1. <</SPAN>message type="chat" from="kang@server.com" to="test@server.com">
2. <</SPAN>body>helloWord</</SPAN>body>
3. </</SPAN>message>

介绍完了服务器，这篇我们就要介绍重点了，写我们自己的IOS客户端程序

先看一下我们完成的效果图

http://my.csdn.net/uploads/201207/13/1342164555_1035.png

http://my.csdn.net/uploads/201207/13/1342164590_1834.png

首先下载xmppframework这个框架,下载

http://my.csdn.net/uploads/201207/12/1342074297_5170.png

点ZIP下载

接下来，用Xcode新建一个工程

将以下这些文件拖入新建工程中

http://my.csdn.net/uploads/201207/12/1342077119_4696.png

http://my.csdn.net/uploads/201207/12/1342074830_1517.png

加入framework

http://my.csdn.net/uploads/201207/12/1342077141_6924.png

并设置

1. #import
2. @interface KKViewController : UIViewController
3. @property (strong, nonatomic) IBOutlet UITableView *tView;
4. - (IBAction)Account:(id)sender;
5. @end

1. #import "KKViewController.h"
2. @interface KKViewController (){
3. //在线用户
4. NSMutableArray *onlineUsers;
5. }
6. @end
7. @implementation KKViewController
8. @synthesize tView;
9. - (void)viewDidLoad
10. {
11. [super viewDidLoad];
12. self.tView.delegate = self;
13. self.tView.dataSource = self;
14. onlineUsers = [NSMutableArray array];
15. // Do any additional setup after loading the view, typically from a nib.
16. }
17. - (void)viewDidUnload
18. {
19. [self setTView:nil];
20. [super viewDidUnload];
21. // Release any retained subviews of the main view.
22. }
23. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
24. {
25. return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
26. }
27. - (IBAction)Account:(id)sender {
28. }
29. #pragma mark UITableViewDataSource
30. -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
31. return [onlineUsers count];
32. }
33. -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
34. static NSString *identifier = @"userCell";
35. UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
36. if (cell == nil) {
37. cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
38. }
39. return cell;
40. }
41. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
42. return 1;
43. }
44. #pragma mark UITableViewDelegate
45. -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
46. }
47. @end

1. - (IBAction)LoginButton:(id)sender {
2. if ([self validateWithUser:userTextField.text andPass:passTextField.text andServer:serverTextField.text]) {
3. NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
4. [defaults setObject:self.userTextField.text forKey:USERID];
5. [defaults setObject:self.passTextField.text forKey:PASS];
6. [defaults setObject:self.serverTextField.text forKey:SERVER];
7. //保存
8. [defaults synchronize];
9. [self dismissModalViewControllerAnimated:YES];
10. }else {
11. UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"请输入用户名，密码和服务器" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
12. [alert show];
13. }
14. }
15. - (IBAction)closeButton:(id)sender {
16. [self dismissModalViewControllerAnimated:YES];
17. }
18. -(BOOL)validateWithUser:(NSString *)userText andPass:(NSString *)passText andServer:(NSString *)serverText{
19. if (userText.length > 0 && passText.length > 0 && serverText.length > 0) {
20. return YES;
21. }
22. return NO;
23. }

1. -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
2. return 1;
3. }
4. -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
5. return [messages count];
6. }
7. -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
8. static NSString *identifier = @"msgCell";
9. UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
10. if (cell == nil) {
11. cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
12. }
13. NSMutableDictionary *dict = [messages objectAtIndex:indexPath.row];
14. cell.textLabel.text = [dict objectForKey:@"msg"];
15. cell.detailTextLabel.text = [dict objectForKey:@"sender"];
16. cell.accessoryType = UITableViewCellAccessoryNone;
17. return cell;
18. }

接上一章的，这一章我们着重介绍XMPP

为了方便程序调用，我们把XMPP的一些主要方法写在AppDelegate中

http://my.csdn.net/uploads/201207/13/1342165427_8599.png

在AppDelegate.m下这几个方法为：

-(void)setupStream{
    
    //初始化XMPPStream
    xmppStream = [[XMPPStream alloc] init];
    [xmppStream addDelegate:self delegateQueue:dispatch_get_current_queue()];
    
}

-(void)goOnline{
    
    //发送在线状态
    XMPPPresence *presence = [XMPPPresence presence];
    [[self xmppStream] sendElement:presence];
    
}

-(void)goOffline{
    
    //发送下线状态
    XMPPPresence *presence = [XMPPPresence presenceWithType:@"unavailable"];
    [[self xmppStream] sendElement:presence];
    
}

-(BOOL)connect{
    
    [self setupStream];
    
    //从本地取得用户名，密码和服务器地址
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    
    NSString *userId = [defaults stringForKey:USERID];
    NSString *pass = [defaults stringForKey:PASS];
    NSString *server = [defaults stringForKey:SERVER];
    
    if (![xmppStream isDisconnected]) {
        return YES;
    }
    
    if (userId == nil || pass == nil) {
        return NO;
    }
    
    //设置用户
    [xmppStream setMyJID:[XMPPJID jidWithString:userId]];
    //设置服务器
    [xmppStream setHostName:server];
    //密码
    password = pass;
    
