V2TIMGroupMemberSearchParam *param = [[V2TIMGroupMemberSearchParam alloc] init];
param.keywordList = @[@"keyword1", @"keyword2"];
param.keywordListMatchType = V2TIM_KEYWORD_LIST_MATCH_TYPE_OR;
param.groupIDList= @[@"groupID"];
param.searchCount = 20;
param.searchCursor = "";
[[V2TIMManager sharedInstance] searchCloudGroupMembers:param succ:^(V2TIMGroupMemberSearchResult *searchResult) {
    // Search Group Member succ
} fail:^(int code, NSString *desc) {
    // Search Group Member failed
}];

template <class T>
class ValueCallback final : public V2TIMValueCallback<T> {
public:
    using SuccessCallback = std::function<void(const T&)>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

    ValueCallback() = default;
    ~ValueCallback() override = default;

    void SetCallback(SuccessCallback success_callback, ErrorCallback error_callback) {
        success_callback_ = std::move(success_callback);
        error_callback_ = std::move(error_callback);
    }

    void OnSuccess(const T& value) override {
        if (success_callback_) {
            success_callback_(value);
        }
    }
    void OnError(int error_code, const V2TIMString& error_message) override {
        if (error_callback_) {
            error_callback_(error_code, error_message);
        }
    }

private:
    SuccessCallback success_callback_;
    ErrorCallback error_callback_;
};

V2TIMGroupMemberSearchParam param;
param.keywordList = keywordList;
param.keywordListMatchType = V2TIM_KEYWORD_LIST_MATCH_TYPE_OR;
param.groupIDList = groupIDList;
param.searchCount = 20;
param.searchCursor = "";

auto callback = new ValueCallback<V2TIMGroupMemberSearchResult>{};
callback->SetCallback(
    [=](const V2TIMGroupMemberSearchResult& groupMemberSearchResult) {
        // Search Group Member succ
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Search Group Member failed
        delete callback;
    });

V2TIMManager::GetInstance()->GetGroupManager()->SearchCloudGroupMembers(param, callback);