NSInteger index=[[self.navigationController viewControllers]indexOfObject:self]; //当前所在级数
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:index]animated:NO];//直接更改index 表示pop几级
NSInteger index=[[self.navigationController viewControllers]indexOfObject:self]; //当前所在级数
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:index]animated:NO];//直接更改index 表示pop几级本文标题：pop 两级/三级 - iOS
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