如何在 PDF 中缩放并在一个滚动视图页面中显示两个页面？
我想在 ipad 上以纵向模式显示每页 pdf，并在旋转到横向模式时显示两页。我在互联网上进行了搜索，但找不到任何解决方案。我想到了两种可能的方法。
1.使用webview，但我不知道如何在一个webview中显示两个页面。
2.使用CGPDF API读取两页并合并为一个pdf文件。但我认为这可能会很慢并且不确定这是否可以做到。
或者任何其他方式可以解决这个问题？谢谢！！
I want show per page pdf in portait mode and display two pages when rotate to landscape mode on ipad . I had search on internet and can't find any solution. I thought two possible way.
1.Using webview but I don't know how to display two page in one webview in a webview.
2.Using CGPDF API read from two page and merge to one pdf file. But I think this may be very slow and not sure if this could do it .
or any other way could solve this problem? Thanks!!
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我认为在那里使用 UIWebView 不会取得太大成功。然而，没有什么可以阻止您将两个 CATiledLayer 放入 UIView 中并将它们并排显示。事实上，这正是我在 iOS PDF 解析框架中所做的。
只需将 contentView 设置为包含两个平铺层的 containerView，它们就可以完美地协同工作。不过，请注意您的内存，我不会允许它们同时渲染 pdf，这很可能会因内存不足而导致您的应用程序崩溃。 （绘制PDF确实是资源密集型的）
I don't think you will have much success with using a UIWebView there. There's however nothing stopping you from putting two CATiledLayers into a UIView and display them next to each other. In fact, that's exactly what I did in my iOS PDF parsing framework.
Just set the contentView as the containerView, that includes both tiled layers, and they work perfectly together. Keep an eye on your memory though, I wouldn't allow them both rendering pdf at the same time, that most likely crashes your app due to low memory. (Drawing a PDF is really resource intensive)