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// Constants.h extern NSString * const MyOwnConstant; extern NSString * const YetAnotherConstant;
最后，在Constants.m中通过赋值定义常量:
Constants.m
// Constants.m NSString * const MyOwnConstant = @"myOwnConstant"; NSString * const YetAnotherConstant = @"yetAnotherConstant";
Objective-C 静态常量
原文地址：http://www.cnblogs.com/scaptain/p/4087643.html
