枚举和结构体

1.枚举类型

//推荐的定义枚举类型的方式typedef NS_ENUM(NSInteger, RWTLeftMenuTopItemType) {    RWTLeftMenuTopItemMain,    RWTLeftMenuTopItemShows,    RWTLeftMenuTopItemSchedule  };  typedef NS_ENUM(NSInteger, RWTGlobalConstants) {    RWTPinSizeMin = 1,    RWTPinSizeMax = 5,    RWTPinCountMin = 100,    RWTPinCountMax = 500,  };  //不推荐的方式enum GlobalConstants {    kMaxPinSize = 5,    kMaxPinCount = 500,  };  
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2.结构体

 //1.定义一个Sample结构体    struct Sample {        int a;        int b;        int c;    };    //初始化的时候，可以这样赋值    struct Sample sampleStruct = {1, 2, 1};    NSLog(@"sampleStruct中的值%d",sampleStruct.a );   //2 .定义一个Sample结构体    struct Sample{        int a;        int b;        int c;    }sampleStruct;    typedef struct Sample MySampleStruct;    //以后用这个结构体，就可以直接用MySampleStruct去定义了    MySampleStruct samDefineStructVarible = {1,2,1};    samDefineStructVarible.a = 1;    samDefineStructVarible.b =2;    samDefineStructVarible.c = 3;
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