Iphone 自定义滚动视图指示器
我目前正在为客户开发一个应用程序，他们提出了一个奇怪的请求。该请求涉及将自定义图像作为滚动视图的指示器。我什至不确定这是否可能，但如果可以，请让我知道如何做到这一点。
谢谢
I am currently working on an application for a client, and they have made an odd request. The request involves putting a custom image as the indicator for the scrollview. I am not even sure if this is possible but if it is can you please let me know how one would go about doing that.
Thanks
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UIScrollView拉伸一个小的半透明圆形图像以生成其滚动条。您可以找到此图像作为UIScrollView的第一个子视图：但是，正如我所说，此图像被拉伸，并且据我所知，在绘制滚动条时仅考虑 alpha 值。
因此，例如，如果您只对更改滚动条的顶部/底部感兴趣，则可以尝试更改此图像。然而，我怀疑你能否做任何有趣的事情。
我想到的一个可能的解决方案（这只是一个理论）是在
UIScrollView之上添加一个自定义的、透明的UIView。然后您可以隐藏默认滚动条（通过使用showsHorizontalScrollIndicator和showsVerticalScrollIndicator），将必要的触摸事件传递给UIScrollView来滚动内容，并在您的自定义视图中绘制滚动条。UIScrollViewstreches a small, semi-transparent circle image to generate its scrollbars. You can find this image as the first subview of aUIScrollView:However, as I said this image is stretched, and as far as I can tell, only the alpha values are considered when drawing the scroll bars.
So for example if you're only interested in changing the top/bottom ends of the scroll bar, you can try to change this image. However, I doubt you'll be able to do anything interesting.
A possible solution that comes to mind, and this is only a theory, is to add a custom, transparent
UIViewon top of aUIScrollView. Then you can hide the default scroll bar (by usingshowsHorizontalScrollIndicatorandshowsVerticalScrollIndicator), pass the necessary touch events to theUIScrollViewto scroll the content, and draw the scrollbars in your custom view.