Part 14 - UIView's Stretching Property

• It was used to handle corners of images, to prevent them from stretching while stretching out the other parts that would not look weird.
  
  
  
• This property is actually deprecated and should not be used. Instead, you should use Image Slicing.
  Example of Image Slicing:
  

Reference: http://macoscope.com/blog/stretchable-images-using-interface-builder/

(Xcode 8, Swift 3)