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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