objective c - ViewController Delegate -

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is possible access viewcontroller's methods appdelegate, possible inverse following code:?

appdelegate *ad = (appdelegate *) [[uiapplication sharedapplication] delegate];

when try

viewcontroller *vc = (viewcontroller *) [[uiapplication sharedapplication] delegate];

i error...

thanks!

viewcontroller *vc = (viewcontroller *)[uiapplication sharedapplication].keywindow.rootviewcontroller;

or if delegate have properties

yourappdelegate *ad = (yourappdelegate*)[uiapplication sharedapplication].delegate; viewcontroller *vc = ad.yourviewcontrollerproperty;

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