1.UINavigationController
popToViewController 对应popViewControllerAnimated:
也可以使用:
[self.navigationController popToRootViewControllerAnimated:YES]
[self.navigationController popToViewController:vc animated:YES];
UIViewControllerA *aVC = [UIViewControllerA alloc] init]l;
[self.navigationController popToViewController: aVC animated:YES];
[self.navigationController popViewControllerAnimated:YES]
2.
presentModalViewControllerAnimated对应dismissModalViewControllerAnimated
原文：http://www.cnblogs.com/apem/p/4125936.html
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