Implement 1-on-1 Messaging
1-on-1 messaging requires two users. SendBird identifies each user by User ID. The sample project provides a feature for 1-on-1 messaging where a user can invite another user by obtaining User ID in the open chat channel.
Start Messaging
You need target's User ID in order to start 1-on-1 messaging. Each message in an open chat contains sender's User ID, which can be used to create 1-on-1 messaging.
Open OpenChatChattingViewController.m in Xcode.
Implement tableView:didSelectRowAtIndexPath: to obtain the User ID of the message's sender.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UIAlertController *messageSubMenu;
UIAlertAction *messageAction;
UIAlertAction *messageCancelAction;
if ([[messages objectAtIndex:indexPath.row] isKindOfClass:[SendBirdMessage class]]) {
SendBirdMessage *message = (SendBirdMessage *)[messages objectAtIndex:indexPath.row];
if ([[[message sender] guestId] isEqualToString:[SendBird getUserId]]) {
return;
}
NSString *actionTitle = [NSString stringWithFormat:@"Start messaging with %@", [message getSenderName]];
messageSubMenu = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
messageAction = [UIAlertAction actionWithTitle:actionTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[SendBird startMessagingWithUserId:[[message sender] guestId]];
}];
messageCancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {}];
[messageSubMenu addAction:messageAction];
[messageSubMenu addAction:messageCancelAction];
[self presentViewController:messageSubMenu animated:YES completion:nil];
}
else {
return;
}
}
You can see UIAlertController when you click other's messages in the open chat like this:
If you click "Start messaging with OPPONENT_NAME", then SendBird startMessagingWithUserId: is invoked. When it is invoked, the callback messagingStartedBlock: will be invoked as well. The callback returns SendBirdMessagingChannel object, which allows the user to join the 1-on-1 messaging channel.
You should insert codes for joining a channel in messagingStartedBlock:. Refer to the codes in messagingStartedBlock: for details.
- (void)startChattingWithPreviousMessage:(BOOL)tf
{
[SendBird loginWithUserId:[SendBird deviceUniqueID] andUserName:[MyUtils getUserName] andUserImageUrl:[MyUtils getUserProfileImage] andAccessToken:@""];
[SendBird joinChannel:[currentChannel url]];
[SendBird setEventHandlerConnectBlock:^(SendBirdChannel *channel) {
} errorBlock:^(NSInteger code) {
} channelLeftBlock:^(SendBirdChannel *channel) {
} messageReceivedBlock:^(SendBirdMessage *message) {
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
[self scrollToBottomWithReloading:YES animated:NO];
} systemMessageReceivedBlock:^(SendBirdSystemMessage *message) {
} broadcastMessageReceivedBlock:^(SendBirdBroadcastMessage *message) {
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
[self scrollToBottomWithReloading:YES animated:NO];
} fileReceivedBlock:^(SendBirdFileLink *fileLink) {
if (lastMessageTimestamp < [fileLink getMessageTimestamp]) {
lastMessageTimestamp = [fileLink getMessageTimestamp];
}
if (firstMessageTimestamp > [fileLink getMessageTimestamp]) {
firstMessageTimestamp = [fileLink getMessageTimestamp];
}
if ([fileLink isPast]) {
[messages insertObject:fileLink atIndex:0];
}
else {
[messages addObject:fileLink];
}
[self scrollToBottomWithReloading:YES animated:NO];
} messagingStartedBlock:^(SendBirdMessagingChannel *channel) {
UIStoryboard *storyboard = [self storyboard];
MessagingViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"MessagingViewController"];
[vc setMessagingChannel:channel];
[vc setDelegate:self];
[self presentViewController:vc animated:YES completion:nil];
} messagingUpdatedBlock:^(SendBirdMessagingChannel *channel) {
} messagingEndedBlock:^(SendBirdMessagingChannel *channel) {
} allMessagingEndedBlock:^{
} messagingHiddenBlock:^(SendBirdMessagingChannel *channel) {
} allMessagingHiddenBlock:^{
} readReceivedBlock:^(SendBirdReadStatus *status) {
} typeStartReceivedBlock:^(SendBirdTypeStatus *status) {
} typeEndReceivedBlock:^(SendBirdTypeStatus *status) {
} allDataReceivedBlock:^(NSUInteger sendBirdDataType, int count) {
} messageDeliveryBlock:^(BOOL send, NSString *message, NSString *data, NSString *messageId) {
}];
if (tf) {
[[SendBird queryMessageListInChannel:[currentChannel url]] prevWithMessageTs:LLONG_MAX andLimit:50 resultBlock:^(NSMutableArray *queryResult) {
for (SendBirdMessage *message in queryResult) {
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
}
[self scrollToBottomWithReloading:YES animated:NO];
scrollLocked = NO;
[SendBird connectWithMessageTs:LLONG_MAX];
} endBlock:^(NSError *error) {
}];
}
else {
[SendBird connect];
}
}
These lines of code get a view controller for messaging from the storyboard and the view controller is set with the channel returned from the block. As a result, the view controller is initialized.
