objective c - Detect rootcontroller in iphone sdk -

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i have using 2 types of controller in application i.e. navigationcontroller , presentviewcontroller. how can detect base controller @ instance through code i.e using navigation or presentviewcontroller transist 1 viewcontroller viewcontroller?

try take rootviewcontroller of navigation:

uiviewcontroller *topviewcontroller = [self.navigationcontroller topviewcontroller];

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