如何从 NavigationController 堆栈将消息发送回 UIScrollView？
我的视图控制器的结构如下：
> UIWindow
> - RootViewController with UIScrollView (2 pages, pagingEnabled)
> -- UINavigationController (in the first page of the scrolling view)
> --- HomePageViewController (plus other ViewControllers pushed on the stack)
> -- MinutiaViewController (second page)
UIScrollView 将 UInavigationController 作为子视图 [scrollView addSubview:navController.view];
在我的场景中我想：
- 将新视图推送到 UINavigationViewController 后禁用 UIScrollView 滚动 (scrollEnable=NO)
- 一旦弹出新视图并且 UINavigationController 再次显示其根，再次启用 UIScrollView (scrollEnable=YES) (HomePageViewController)
我想出了如何在推送新视图时禁用scrollView滚动。
但是无法弄清楚当新视图从堆栈中弹出时如何启用scrollView滚动。
到目前为止我尝试过
1 触发viewWillAppear；视图将消失；手动并发送 从 HomePageViewController 的 viewWillAppear 发送到 UIScrollView 的消息 例如
[self.navigationController.parentViewController performSelector:@selector(enableScrollAgain)];
2 将 RootViewController 指定为 UINavigationController 委托来处理其 活动
到目前为止似乎都不起作用。感谢所有建议！
My view controllers are structured like this:
> UIWindow
> - RootViewController with UIScrollView (2 pages, pagingEnabled)
> -- UINavigationController (in the first page of the scrolling view)
> --- HomePageViewController (plus other ViewControllers pushed on the stack)
> -- MinutiaViewController (second page)
UIScrollView holds the UInavigationController as a subview[scrollView addSubview:navController.view];
In my scenario I want to:
- disable UIScrollView scrolling (scrollEnable=NO) once a new view is pushed onto the UINavigationViewController
- enable UIScrollView again (scrollEnable=YES) once the new view is popped and the UINavigationController shows its root again
(HomePageViewController)
I figured out how to disable the scrollView scrolling when pushing a new view.
But cannot figure out how to enable the scrollView scrolling when the new view pops off the stack.
So far I tried
1 triggering viewWillAppear; viewWillDisappear; manually and sending a
message to UIScrollView from HomePageViewController's viewWillAppear
e.g.
[self.navigationController.parentViewController performSelector:@selector(enableScrollAgain)];
2 designated the RootViewController as a UINavigationController delegate to handle its
events
None seems to work so far. All advice appreciated!
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您尝试过使用通知吗？您可以添加 RootView 来观察导航控制器的通知，当您收到该通知时，您可以禁用滚动。查看通知中心。
希望这有帮助
Have you tried using Notifications ? You could add the RootView to observe a notification form the navigation controller, when you get that notification you can disable scrolling. Look into NotificationCenter.
Hope this helps