IOS UIKIT_EXTERN, __attribute__((visibility ("default"))) 是啥玩意
IOSUIKIT_EXTERN,__attribute__((visibility("default")))是啥玩意?转载(http://www.cnblogs.com/fortunely/p/4681635.html)问题提出在学习IOS时候,碰到一个函数NSStringFromCGPoint(UIGeometry.h)其原型是UIKIT_EXTERNNSString*NSStringFromC