iOS 页面pop回到第一级页面的方法

KirsViewController * aaVC = nil;

     for (UIViewController * VC in self.navigationController.viewControllers) {

      if ([VC isKindOfClass:[KirsViewController class]]) {

            aaVC = (KirsViewController *)VC;

         }

      }

[self.navigationController popToViewController:aaVC animated:YES];