Implement Messaging
MessagingViewController.m is invoked by messagingStartedBlock: in OpenChatChattingViewController.m. Open MessagingViewController.m in Xcode to implement messaging features including a message transfer, a typing indicator and an unread message count. When the current channel is updated registerNotificationHandlerMessagingChannelUpdatedBlock: will be invoked, then you have to update the infomation and message's read status of the channel.
Modify viewDidLoad method to initialze the messaging system.
- (void)viewDidLoad {
// ...
[SendBird loginWithUserId:[SendBird deviceUniqueID] andUserName:[MyUtils getUserName] andUserImageUrl:[MyUtils getUserProfileImage] andAccessToken:@""];
[SendBird registerNotificationHandlerMessagingChannelUpdatedBlock:^(SendBirdMessagingChannel *channel) {
if ([SendBird getCurrentChannel] != nil && [[SendBird getCurrentChannel] channelId] == [channel getId]) {
[self updateMessagingChannel:channel];
}
}
mentionUpdatedBlock:^(SendBirdMention *mention) {
}];
[SendBird setEventHandlerConnectBlock:^(SendBirdChannel *channel) {
[SendBird markAsRead];
} errorBlock:^(NSInteger code) {
} channelLeftBlock:^(SendBirdChannel *channel) {
} messageReceivedBlock:^(SendBirdMessage *message) {
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
[self scrollToBottomWithReloading:YES animated:NO];
[SendBird markAsRead];
} systemMessageReceivedBlock:^(SendBirdSystemMessage *message) {
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
[self scrollToBottomWithReloading:YES animated:NO];
[SendBird markAsRead];
} broadcastMessageReceivedBlock:^(SendBirdBroadcastMessage *message) {
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
[self scrollToBottomWithReloading:YES animated:NO];
[SendBird markAsRead];
} fileReceivedBlock:^(SendBirdFileLink *fileLink) {
if (lastMessageTimestamp < [fileLink getMessageTimestamp]) {
lastMessageTimestamp = [fileLink getMessageTimestamp];
}
if ([fileLink isPast]) {
[messages insertObject:fileLink atIndex:0];
}
else {
[messages addObject:fileLink];
}
[self scrollToBottomWithReloading:YES animated:NO];
[SendBird markAsRead];
} messagingStartedBlock:^(SendBirdMessagingChannel *channel) {
currentChannel = channel;
[self updateMessagingChannel:channel];
[[SendBird queryMessageListInChannel:[currentChannel getUrl]] prevWithMessageTs:LLONG_MAX andLimit:50 resultBlock:^(NSMutableArray *queryResult) {
for (SendBirdMessage *message in queryResult) {
if ([message isPast]) {
[messages insertObject:message atIndex:0];
}
else {
[messages addObject:message];
}
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
}
[self scrollToBottomWithReloading:YES animated:NO];
[SendBird joinChannel:[currentChannel getUrl]];
scrollLocked = NO;
[SendBird connectWithMessageTs:LLONG_MAX];
} endBlock:^(NSError *error) {
}];
} messagingUpdatedBlock:^(SendBirdMessagingChannel *channel) {
currentChannel = channel;
[self updateMessagingChannel:channel];
} messagingEndedBlock:^(SendBirdMessagingChannel *channel) {
} allMessagingEndedBlock:^{
} messagingHiddenBlock:^(SendBirdMessagingChannel *channel) {
} allMessagingHiddenBlock:^{
} readReceivedBlock:^(SendBirdReadStatus *status) {
[self setReadStatus:[[status user] guestId] andTimestamp:[status timestamp]];
