ios - Don't Understand the concept of the pushViewController -

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can explain me concept of pushing , popping stack items in uinavigationcontroller.i know meaning of push , pop used in stack opreation in data structure don't know how work in uinavigationcontroller.please explain the following functions of it. 

pushviewcontroller:animated:  - popviewcontrolleranimated:  - poptorootviewcontrolleranimated:  - poptoviewcontroller:animated:  interactivepopgesturerecognizer

thanks.

its same concept stack in data structure really, except can view whats on top (ie top viewcontroller in navigation stack)

so pushing viewcontroller means going on top of stack (animates coming in right) popping viewcontroller take viewcontroller off top (which current 1 looking at) animate off right of screen, showing viewcontroller underneath top one

poptorootviewcontroller popping until hit last viewcontroller in navigation stack

poptoviewcontroller pops until particular viewcontroller on top

hope thats clarification need


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