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NSStringFromSelector(_cmd); // Objective-C
print(__FUNCTION__) // Swift 2
print(#function) // Swift 3
__FILE__, __LINE__, __COLUMN__ and __FUNCTION__ => #file, #line, #column and #function
Swift #function <= _cmd (Objective-C)
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原文地址：http://www.cnblogs.com/ficow/p/5798780.html
