objective c - iPhone - difference between topViewController and other forms -


i on delegate of navigationcontrol based app.

when try access rootviewcontroller using

rootviewcontroller *rootviewcontroller = (rootviewcontroller *)[navigationcontroller topviewcontroller];

to run method, crashes, saying method "unknown" on rootviewcontroller.

when access rootviewcontroller using this

rootviewcontroller *rootviewcontroller = (rootviewcontroller *)[navigationcontroller.viewcontrollers objectatindex:0];

it works.

which object first line accessing?

thanks

topviewcontroller of navigation controller represents view controller @ top of stack. index 0 bottom. topviewcontroller object @ index 0 when 1 view controller on stack. if have more one, not same. guessing case it's crashing because topviewcontroller doesn't know how respond messages intended rootviewcontroller instance.


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