Uiscrollview zoom code

i've found code on ray wenderlich

uiscrollview *scrollview;

code:

cgrect scrollviewframe = self.scrollview.frame;  cgfloat scalewidth = scrollviewframe.size.width / self.scrollview.contentsize.width;  cgfloat scaleheight = scrollviewframe.size.height / self.scrollview.contentsize.height;

why isn't scrollviewframe.size.width written self.scrollview.scrollviewframe.size.width?

source:

code:

http://www.raywenderlich.com/10518/how-to-use-uiscrollview-to-scroll-and-zoom-content

 

not looking @ site, know ray wenderlich, think self.
when self. used? property? or ivar?

 

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