IOS开发报错之Undefined symbols for architecture armv6

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今天在项目中引入SVSegmentedControl.h/.my以及SVSSegmentedThumb.h/.m之后应用引入类，编译时候报错

Undefined symbols for architecture armv6:

  "_OBJC_CLASS_$_SVSegmentedControl", referenced from:

      objc-class-ref in SVSegmentedControl.o

ld: symbol(s) not found for architecture armv6

Undefined symbols for architecture armv6:

  "_OBJC_CLASS_$_SVSSegmentedThumb", referenced from:

      objc-class-ref in SVSSegmentedThumb.o

ld: symbol(s) not found for architecture armv6

这种情况一般是库引用的问题，解决办法选择工程的TARGETS-->Build Phases-->Link Binary With Libraries 点击“+”图标添加对应的库。

但是在此地的原因其实也是这样，编译时候找不到对应的类，所以需要我们在Build Phases-->Compile Sources中手动添加SVSegmentedControl.my以及SVSSegmentedThumb.m两项，之后clean项目，重新编译即可。

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