[self.messagingTableView reloadData];
} typeStartReceivedBlock:^(SendBirdTypeStatus *status) {
[self setTypeStatus:[[status user] guestId] andTimestamp:[status timestamp]];
[self showTyping];
} typeEndReceivedBlock:^(SendBirdTypeStatus *status) {
[self setTypeStatus:[[status user] guestId] andTimestamp:0];
[self showTyping];
} allDataReceivedBlock:^(NSUInteger sendBirdDataType, int count) {
} messageDeliveryBlock:^(BOOL send, NSString *message, NSString *data, NSString *messageId) {
}];
[SendBird joinMessagingWithChannelUrl:[currentChannel getUrl]];
}
We must manage the timestamp of the last and the first message. The timestamp of the last message will be used for loading next messages and the timestamp of the first will be used for loading the previous messages.
In the above code we used LLONG_MAX value for prevWithMessageTs: which means that the latest messages can be fetched from SendBird server. The messaging channel, however, can receive new message while it is fetching other messages from the server. So we invoke [SendBird connectWithMessageTs:LLONG_MAX] in resultBlock:. Any new message will be passed to messageReceivedBlock: of [SendBird setEventHandlerConnectBlock:...] like as a real-time message.
Load Previous Messages
Modify loadPreviosMessage method to fetch previous messages.
- (void) loadPreviousMessages {
if (isLoadingMessage) {
return;
}
isLoadingMessage = YES;
[self.prevMessageLoadingIndicator setHidden:NO];
[self.prevMessageLoadingIndicator startAnimating];
[[SendBird queryMessageListInChannel:[currentChannel getUrl]] prevWithMessageTs:firstMessageTimestamp andLimit:50 resultBlock:^(NSMutableArray *queryResult) {
NSMutableArray *newMessages = [[NSMutableArray alloc] init];
for (SendBirdMessage *message in queryResult) {
if ([message isPast]) {
[newMessages insertObject:message atIndex:0];
}
else {
[newMessages addObject:message];
}
if (lastMessageTimestamp < [message getMessageTimestamp]) {
lastMessageTimestamp = [message getMessageTimestamp];
}
if (firstMessageTimestamp > [message getMessageTimestamp]) {
firstMessageTimestamp = [message getMessageTimestamp];
}
}
NSUInteger newMsgCount = [newMessages count];
if (newMsgCount > 0) {
[messages insertObjects:newMessages atIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, newMsgCount)]];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.messagingTableView reloadData];
if ([newMessages count] > 0) {
[self.messagingTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:([newMessages count] - 1) inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
}
isLoadingMessage = NO;
[self.prevMessageLoadingIndicator setHidden:YES];
[self.prevMessageLoadingIndicator stopAnimating];
});
}
else {
isLoadingMessage = NO;
[self.prevMessageLoadingIndicator setHidden:YES];
[self.prevMessageLoadingIndicator stopAnimating];
}
} endBlock:^(NSError *error) {
isLoadingMessage = NO;
[self.prevMessageLoadingIndicator setHidden:YES];
[self.prevMessageLoadingIndicator stopAnimating];
}];
}
Send a Message to a Channel
To send a message, modify sendMessage: method. This method is invoked by clicking the Send button or pressing the return key. SendBird sendMessage: method sends message in real-time.
