检测 UIScrollView 何时在某个点查看并执行操作
我正在尝试弄清楚如何做到这一点。已经被困在这个问题上很长一段时间了。我试图检测 UIScrollView 何时处于完美位置并执行操作。这里我有一个 UIScrollView 与里面的图像对齐，如下所示。 http://cl.ly/66yW 现在，如果您看第一张图片上方，会看到一个小三角形。该三角形指示将执行什么操作，或者仅指示将使用哪种 URL 缩短服务。现在，当用户滚动到下一个服务时，我想将该服务设置为将缩短 URL 的服务。 http://cl.ly/67cA
我该如何执行此操作？ 欢迎任何完成此操作的代码或链接。
谢谢
编辑： 好的，所以我认为要获得捕捉效果，我需要启用分页。现在，我是否可以像图片中那样为每个页面设置自己的服务，并将它们全部签名，以便用户可以看到服务从屏幕上消失，就像我在图片中一样？比如，Rfly.Me 是一个页面，CloudApp 是另一个页面等等，但它们的布局是否与上图所示完全一致？
I'm trying to figure out how to do this. Been stuck on this for a really ling time. I'm trying to detect when a UIScrollView is in a perfect location and perform an action. Here I have a UIScrollView aligned with images inside like this. http://cl.ly/66yW now if you look above the first image there is a little triangle. That triangle indicates what action will be performed or only case which URL shortening service will be used. Now when the user scrolls to the next one I'd like to set that service as the service which the URL will be shortened with. http://cl.ly/67cA
How do I go about doing this?
Any code or links to complete this are welcomed.
Thanks
Edit:
Okay So I gather to get that snapping effect I need paging enabled. Now is it possible for me to set each page its own service like I have in the pictures and keep them all signed lie that so the user can see services fade off the screen like I have it? So like, Rfly.Me is one page, CloudApp is another etc etc etc but also have them lay out exactly as they are shown in the pictures above?
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这是一个详细说明（主要）您要查找的内容的示例：
http ://code.davidjanes.com/blog/2009/09/26/uipagecontrol-uiscrollview/
编辑：刚刚找到一个可以完成您正在查找的操作的嵌入式类 为了。我只是将其发布在这里以供将来参考：
http://cocoacontrols.com/platforms/ios/控件/v8horizontalpickerview
Here's an example that details (mostly) what you're looking for:
http://code.davidjanes.com/blog/2009/09/26/uipagecontrol-uiscrollview/
Edit: Just found a drop-in class that does what you're looking for. I'm just posting this here for future reference:
http://cocoacontrols.com/platforms/ios/controls/v8horizontalpickerview
我认为你可以使用：
然后检查scrollView.contentOffset.x并将其与云的位置进行比较。
您可能会发挥创意，如果偏移量在云位置的 +/-10 之间，则会自动将自身动画化为“单击”到云上方的位置
I think you can use:
And then check the scrollView.contentOffset.x and compare it to the position of your cloud.
You might get creative so that if the offset is between +/-10 of the cloud position is automatically animates itself to "click" into position above the cloud