What is the “Mode” property in Interface Builder which offers “Scale to fill”, “Aspect fit” etc.?

Question

I\'m wondering what the dropdown \"Mode\" is about? It contains \"Scale to fill\", \"Aspect fit\" and so on. I never had to change it so far, still I\'m curious what it can

Answer 1

http://vocaro.com/trevor/blog/2009/10/12/resize-a-uiimage-the-right-way/

should give you the basic ideas very well.