- (void) sendMessage
{
NSString *message = [self.messageTextField text];
if ([message length] > 0) {
[self.messageTextField setText:@""];
[SendBird sendMessage:message];
[SendBird typeEnd];
}
scrollLocked = NO;
}
If you click the File button, clickSendFileButton: method will be invoked to open UIImagePickerController. Since UIImagePickerController is used to select an image to send, modify the following method - SendBird uploadFile:type:hasSizeOfFile:withCustomField:uploadBlock: which uploads imageFileData to SendBird server. This method returns SendBirdFileInfo object which can be sent through SendBird SendBird sendFile:.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
__block NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
__block UIImage *originalImage, *editedImage, *imageToUse;
__block NSURL *imagePath;
__block NSString *imageName;
[picker dismissViewControllerAnimated:YES completion:^{
if (CFStringCompare ((CFStringRef) mediaType, kUTTypeImage, 0) == kCFCompareEqualTo) {
editedImage = (UIImage *) [info objectForKey:
UIImagePickerControllerEditedImage];
originalImage = (UIImage *) [info objectForKey:
UIImagePickerControllerOriginalImage];
if (originalImage) {
imageToUse = originalImage;
} else {
imageToUse = editedImage;
}
NSData *imageFileData = UIImagePNGRepresentation(imageToUse);
imagePath = [info objectForKey:@"UIImagePickerControllerReferenceURL"];
imageName = [imagePath lastPathComponent];
[SendBird uploadFile:imageFileData type:@"image/jpg" hasSizeOfFile:[imageFileData length] withCustomField:@"" uploadBlock:^(SendBirdFileInfo *fileInfo, NSError *error) {
openImagePicker = NO;
[SendBird sendFile:fileInfo];
}];
}
}];
}
Implement Typing Indicator
Send Typing Status
The Messaging supports a typing indicator. The typing indicator shows who is typing and how many people are typing now.
When a message is being entered in UITextField, send a command to notify typing status. When UITextField is empty, send a command to notify the end of typing.
- (void) textFieldDidChange:(UITextView *)textView
{
if ([[textView text] length] > 0) {
[SendBird typeStart];
}
else {
[SendBird typeEnd];
}
}
Receive Typing Status
You can receive the typing status of other users in the same channel in callback blocks. [SendBird setEventHandlerConnectBlock:... includes these callbacks.
//...
} typeStartReceivedBlock:^(SendBirdTypeStatus *status) {
[self setTypeStatus:[[status user] guestId] andTimestamp:[status timestamp]];
[self showTyping];
} typeEndReceivedBlock:^(SendBirdTypeStatus *status) {
[self setTypeStatus:[[status user] guestId] andTimestamp:0];
[self showTyping];
}
//...
We always have to consider the network issue. The command that notifies the end of typing can get lost, so you need to implement a timer to handle this exception. The timer will remove the indicator after 10 seconds even if the command that notifies the end of typing is not received.
- (void)startTimer
{
if (typingIndicatorTimer != nil) {
[typingIndicatorTimer invalidate];
}
typingIndicatorTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(clearTypingIndicator:) userInfo:nil repeats:NO];
}
- (void)clearTypingIndicator:(NSTimer *)timer
{
[self hideTyping];
}
- (void) showTyping
{
if ([typeStatus count] == 0) {
[self hideTyping];
}
else {
[self.typingIndicatorView setHidden:NO];
[self.typeStatusLabel setHidden:NO];
self.typingIndicatorHeight.constant = 48;
[self.view updateConstraints];
[self scrollToBottomWithReloading:NO animated:NO];
[self.typeStatusLabel setText:[MyUtils generateTypingStatus:typeStatus]];
}
[self startTimer];
}
The typing indicator is at the bottom of the message table view.
Manage Unread Count on Each Message
Send Mark-as-Read
In order to display the number of users who did not read a certain message, you have to send the mark-as-read command whenever you receive message.
