iPhone - 访问父视图控制器？
我有2个视图控制器A，B
- 视图控制器A正在显示 屏幕上
- ViewController B的视图是 添加到ViewController的视图中 A.
如何在不传递指针的情况下从 ViewController B 访问 ViewController A？
self.parentViewController 不起作用它返回 null
I have 2 viewcontrollers A, B
- ViewController A is being displayed
on the screen - The view of ViewController B is
added to the view of ViewController
A.
How can i access ViewController A from ViewController B without passing a pointer?
self.parentViewController does not work it returns nuil
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为什么viewController B的视图会被添加到viewController A的视图中呢？如果您打算向 viewController A 添加一个视图，您可以通过分配一个新的 UIView 并将其显示在当前视图的顶部来实现。
另一方面，如果您尝试从一个视图控制器转换到另一个视图控制器，即从 A 到 B，然后再返回到 A，则应该使用 Apple 文档中的视图控制器编程指南中指定的 UINavigationController。
来源： 视图控制器编程指南
编辑：如果你想使用
[[selfparentViewController]yourMethodHere];你将需要一个视图层次结构，为此你可以使用UINavigationController。在您当前的方案中，没有构建层次结构，因此没有父视图控制器。Why is the view of viewController B added to the view of viewController A? If you are meaning to add a view to viewController A, you can do that by allocating a new UIView and displaying that on top of the current view.
On the other hand if you are trying to transition from one view controller to another, i.e going from A to B and then back to A, you should use a UINavigationController as specified in the View Controller Programming Guide in the Apple Documentation.
Source: View Controller Programming Guide
EDIT: If you want to use
[[self parentViewController] yourMethodHere];you will need a view hierarchy, for which you can use the UINavigationController. In your current scheme there is no hierarchy built so there is no parent view controller.这应该可以工作，尽管它不是很优雅：
This should work though its not very elegant: