detect direction drag in UIVIEW

i understand need inherit uiview , detect drags in there, there straight forward calculation can drag 8 direction drag ? right buttom left top , 4 corners ?

regards

 

have read documentation on multi-touch events ?

http://developer.apple.com/library/...s.html#//apple_ref/doc/uid/tp40009541-ch3-sw1

there examples there simple "touch , move" drag imagine.

 

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