Written by Mattt February 10th, 2014 This article has been translated into: 中文 #import <objc/runtime.h> Objective-C developers are conditioned to be wary of whatever follows this ominous incantation. And for good reason: messing with the Objective-C runtime changes the very fabric of reality for all of the code that runs on it. In the right hands, the functions of <objc/runtime.h> have the potenti