hoge.m
NSArray *array = self.navigationController.viewControllers;
int arrayCount = [array count];
HogeViewController *parent = [array objectAtIndex:arrayCount - 2];
objectiAtIndexは -2 にすると呼び出し元になる
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NSArray *array = self.navigationController.viewControllers;
int arrayCount = [array count];
HogeViewController *parent = [array objectAtIndex:arrayCount - 2];
objectiAtIndexは -2 にすると呼び出し元になる
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