• 方式1(自我感觉不到迫不得已慎用，可能会造成层级架构错误)：返回到AS_ZBPersonnelAssessmentDetailVC控制器。弊端：无法返回到导航控制器中最外层的控制器，可以利用方式2解决

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

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

            [self.navigationController popToViewController:VC animated:NO];
        }
 }

-方式2：因为控制器都是压栈进去的，所以第0个最先push的控制器
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];

返回到前两个界面

NSInteger indexValue = (NSInteger)[[self.navigationController viewControllers] indexOfObject:self];
if (indexValue > 2) {
       [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:(indexValue - 2)] animated:YES];
}