[SendBird setEventHandlerConnectBlock:^(SendBirdChannel *channel) {
[SendBird markAsRead];
} errorBlock:^(NSInteger code) {
} channelLeftBlock:^(SendBirdChannel *channel) {
} messageReceivedBlock:^(SendBirdMessage *message) {
// ...
[SendBird markAsRead];
} systemMessageReceivedBlock:^(SendBirdSystemMessage *message) {
// ...
[SendBird markAsRead];
} broadcastMessageReceivedBlock:^(SendBirdBroadcastMessage *message) {
// ...
[SendBird markAsRead];
} fileReceivedBlock:^(SendBirdFileLink *fileLink) {
// ...
[SendBird markAsRead];
} messagingStartedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} messagingUpdatedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} messagingEndedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} allMessagingEndedBlock:^{
// ...
} messagingHiddenBlock:^(SendBirdMessagingChannel *channel) {
// ...
} allMessagingHiddenBlock:^{
// ...
} readReceivedBlock:^(SendBirdReadStatus *status) {
// ...
} typeStartReceivedBlock:^(SendBirdTypeStatus *status) {
// ...
} typeEndReceivedBlock:^(SendBirdTypeStatus *status) {
// ...
} allDataReceivedBlock:^(NSUInteger sendBirdDataType, int count) {
// ...
} messageDeliveryBlock:^(BOOL send, NSString *message, NSString *data, NSString *messageId) {
// ...
}];
Display Unread Count
When other users send you a mark-as-read command, it is passed to readReceivedBlock: callback in [SendBird setEventHandlerConnectBlock:...].
[SendBird setEventHandlerConnectBlock:^(SendBirdChannel *channel) {
// ...
} errorBlock:^(NSInteger code) {
// ...
} channelLeftBlock:^(SendBirdChannel *channel) {
// ...
} messageReceivedBlock:^(SendBirdMessage *message) {
// ...
} systemMessageReceivedBlock:^(SendBirdSystemMessage *message) {
// ...
} broadcastMessageReceivedBlock:^(SendBirdBroadcastMessage *message) {
// ...
} fileReceivedBlock:^(SendBirdFileLink *fileLink) {
// ...
} messagingStartedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} messagingUpdatedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} messagingEndedBlock:^(SendBirdMessagingChannel *channel) {
// ...
} allMessagingEndedBlock:^{
// ...
} messagingHiddenBlock:^(SendBirdMessagingChannel *channel) {
// ...
} allMessagingHiddenBlock:^{
// ...
} readReceivedBlock:^(SendBirdReadStatus *status) {
[self setReadStatus:[[status user] guestId] andTimestamp:[status timestamp]];
[self.messagingTableView reloadData];
} typeStartReceivedBlock:^(SendBirdTypeStatus *status) {
// ...
} typeEndReceivedBlock:^(SendBirdTypeStatus *status) {
// ...
} allDataReceivedBlock:^(NSUInteger sendBirdDataType, int count) {
// ...
} messageDeliveryBlock:^(BOOL send, NSString *message, NSString *data, NSString *messageId) {
// ...
}];
If you received a mark-as-read command, update the read status of the current channel and reload the message table view.
- (void) setReadStatus:(NSString *)userId andTimestamp:(long long)ts
{
if (readStatus == nil) {
readStatus = [[NSMutableDictionary alloc] init];
}
if ([readStatus objectForKey:userId] == nil) {
[readStatus setObject:[NSNumber numberWithLongLong:ts] forKey:userId];
}
else {
long long oldTs = [[readStatus objectForKey:userId] longLongValue];
if (oldTs < ts) {
[readStatus setObject:[NSNumber numberWithLongLong:ts] forKey:userId];
}
}
}
When the current channel is updated by registerNotificationHandlerMessagingChannelUpdatedBlock:mentionUpdatedBlock:, you have to update the read status of the channel. The following method is invoked in registerNotificationHandlerMessagingChannelUpdatedBlock: callback.
