什么原因导致iOS链接错误？ [英] What causes iOS linking errors?

问题描述

我在XCode中遇到了一些奇怪的链接错误。我或多或少地了解链接错误是什么，而不是为什么它们出现在我的情况中。

I've been getting some strange linking errors in XCode. I understand more or less what linking errors are, just not why they are showing up in my situation.

我有一个仅作为iPhone启动的应用程序。当我将其调整为通用时，我得到了一些奇怪的链接错误。然后我简单地创建了一个新的通用项目并导入了文件，它构建并执行时没有错误。现在，使用iPad界面，我添加了一些动画并继承了QuartzCore / QuartzCore.h但是当我构建时，我得到了链接错误（如下所示）。导致此类问题的原因是，我该如何修复它，以及如何在将来避免它？

I have an app that started as iPhone only. When I adjusted it to be universal I got some odd linking errors. I then simply created a new universal project and imported the files, it built and executed without error. Now, working with the iPad interface, I've added some animations and am inheriting QuartzCore/QuartzCore.h but when I build, I get linking errors (shown below). What causes this sort of problem, how can I fix it, and how can I avoid it in the future?

"_OBJC_CLASS_$_CAMediaTimingFunction", referenced from:
objc-class-ref-to-CAMediaTimingFunction in mainViewController_iPad.o

"_OBJC_CLASS_$_CABasicAnimation", referenced from:
objc-class-ref-to-CABasicAnimation in mainViewController_iPad.o

"_kCAMediaTimingFunctionEaseIn", referenced from:
_kCAMediaTimingFunctionEaseIn$non_lazy_ptr in mainViewController_iPad.o
(maybe you meant: _kCAMediaTimingFunctionEaseIn$non_lazy_ptr)

"_OBJC_CLASS_$_CAKeyframeAnimation", referenced from:
objc-class-ref-to-CAKeyframeAnimation in mainViewController_iPad.o

"_OBJC_CLASS_$_CAAnimationGroup", referenced from:
objc-class-ref-to-CAAnimationGroup in mainViewController_iPad.o

"_CATransform3DIdentity", referenced from:
_CATransform3DIdentity$non_lazy_ptr in mainViewController_iPad.o
(maybe you meant: _CATransform3DIdentity$non_lazy_ptr)

ld: symbol(s) not found
collect2: ld returned 1 exit status

推荐答案

您需要添加 QuartzCore.framework 。

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