iOS 中的语义缩放
如何在 iOS4 中创建语义缩放类型界面？我所说的语义缩放是指，当用户放大某个对象时，它会显示越来越多的细节，缩小时反之亦然。
任何提示表示赞赏，谢谢！
How would one go about creating a semantic zoom type interface in iOS4? By semantic zoom I mean that as the user zooms in on an object it reveals more and more details, and vice versa when zooming out.
Any tips appreciated, thanks!
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我认为有一个 WWDC 会议视频对此进行了介绍，它使用了 UIScrollView 和平铺。当用户缩放时，图块上会显示更详细的图像。观看会议视频（链接位于开发者中心，您需要一个开发者帐户）。
I think there was a WWDC session video on this and it used a UIScrollView and tiling. When the user zoomed a more detailed image was shown on the tiles. Take a look at the session videos (link is in the developer center and you will need a developer account).
Apple 提供的“PhotoScroller”示例代码具有效果很好的平铺缩放技术。我在多个应用程序中重复使用了它。它依赖于CATiledLayer。下载示例代码，您应该拥有您需要的内容。
The "PhotoScroller" sample code provided by Apple has a tiled zoom technique that works very well. I have reused it across multiple apps. It relies on CATiledLayer. Download the sample code and you should have what you need.