什么原因导致iOS链接错误？

Question

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.

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？

"_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

Answer 1

你需要添加QuartzCore.framework.