我在 Xcode 中遇到了一些奇怪的链接错误。我大概知道什么是链接错误,但不知道为什么会出现在我的情况中。
我有一个最初只是 iPhone 应用的程序。当我将它调整为通用应用时,出现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文件,它可以无错误地构建和执行。现在,在处理 iPad 接口时,我添加了一些动画并继承了 QuartzCore/QuartzCore.h,但在构建时,我收到了链接错误(如下所示)。这种问题的原因是什么,我该如何解决它,并且在将来如何避免它?
"_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