如何确定scrollviewer何时结束滚动？ [英] How to determine when the scrollviewer has ended scrolling?

问题描述

我需要在用户完成滚动后将scrollviewer调整到某个点。

iOS的UIScrollView有一些类似的方法

   - （void）scrollViewDidEndScrollingAnimation：（UIScrollView *）scrollView时调用scrollview 
 
  - （void）scrollViewDidEndDecelerating :( UIScrollView *）scrollView 
 
  - （void）scrollViewDidEndDragging：（UIScrollView *）scrollView willDecelerate：（BOOL）减速
  

我尝试了 ViewChanging 和 ViewChanged ，但是同时处理这两个事件的问题是他们一个接一个。如下：

查看更改

查看更改

查看更改

查看已更改

..

..

而不是 -

查看更改

查看更改

查看更改

查看更改

查看更改

有没有办法我可以获得当scrollviewer完成滚动或完成滚动通过拖动的通知？

请帮助。

解决方案

• 1.捕获 MouseWheel 事件。


• 启动 MouseWheel 的事件处理程序中的一个线程，这将计算时间来提升自定义事件，例如 FinishedScrolling


• 3.如果在定时器完成之前发生 MouseWheel 事件，意味着滚动'/'>
  

怎么办？它不应该占用太多的代码，如果你使用MVVM，你可以使用附加行为。

I need to adjust the scrollviewer to some point after the users has completed scrolling. For that i need to get to listen to when the scrolling has ended.

iOS's UIScrollView has some similar methods

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView that is called when the scrollview

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

I tried ViewChanging and ViewChanged, But problem with handling both events simultaneously is that they occur one after another. Like following:

view changing

view changed

view changing

view changed

..

..

instead of -

view changing

view changing

view changing

view changing

view changed

Is there any way i can get the notification for when the scrollviewer has done scrolling or done scrolling-through-dragging?

Please help.

解决方案

What You could do is :

• 1.Capture MouseWheel event.
• 2.Fire up a thread in the event handler of MouseWheel, that would count time to raise a custom event of yours like FinishedScrolling
• 3.If a MouseWheel event gets raised before the timer finishes, that means that the scrolling isn't done and you should terminate your timer-thread and start it again.

How's that ? It shouldn't take up too much code and if you're using MVVM you could use an Attached Behaviour.

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