set photoview's contentSize to zoomed image size

[elephantman]

hi

when 2 times tapped to an image in photoimageviewcontroller the scrollview's contentsize's height is set to 1200. this is calculated by bound.height * maxzoomlevel (in my example it is 2.5) so 480*2.5=1200

but there are many black spaces in the view i dont want to see black background i just want to see image's zoomed view

where is that calculation ? (bound.height * maxzoomlevel ) i can not find.

forexample my image's width=1200 and height=900 so when i tap 2 time and zoom to that image the scrollview's content size and bounds 1200x900 and i want to see the actual size of my image

could you help me where can i change these calculations?