object 枚举类型

typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {

        UIViewAutoresizingNone                 = 0,

        UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,

        UIViewAutoresizingFlexibleWidth        = 1 << 1,

        UIViewAutoresizingFlexibleRightMargin  = 1 << 2,

        UIViewAutoresizingFlexibleTopMargin    = 1 << 3,

        UIViewAutoresizingFlexibleHeight       = 1 << 4,

        UIViewAutoresizingFlexibleBottomMargin = 1 << 5

};

简单的数据的偏移

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