typedef struct {
    Byte _fieldNumber;
    Byte _fieldLabel;
    Byte _fieldType;
    BOOL _isPacked;
    int _enumInitValue;
    union {
        __unsafe_unretained NSString* _messageClassName;
        __unsafe_unretained Class _messageClass; // ClassName对应的Class
        IsEnumValidFunc _isEnumValidFunc; // 检测枚举值是否合法函数指针
    };
} PBFieldInfo;

class PBClassInfo {
public:
    PBClassInfo(Class cls, PBFieldInfo* fieldInfo);
    ~PBClassInfo();

public:
    unsigned int _numberOfProperty;
    std::string* _propertyNames;
    size_t* _propertyNameHashes;
    std::string* _getterObjCTypes;
    std::string* _setterObjCTypes;

    PBFieldInfo* _fieldInfos;
};

@interface WXPBGeneratedMessage () {
    uint32_t _has_bits_[3]; // 最多96个属性，表示属性是否有赋值
    int32_t _serializedSize;
    PBClassInfo* _classInfo;
    id* _ivarValues;
}
- (NSMethodSignature*) methodSignatureForSelector:(SEL) aSelector;
- (void) forwardInvocation:(NSInvocation*) anInvocation;
- (void) setValue:(id) value forUndefinedKey:(NSString*) key;
- valueForUndefinedKey:(NSString*) key;
@end

message GameResourceReq {
    required BaseRequest BaseRequest = 1;
    required int32 PropsCount = 2;
    repeated uint32 PropsIdList = 3[packed=true];
}
// 老实现
@implementation GameResourceReq

@synthesize hasBaseRequest;
@synthesize baseRequest;
@synthesize hasPropsCount;
@synthesize propsCount;
@synthesize mutablePropsIdListList;
@dynamic propsIdList;

- (id) init {...}
- (void) SetBaseRequest:(BaseRequest*) value {...}
- (void) SetPropsCount:(int32_t) value {...}
- (NSArray*) propsIdListList {...}
- (NSMutableArray*)propsIdList {...}
- (void)setPropsIdList:(NSMutableArray*) values {...}
- (BOOL) isInitialized {...}
- (void) writeToCodedOutputStream:(PBCodedOutputStream*) output {...}
- (int32_t) serializedSize {...}
+ (GameResourceReq*) parseFromData:(NSData*) data {...}
- (GameResourceReq*) mergeFromCodedInputStream:(PBCodedInputStream*) input {...}
- (void) addPropsIdList:(uint32_t) value {...}
- (void) addPropsIdListFromArray:(NSArray*) values {...}
@end
// 新实现
@implementation GameResourceReq

PB_PROPERTY_TYPE baseRequest;
PB_PROPERTY_TYPE opType;
PB_PROPERTY_TYPE brandUserName;

+ (void) initialize {
  static PBFieldInfo _fieldInfoArray[] = {
    {1, FieldLabelRequired, FieldTypeMessage, NO, 0, ._messageClassName = STRING_FROM(BaseRequest)},
    {2, FieldLabelRequired, FieldTypeInt32, NO, 0, 0},
    {3, FieldLabelRepeated, FieldTypeUint32, NO, 0, 0},
  };
  initializePBClassInfo(self, _fieldInfoArray);
}
@end