苹果官方枚举建议用 NS_ENUM 和NS_OPTIONS ,详情见https://developer.apple.com/library/ios/releasenotes/ObjectiveC/ModernizationObjC/AdoptingModernObjective-C/AdoptingModernObjective-C.html
苹果官方枚举建议用 NS_ENUM 和NS_OPTIONS ,详情见https://developer.apple.com/library/ios/releasenotes/ObjectiveC/ModernizationObjC/AdoptingModernObjective-C/AdoptingModernObjective-C.html

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