tencent cloud

// If `isPinned` is `YES`, the conversation is pinned to the top; otherwise, it is not.
NSString *conversationID = @"conversationID";
[[V2TIMManager sharedInstance] pinConversation:conversationID isPinned:YES succ:^{
    NSLog(@"success");
} fail:^(int code, NSString *desc) {
    NSLog(@"failure, code:%d, desc:%@", code, desc);
}];

class Callback final : public V2TIMCallback {
public:
    using SuccessCallback = std::function<void()>;
    using ErrorCallback = std::function<void(int, const V2TIMString&)>;

    Callback() = default;
    ~Callback() override = default;

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

    void OnSuccess() override {
        if (success_callback_) {
            success_callback_();
        }
    }
    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_;
};

V2TIMString conversationID = u8"conversationID";
bool isPinned = true;

auto callback = new Callback;
callback->SetCallback(
    [=]() {
        // The conversation is pinned to top successfully.
        delete callback;
    },
    [=](int error_code, const V2TIMString& error_message) {
        // Failed to pin the conversation to the top.
        delete callback;
    });

V2TIMManager::GetInstance()->GetConversationManager()->PinConversation(conversationID, isPinned, callback);

- (void)onConversationChanged:(NSArray<V2TIMConversation*> *) conversationList {
    for (V2TIMConversation *conv in conversationList) {
        if ([conv.conversationID isEqualToString:self.conversationData.conversationID]) {
            // `conv.isPinned` is the pinned status.
        }
    }
}