🐞NSInternalInconsistencyException

Bug名称
'NSInternalInconsistencyException' 内部不一致
reason: 'Tried to pop to a view controller that doesn't exist.'
翻译:
试着将view controller pop(出栈)时,没有找到它.

Bug的产生原因?
- 需求: 我想要,在navigationController - 导航控制器里,切换到指定的子控制器.
- 原因:
  - OneViewController是新建的控制器,并不是已经在当前的navigationController - 导航控制器里,
  - - popToViewController: 方法,切换控制器,有个前提,那就是,必须已经在"导航控制器里的子控制器",才能切换.
```
OneViewController *oneVC = [[OneViewController alloc]init];
[self.navigationController popToViewController:oneVC animated:YES];
```

Bug的解决方案?

-- 获取当前导航控制器里,所有的子控制器
NSArray<UIViewController *>* dataVC = self.navigationController.childViewControllers;

-- 切换到指定的子控制器.如: 'dataVC[1]'
[self.navigationController popToViewController:dataVC[1] animated:YES];