有A–> B –> C,正常返回上一界面
[self.navigationController popViewControllerAnimated:YES];
可以如果由C直接返回A的话，就需要用下面的方法
首先自定义backBarButtonItem
UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"icon_back_black"] style:UIBarButtonItemStylePlain target:self action:@selector(backAction)];
self.navigationItem.leftBarButtonItem = leftItem;
自定义backBarButtonItem参照：https://blog.csdn.net/wlaizff/article/details/51592105
NSInteger index=[[self.navigationController viewControllers]indexOfObject:self];
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:index-2]animated:YES];
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