iOS 控制器多级Pop

有时候开发中需要从VC1 push 到VC2,再从VC2 push 到VC3, VC3完成某件事情后直接 pop到VC1(甚至更深层次pop)

方案1：利用控制器index

int index = (int)[[self.navigationController viewControllers]indexOfObject:self];
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:(index -2)] animated:YES];

方案2：反向遍历(降序遍历)

[self.navigationController.viewControllers enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

 if ([obj isKindOfClass:[VC1 class]]||[obj isKindOfClass:[VC0 class]])
 { 
     [self.navigationController popToViewController:obj animated:YES];
     *stop = YES;
 }
}];