IOS learning 43 instant messaging XMPP (2), iosxmpp

IOS learning 43 instant messaging XMPP (2), iosxmpp

This article describes how to connect XMPP (2) with Instant Messaging (XMPP) (1)

1. Friends List 1> initialize friends roster

// Obtain the singleton object XMPPRosterCoreDataStorage * rosterStorage = [XMPPRosterCoreDataStorage sharedInstance] for managing friends; // initialize self for the roster attribute. xmppRoster = [[XMPPRoster alloc] initWithRosterStorage: rosterStorage dispatchQueue: dispatch_get_global_queue (Friends, 0)]; // activate [self. xmppRoster activate: self. xmppStream]; // sets the roster proxy [self. xmppRoster addDelegate: self delegateQueue: dispatch_get_main_queue ()];

2> XMPPRoster proxy method

Code:

# Pragma mark-XMPPRosterDelegate proxy method // start to get friends-(void) xmppRosterDidBeginPopulating :( XMPPRoster *) sender {NSLog (@ "start to get friends ");} /// end obtaining friends-(void) xmppRosterDidEndPopulating :( XMPPRoster *) sender {// the current page is applicable to displaying the friends list, therefore, you need to refresh the page in the proxy method obtained by friends, and then display the data // refresh the page [self. tableView reloadData];} // receive friend information // This proxy method is executed multiple times. Each time a friend is added, the corresponding friend information must be fed back-(void) xmppRoster :( XMPPRoster *) sender didReceiveRosterItem :( DDXMLElement *) item {/* both mutual friend none mutual friend to I have already added peer to friend, however, the other party has not accepted the "from" request. The other party has added me as a friend, however, I have not yet accepted the remove deleted friend * // describe the relationship between myself and the other party NSString * description = [[item attributeForName: @ "subcategory"] stringValue]; NSLog (@ "description = % @", description); if ([description isrequired tostring: @ "to"] | [description isrequired tostring: @ "none"] | [description isinclutostring: @ "both"] | [description isinclutostring: @ "from"]) {// Add a friend // obtain the JID NSString * friendJID = [[item attributeForName: @ "jid"] stringValue]; XMPPJID * jid = [XMPPJID jidWithString: friendJID]; // if this user exists in the array, the operation if ([self. allRosterArray containsObject: jid]) {return;} // Add friends to the array [self. allRosterArray addObject: jid]; // Add this data NSIndexPath * indexPath = [NSIndexPath indexPathForItem: self. allRosterArray. count-1 inSection: 0]; [self. tableView insertRowsAtIndexPaths: @ [indexPath] withRowAnimation: UITableViewRowAnimationRight];} // receives a friend's listening request (add friend request), whether to agree-(void) xmppRoster :( XMPPRoster *) sender didReceivePresenceSubscriptionRequest :( XMPPPresence *) presence {self. fromJID = presence. from; // related reminder boxes are required to determine whether to accept UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @ "friend request" message: @ "accept friend request" preferredStyle: accept]; _ weak typeof (self) weakSelf = self; UIAlertAction * acceptAction = [UIAlertAction actionWithTitle: @ "accept" style: UIAlertActionStyleDefault handler: ^ (UIAlertAction * _ Nonnull action) {// accept related friends in the Roster [[XMPPManager shareXMPPManager]. xmppRoster acceptPresenceSubscriptionRequestFrom: weakSelf. fromJID andAddToRoster: YES];}]; UIAlertAction * rejectAction = [UIAlertAction actionWithTitle: @ "reject" style: UIAlertActionStyleDefault handler: ^ (UIAlertAction * _ Nonnull action) {[XMPPManager shareXMPPManager]. xmppRoster rejectPresenceSubscriptionRequestFrom: weakSelf. fromJID] ;}]; [alertController addAction: acceptAction]; [alertController addAction: rejectAction]; [self presentViewController: alertController animated: YES completion: nil];}

3> methods required to add friends

Code:

 

-(Void) addFriend {UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @ "add friend" message: @ "enter the name of your friend" preferredStyle: UIAlertControllerStyleAlert] _ weak typeof (self) mySlef = self; [alertController addTextFieldWithConfigurationHandler: ^ (UITextField * _ Nonnull textField) {mySlef. textField = textField;}]; UIAlertAction * cancelAction = [UIAlertAction actionWithTitle: @ "cancel" Style: UIAlertActionStyleCancel handler: ^ (UIAlertAction * _ Nonnull action) {NSLog (@ "cancel friend deletion! ") ;}]; UIAlertAction * ensureAction = [UIAlertAction actionWithTitle: @" OK "style: UIAlertActionStyleDefault handler: ^ (UIAlertAction * _ Nonnull action) {// use JID to record XMPPJID * friendJID = [XMPPJID jidWithString: [NSString stringWithFormat: @ "% @", mySlef. textField. text, kDomin]; // listens for friend actions [mySlef. xmppRoster subscribePresenceToUser: friendJID]; // Add a friend [mySlef. xmppRoster addUser: friendJID withNickname: mySlef. textField. text] ;}]; [alertController addAction: ensureAction]; [alertController addAction: cancelAction]; [[self getCurrentVC] presentViewController: alertController animated: YES completion: nil];}

4> Delete friends

Code:

# Pragma mark-delete friend-(void) removeFriendWithName :( NSString *) name {// use JID to record XMPPJID * friendJID = [XMPPJID jidWithUser: name domain: kDomin resource: kResource]; // stop listening to friends [self. xmppRoster unsubscribePresenceFromUser: friendJID]; // delete a friend [self. xmppRoster removeUser: friendJID];}

2. Chat 1> chat rules:

• Obtains chat records from the server and determines the message type based on data attributes.

