文章详细介绍了在使用下拉刷新类库EGORefreshTableHeaderView时遇到的编译错误，以及如何解决引入框架和正确配置目标构建阶段的问题。包括通过引入QuartzCore.framework和手动添加EGORefreshTableHeaderView.m到目标构建阶段来解决编译失败的情况。
1， 在使用下拉刷新类库EGORefreshTableHeaderView的时候，将资源文件添加到工程中，但是忘记假如QuartzCore.framework框架，造成编译错误：
Undefined symbols for architecture i386:
"_CATransform3DMakeRotation", referenced from:
-[EGORefreshTableHeaderView setState:] in EGORefreshTableHeaderView-6F75314CE1079327.o
"_OBJC_CLASS_$_CALayer", referenced from:
objc-class-ref in EGORefreshTableHeaderView-6F75314CE1079327.o
"_OBJC_CLASS_$_CATransaction", referenced from:
objc-class-ref in EGORefreshTableHeaderView-6F75314CE1079327.o
"_CATransform3DIdentity", referenced from:
-[EGORefreshTableHeaderView setState:] in EGORefreshTableHeaderView-6F75314CE1079327.o
"_kCAGravityResizeAspect", referenced from:
-[EGORefreshTableHeaderView initWithFrame:arrowImageName:textColor:] in EGORefreshTableHeaderView-6F75314CE1079327.o
"_kCATransactionDisableActions", referenced from:
-[EGORefreshTableHeaderView setState:] in EGORefreshTableHeaderView-6F75314CE1079327.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
2，框架已经引入还出现编译失败：
在项目中引入EGORefreshTableHeaderView
的时候，编译出错：
Undefined symbols for architecture i386:
“_OBJC_CLASS_$_EGORefreshTableHeaderView”, referenced from:
objc-class-ref in MyMenuViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
开始以为是缺少库，排查一遍，未发现问题。后来在stackoverflow上查到原因是引入的时候xcode未把
EGORefreshTableHeaderView.m加入到target->build phase->compile sources,手动添加即可
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