CATiledLayer 不适用于我的 iOS5 项目
我创建了新的单视图应用程序（使用 iOS 5 sdk 和 Xcode 4.2 开发），该应用程序现在由应用程序委托、视图控制器、scrollView（带有 CATiledLayer）组成。 Storyboard 包含 ViewController ，其中包含 UIScrollView ，该类是 ScrollView （我创建的类）。我的目标是显示大型 PDF 文件，并进行缩放等。我的项目基于苹果的缩放 pdf 示例。当我尝试在 iPad 上运行我的应用程序时，它在链接期间崩溃并向我显示此错误：
Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_CATiledLayer", referenced from:
objc-class-ref in TiledPDFPage.o
那么有人知道，如何避免此错误吗？问题是否有可能是我没有在代码中而是在故事板中创建滚动视图？
I have created new single view application (developing with iOS 5 sdk and Xcode 4.2), the app is now consisted of app delegate, view controller, scrollView (with CATiledLayer). Storyboard contains ViewController that contains UIScrollView which class is ScrollView (class that I have created). My goal is to display large PDF files, with zooming and etc. I based my project on zooming pdf sample from apple. When I try to run my app on iPad it crashes during linking showing me this error:
Undefined symbols for architecture armv7:
"_OBJC_CLASS_$_CATiledLayer", referenced from:
objc-class-ref in TiledPDFPage.o
So does anyone know, how to avoid this error? Is it possible that the problem is in that I didnt create the scrollView in code but in storyboard??
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您是否记得链接 QuartzCore 框架？
您可能在某个地方有这样的导入（可能在您的
TiledPDFPage.m中）：如果是这样，您也必须链接到 QuartzCore 框架中。
QuartzCore.framework是否已在列表中。如果没有，请继续。Did you remember to link the QuartzCore framework?
You probably have an import like this somewhere (Probably in your
TiledPDFPage.m):If so you have to link in the QuartzCore framework too.
QuartzCore.frameworkis already in the list. If not, continue.QuartzCore.framework(you may have to expand the IOS 5 folder).