rootViewController视图属性

Question

我对UIViewControllers有疑问。如果我有一个由以下构成的视图层次结构 - view2是view1的子视图，view3是view2的子视图 - 。要获取视图层次结构，我的rootViewController.view属性将设置为

rootViewController.view = view3;

如果view3和view2在同一级别上，该怎么办？例如，view2和view3是view1的子视图，如何设置rootViewController.view？

由于

Answer 1

NSArray *arrayOfViewControllers = self.navigationController.viewControllers;

//now you can take last viewcontroller from array and set that controller as root view controller like below

rootViewController.view = [arrayOfViewControllers lastObject];