字典转模型（runtime）

接口返回的key转成属性名

+ (NSDictionary*)lj_replacedKeyWithProperty {
    return @{@"propertyName":@"key"};
}

model中嵌套子model

+ (NSDictionary*)lj_modelWithArrayObject { 
    return @{@"key":@"subModel"}; 
}

字典转模型

+ (instancetype)lj_modelWithDict:(NSDictionary*)dict { 

     id objc = [[self alloc] init]; 

     unsigned int count = 0; 

     Ivar *ivar = class_copyIvarList(self, &count); 

     for(int i = 0; i < count; i ++) { 

     Ivar iva = ivar[i]; 

     NSString *name = [NSString stringWithUTF8String:ivar_getName(iva)]; 

     NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(iva)]; 

     type = [type stringByReplacingOccurrencesOfString:@"\""withString:@""]; 

    type = [type stringByReplacingOccurrencesOfString:@"@"withString:@""]; 

    name = [name substringFromIndex:1]; 

   NSString *key = [NSString stringWithString:name]; 

   if([self respondsToSelector:@selector(lj_replacedKeyWithProperty)]) { 

          NSString *object = [[self lj_replacedKeyWithProperty] objectForKey:key]; 

          if(object) { 

               key = object; 

          } 

     } 

          id value = dict[key]; 

          if(!value) { 

               continue; 

          }

     if([self respondsToSelector:@selector(lj_modelWithArrayObject)]) {

          if([[[self lj_modelWithArrayObject] allKeys] containsObject:name]) {

              NSString *object = [[self lj_modelWithArrayObject] valueForKey:name];

               Class subClass = NSClassFromString(object);

               if([value isKindOfClass:[NSDictionary class]]) {

                    value = [subClass lj_modelWithDict:value];

               } else if ([value isKindOfClass:[NSArray class]]) {

                    NSMutableArray*array = [NSMutableArray new];

                    for(id subDict in value) {

                         id subObject = [subClass lj_modelWithDict:subDict];

                         [array addObject:subObject];

                     }

                    value = [NSArray arrayWithArray:array];

               }
     
           }

          }

     [objc setValue:value forKey:name];

     }

     return objc;

}