Undefined symbols for architecture armv7: "_OBJC_CLASS_$_Crashlytics", referenced from: objc-class-ref in AppDelegate.oUndefined symbols for architecture armv7: "_OBJ
阅读背景：
架构armv7的未定义符号：“_ OBJC_CLASS _ $ _ Crashlytics”，引自：AppDelegate.o中的objc-class-ref
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