How do I add distance considerations to the WWDC 2010 Teapot sample code in iOS?

How do I add distance considerations to the WWDC 2010 Teapot sample code
in iOS?

References

Reference NO 1

http://stackoverflow.com/questions/15198723/how-do-i-add-distance-considerations-to-the-wwdc-2010-teapot-sample-code-in-ios

Reference NO 2

http://stackoverflow.com/questions/17848361/wwdc-2013-sample-code

Reference NO 3

http://stackoverflow.com/questions/6535994/wwdc-2011-sample-code

Reference NO 4

http://stackoverflow.com/tags/wwdc/hot

Reference NO 5

http://stackoverflow.com/questions/10923119/photoscroller-sample-code-in-wwdc-2010-when-its-rotated-the-bounds-width-is-no

Reference NO 6

#EANF#

Reference NO 7

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Reference NO 8

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