Method: UIView#uiimage

Defined in:
lib/sugarcube-uikit/uiview.rb

#uiimage(use_content_size = false) ⇒ Object

Easily take a snapshot of a UIView.

Calling uiimage with no arguments will return the image based on the bounds of the image. In the case of container views (notably UIScrollView and its children) this does not include the entire contents, which is something you probably want.

If you pass a truthy value to this method, it will use the contentSize of the view instead of the bounds, and it will draw all the child views, not just those that are visible in the viewport.

It is guaranteed that true and :all will always have this behavior. In the future, if this argument becomes something that accepts multiple values, those two are sacred.



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# File 'lib/sugarcube-uikit/uiview.rb', line 78

def uiimage(use_content_size=false)
  scale = UIScreen.mainScreen.scale
  if use_content_size
    UIGraphicsBeginImageContextWithOptions(contentSize, false, scale)
    context = UIGraphicsGetCurrentContext()
    subviews.each do |subview|
      CGContextSaveGState(context)
      CGContextTranslateCTM(context, subview.frame.origin.x, subview.frame.origin.y)
      subview.layer.renderInContext(context)
      CGContextRestoreGState(context)
    end
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
  else
    UIGraphicsBeginImageContextWithOptions(bounds.size, false, scale)
    layer.renderInContext(UIGraphicsGetCurrentContext())
    image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
  end
  return image
end