- (void) updateMessagingChannel:(SendBirdMessagingChannel *)channel
{
[self.navigationBarTitle setTitle:[MyUtils generateMessagingTitle:currentChannel]];
NSMutableDictionary *newReadStatus = [[NSMutableDictionary alloc] init];
for (SendBirdMemberInMessagingChannel *member in [channel members]) {
NSNumber *currentStatus = [readStatus objectForKey:[member guestId]];
if (currentStatus == nil) {
currentStatus = [NSNumber numberWithLongLong:0];
}
[newReadStatus setObject:[NSNumber numberWithLongLong:MAX([currentStatus longLongValue], [channel getLastReadMillis:[member guestId]])] forKey:[member guestId]];
}
if (readStatus == nil) {
readStatus = [[NSMutableDictionary alloc] init];
}
[readStatus removeAllObjects];
for (NSString *key in newReadStatus) {
id value = [newReadStatus objectForKey:key];
[readStatus setObject:value forKey:key];
}
[self.messagingTableView reloadData];
}
If you implement the read status for all messages, you can see the unread count for each of them.
Implement Messaging List
Each user has a list of messaging channels which it joined. We will display the channel list on Messaging Tab.
Open MessagingChannelListViewController.m in Xcode.
The messaging channel list will be updated whenever each channel is updated. Each channel item in the list includes a title which consists of its members, the member count, the last message in the channel, the date of the last message and the unread message count.
startSendBird method is invoked when the messaging tab is selected and prepareCloseMessagingViewController of MessagingViewControllerDelegate and prepareCloseMessagingInviteSelectChannelViewController of MessagingInviteSelectChannelViewControllerDelegate are invoked. registerNotificationHandlerMessagingChannelUpdatedBlock callback returns an updated messaging channel, which should be used to update the corresponding channel.
- (void) startSendBird
{
[SendBird loginWithUserId:[SendBird deviceUniqueID] andUserName:[MyUtils getUserName] andUserImageUrl:[MyUtils getUserProfileImage] andAccessToken:@""];
[SendBird registerNotificationHandlerMessagingChannelUpdatedBlock:^(SendBirdMessagingChannel *channel) {
for (SendBirdMessagingChannel *oldChannel in channelArray) {
if ([oldChannel getId] == [channel getId]) {
[channelArray removeObject:oldChannel];
break;
}
}
[channelArray insertObject:channel atIndex:0];
[self.messagingChannelListTableView reloadData];
}
mentionUpdatedBlock:^(SendBirdMention *mention) {
}];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
messagingChannelListQuery = [SendBird queryMessagingChannelList];
[messagingChannelListQuery setLimit:15];
if ([messagingChannelListQuery hasNext]) {
[messagingChannelListQuery nextWithResultBlock:^(NSMutableArray *queryResult) {
[channelArray removeAllObjects];
[channelArray addObjectsFromArray:queryResult];
[self.messagingChannelListTableView reloadData];
} endBlock:^(NSInteger code) {
}];
}
[SendBird joinChannel:@""];
[SendBird connect];
});
}
When the channel is clicked MessagingViewController has to be open.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
SendBirdMessagingChannel *channel = (SendBirdMessagingChannel *)[channelArray objectAtIndex:[indexPath row]];
UIStoryboard *storyboard = [self storyboard];
MessagingViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"MessagingViewController"];
[vc setMessagingChannel:channel];
[vc setDelegate:self];
[self presentViewController:vc animated:YES completion:nil];
}
Load Next Channel List
To see the next channel list, implement loadNextChannelList method. This method will be invoked when the `messagingChannelListTableView draws the last cell.
- (void)loadNextChannelList
{
if (isLoadingChannel) {
return;
}
isLoadingChannel = YES;
if ([messagingChannelListQuery hasNext]) {
[messagingChannelListQuery nextWithResultBlock:^(NSMutableArray *queryResult) {
[channelArray addObjectsFromArray:queryResult];
[self.messagingChannelListTableView reloadData];
isLoadingChannel = NO;
} endBlock:^(NSInteger code) {
isLoadingChannel = NO;
}];
}
}