• Send message

• Receive messages

2> initialize message Archiving

// Obtain the storage object XMPPMessageArchivingCoreDataStorage * storage = [XMPPMessageArchivingCoreDataStorage sharedInstance]; // message manager initialization self. messageArchiving = [[XMPPMessageArchiving alloc] initWithMessageArchivingStorage: storage dispatchQueue: dispatch_get_main_queue ()]; // activate the channel [self. messageArchiving activate: self. xmppStream]; // sets the proxy [self. messageArchiving addDelegate: self delegateQueue: dispatch_get_main_queue ()]; // sets the message management context self. context = [storage mainThreadManagedObjectContext];

3> get chat records

Obtain chat records using CoreData

• CREATE request

• Create object description, Object Name: XMPPMessageArchiving_Message_CoreDataObject

• Create a predicate query condition. condition: streamBareJidStr = My Jid AND bareJidStr = friend Jid

• Create a sorting object. The sorting condition is timestamp.

• Execute request

Code:

# Pragma mark-Display message-(void) showMessage {// obtain the management context NSManagedObjectContext * contxt = [XMPPManager shareXMPPManager]. context; // initialize the request object NSFetchRequest * request = [NSFetchRequest new]; // obtain the entity NSEntityDescription * entity = [NSEntityDescription entityForName: @ "entity" inManagedObjectContext: contxt]; // set the object of the query request [request setEntity: entity]; // set the predicate query NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "streamBareJidStr ==%@ AND bareJidStr ==%@", [XMPPManager shareXMPPManager]. xmppStream. myJID. bare, self. chatToJID. bare]; [request setPredicate: predicate]; // sort by time. NSSortDescriptor * sort = [[delealloc] initWithKey: @ "timestamp" ascending: YES]; [request setSortDescriptors: @ [sort]; // execute related operations NSArray * resultArray = [contxt executeFetchRequest: request error: nil]; // first clear the message array [self. allMessageArray removeAllObjects]; // Add the context execution result array [self. allMessageArray addObjectsFromArray: resultArray]; // refresh the UI [self. tableView reloadData]; // The current chat record jumps to the last line if (self. allMessageArray. count> 0) {NSIndexPath * indexPath = [NSIndexPath indexPathForRow: self. allMessageArray. count-1 inSection: 0]; // jump to the last line [self. tableView selectRowAtIndexPath: indexPath animated: YES scrollPosition: UITableViewScrollPositionBottom];}

4> send messages

# Pragma mark-sending and clicking method-(void) sendMessageAction {// set the message body XMPPMessage * message = [XMPPMessage messageWithType: @ "chat" to: self. chatToJID]; // The sent content, which is generally obtained from the input box. Here we write a fixed value [message addBody: @ "yes"]; // send messages through the channel [[XMPPManager shareXMPPManager]. xmppStream sendElement: message];}

5> receive/Send message callback

Code:

# Pragma mark message sent successfully-(void) xmppStream :( XMPPStream *) sender didSendMessage :( XMPPMessage *) message {// re-display related message [self showMessage];} # pragma mark received the message successfully-(void) xmppStream :( XMPPStream *) sender didReceiveMessage :( XMPPMessage *) message {[self showMessage] ;}# pragma mark failed to send the message-(void) xmppStream :( XMPPStream *) sender didFailToSendMessage :( XMPPMessage *) message error :( NSError *) error {NSLog (@ "message sending failed ");}

6> message bubbles

Code:

// Rewrite the message method and display the chat record-(void) setMessage :( NSString *) message {if (_ message! = Message) {_ message = message; self. contentLabel. text = _ message; // self. contentLabel. numberOfLines = 0; [self. contentLabel sizeToFit]; CGRect rect = self. frame; if (self. isOut) {// self. backgroundImageView. image = [[UIImage imageNamed: @ "chat_to"] stretchableImageWithLeftCapWidth: 45 topCapHeight: 40]; self. backgroundImageView. frame = CGRectMake (rect. size. width-self. contentLabel. frame. size. width-50-20, 10, self. contentLabel. frame. size. width + 20, rect. size. height-20);} else {// received self. backgroundImageView. image = [[UIImage imageNamed: @ "chat_from"] stretchableImageWithLeftCapWidth: 45 topCapHeight: 40]; self. backgroundImageView. frame = CGRectMake (50, 10, self. contentLabel. frame. size. width + 40, rect. size. height-20);} // because contentLabel is adaptive to the text size, you do not need to set the width and height, but you need to set the position self. contentLabel. center = CGPointMake (self. backgroundImageView. frame. size. width/2.0, self. backgroundImageView. frame. size. height/2.0 );}}

 

The above code is part of the exercise code! Complete exercise code github: https://github.com/AlonerOwl/UISenior11_-_1

Because it is just a practice code, the interface and some functions are not optimized and it looks relatively low. If you need it, please optimize it yourself.

Code: