you grab the "screenshot" of the context
      let image = UIGraphicsGetImageFromCurrentImageContext()
  
      // Be sure to end the context
      UIGraphicsEndImageContext()
  
      CustomPhotoAlbum.sharedInstance.save(image: image! )
  </code></pre>
  
  <p>Well saved. However, the black background on both sides of the image is saved as well. Can I save only part of the image except the black background?</p>
  
  <p>This is saved together. I want to save only the part of the image except this one.</p>