<# Base use #>
  
        Model:
        @interface RYUser : NSObject
        @property (nonatomic, strong) NSString *name;
        @property (nonatomic, assign) int age;
        @property (nonatomic, assign) BOOL sex;
        @end 
        @implementation RYUser 
        @end

        JSON:
        NSDictionary *aDic = @{@"name":@"resory",
                               @"age":@(29),
                               @"sex":@true,
                               @"grade":@"A"};

        Transform: 
        RYUser *user = [RYUser ry_modelWithKeyValue:aDic];
        NSLog(@"%@,%d,%d",user.name,user.age,user.sex);
        // resory,29,1
  
  <# Model contain model #>
  
        Model:
        @interface RYUser : NSObject
        @property (nonatomic, strong) NSString *name;
        @property (nonatomic, assign) int age;
        @property (nonatomic, assign) BOOL sex;
        @property (nonatomic, strong) RYCourse *course;
        @end
        @implementation RYUser 
        @end
        
        @interface RYCourse : NSObject
        @property (nonatomic, assign) CGFloat english;
        @end
        @implementation RYCourse
        @end

        JSON:
        NSDictionary *aDic = @{
                                @"name":@"resory",
                                @"age":@(29),
                                @"sex":@true,
                                @"grade":@"A",
                                @"course":@{
                                                  @"english":@(100)
                                           }
                                }

          Transform: 
          RYUser *user = [RYUser ry_modelWithKeyValue:aDic];
          NSLog(@"%@,%d,%d,%f",user.name,user.age,user.sex,user.course.english);
          //resory,29,1,99.500000   
          
  <# JSON name not map Model property name #>
        
        Model:
        @interface RYUser : NSObject
        @property (nonatomic, strong) NSString *aName;
        @property (nonatomic, assign) int age;
        @property (nonatomic, assign) BOOL sex;
        @end
        @implementation RYUser
        - (NSDictionary *)ry_modelMapPropertyNames
        {
            return @{@"aName":@"name"};
        }
        @end
        
        JSON:
        NSDictionary *aDic = @{@"name":@"resory",
                               @"age":@(29),
                               @"sex":@true,
                               @"grade":@"A"};
        
        Transform: 
        RYUser *user = [RYUser ry_modelWithKeyValue:aDic];
        NSLog(@"%@,%d,%d",user.aName,user.age,user.sex);
        // resory,29,1

  Model:
  @interface RYUser : NSObject
  @property (nonatomic, strong) NSString *name;
  @property (nonatomic, assign) int age;
  @property (nonatomic, assign) BOOL sex;
  @end 
  @implementation RYUser 
  @end
  
  JSONString:
  NSString *jsonString = @"{\"name\":\"Resory\", \"sex\":true, \"age\":30}";
  
  Transform:
  RYUser *user = [RYUser ry_modelWithKeyValueString:jsonString];
  NSLog(@"%@,%d,%d",user.name,user.age,user.sex);
  // Resory,30,1

  Model:
  @interface RYUser : NSObject
  @property (nonatomic, strong) NSString *name;
  @property (nonatomic, assign) int age;
  @property (nonatomic, assign) BOOL sex;
  @end 
  @implementation RYUser 
  @end
  
  JSONs:
  NSDictionary *aDic = @{@"name":@"resory",
                       @"age":@(29),
                       @"sex":@true,
                       @"grade":@"A"};
  NSDictionary *bDic = @{@"name":@"jack",
                         @"age":@30,
                         @"sex":@false,
                         @"grade":@"D"}
  NSArray *aArr = @[aDic,bDic];
  
  Transform:
  NSArray *users = [RYUser ry_modelsWithKeyValues:aArr];
  for (RYUser *user in users) {
      NSLog(@"%@,%d,%d",user.aName,user.age,user.sex);
  }
  // resory,29,1
  // jack,30,0

  Model:
  @interface RYUser : NSObject
  @property (nonatomic, strong) NSString *name;
  @property (nonatomic, assign) int age;
  @property (nonatomic, assign) BOOL sex;
  @end 
  @implementation RYUser 
  @end
  
  Transform:
  RYUser *tUser = [RYUser new];
  tUser.aName = @"Resory";
  tUser.age = 10;
  tUser.sex = YES;
  NSDictionary *tDic = [tUser ry_modelToKeyValue];
  NSLog(@"%@",tDic);
  // {name = Resory; age = 10; sex = 1;}

  Model:
  @interface RYUser : NSObject
  @property (nonatomic, strong) NSString *name;
  @property (nonatomic, assign) int age;
  @property (nonatomic, assign) BOOL sex;
  @end 
  @implementation RYUser 
  @end
  
  Transform:
  RYUser *tUser = [RYUser new];
  tUser.aName = @"Resory";
  tUser.age = 10;
  tUser.sex = YES;

  RYUser *aUser = [RYUser new];
  aUser.aName = @"jack";
  aUser.age = 20;
  aUser.sex = NO;

  NSArray *uers = @[tUser,aUser];
  NSArray *dics = [uers ry_modelsToKeyValues];
  for (NSDictionary *dic in dics) {
     NSLog(@"%@",dic);
  }
  // {name = Resory;age = 10;sex = 1;}
  // {name = jack;age = 20;sex = 0;}