    //连接服务器
    NSError *error = nil;
    if (![xmppStream connect:&error]) {
        NSLog(@"cant connect %@", server);
        return NO;
    }
    
    return YES;

}

-(void)disconnect{
    
    [self goOffline];
    [xmppStream disconnect];
    
}

//连接服务器
- (void)xmppStreamDidConnect:(XMPPStream *)sender{
    
    isOpen = YES;
    NSError *error = nil;
    //验证密码
    [[self xmppStream] authenticateWithPassword:password error:&error];
    
}

//验证通过
- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender{
    
    [self goOnline];
}

//收到消息
- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{
    
//    NSLog(@"message = %@", message);
    
    NSString *msg = [[message elementForName:@"body"] stringValue];
    NSString *from = [[message attributeForName:@"from"] stringValue];
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:msg forKey:@"msg"];
    [dict setObject:from forKey:@"sender"];
    
    //消息委托(这个后面讲)
    [messageDelegate newMessageReceived:dict];
    
}

//收到好友状态
- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence{
    
//    NSLog(@"presence = %@", presence);
    
    //取得好友状态
    NSString *presenceType = [presence type]; //online/offline
    //当前用户
    NSString *userId = [[sender myJID] user];
    //在线用户
    NSString *presenceFromUser = [[presence from] user];
    
    if (![presenceFromUser isEqualToString:userId]) {
        
        //在线状态
        if ([presenceType isEqualToString:@"available"]) {
            
            //用户列表委托(后面讲)
            [chatDelegate newBuddyOnline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"nqc1338a"]];
            
        }else if ([presenceType isEqualToString:@"unavailable"]) {
            //用户列表委托(后面讲)
            [chatDelegate buddyWentOffline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"nqc1338a"]];
        }
        
    }

}

http://my.csdn.net/uploads/201207/13/1342166381_8738.png

http://my.csdn.net/uploads/201207/13/1342166396_5139.png

定义完两个委托，我们就要在不同的Controller中实现这两个委托了

在好友Controller中实现并写入如下方法

//取得当前程序的委托
-(KKAppDelegate *)appDelegate{
    
    return (KKAppDelegate *)[[UIApplication sharedApplication] delegate];
    
}

//取得当前的XMPPStream
-(XMPPStream *)xmppStream{
    
    return [[self appDelegate] xmppStream];
}

//在线好友
-(void)newBuddyOnline:(NSString *)buddyName{
    
    if (![onlineUsers containsObject:buddyName]) {
        [onlineUsers addObject:buddyName];
        [self.tView reloadData];
    }
    
}

//好友下线
-(void)buddyWentOffline:(NSString *)buddyName{
    
    [onlineUsers removeObject:buddyName];
    [self.tView reloadData];
    
}

//设定在线用户委托
    KKAppDelegate *del = [self appDelegate];
    del.chatDelegate = self;

在viewWillAppear中加入

    [super viewWillAppear:animated];
    
    NSString *login = [[NSUserDefaults standardUserDefaults] objectForKey:@"userId"];
    
    if (login) {
        
        if ([[self appDelegate] connect]) {
            NSLog(@"show buddy list");
            
        }
        
    }else {
        
        //设定用户
        [self Account:self];
        
    }

这里最重要的就是connect了，这一句话就是登录了，成功的话，页面就会显示好友列表了。

#pragma mark UITableViewDelegate
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    
    //start a Chat
    chatUserName = (NSString *)[onlineUsers objectAtIndex:indexPath.row];
    
    [self performSegueWithIdentifier:@"chat" sender:self];
    
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    
    if ([segue.identifier isEqualToString:@"chat"]) {
        KKChatController *chatController = segue.destinationViewController;
        chatController.chatWithUser = chatUserName;
    }
}

将当前好友名称发送给聊天页面

下面是聊天Controller了

在KKChatController.h中加入

NSMutableArray *messages;

接下来就是每一条消息的显示了

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    static NSString *identifier = @"msgCell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
    }
    
    NSMutableDictionary *dict = [messages objectAtIndex:indexPath.row];
    
    cell.textLabel.text = [dict objectForKey:@"msg"];
    cell.detailTextLabel.text = [dict objectForKey:@"sender"];
    cell.accessoryType = UITableViewCellAccessoryNone;
    
    return cell;
    
}

-(KKAppDelegate *)appDelegate{
    
    return (KKAppDelegate *)[[UIApplication sharedApplication] delegate];
}

-(XMPPStream *)xmppStream{
    
    return [[self appDelegate] xmppStream];
}

KKAppDelegate *del = [self appDelegate];
del.messageDelegate = self;

#pragma mark KKMessageDelegate
-(void)newMessageReceived:(NSDictionary *)messageCotent{
    
    [messages addObject:messageCotent];
    
    [self.tView reloadData];
    
}

- (IBAction)sendButton:(id)sender {
    
    //本地输入框中的信息
    NSString *message = self.messageTextField.text;
    
    if (message.length > 0) {
        
        //XMPPFramework主要是通过KissXML来生成XML文件
        //生成

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        //日期标签
        senderAndTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 5, 300, 20)];
        //居中显示
        senderAndTimeLabel.textAlignment = UITextAlignmentCenter;
        senderAndTimeLabel.font = [UIFont systemFontOfSize:11.0];
        //文字颜色
        senderAndTimeLabel.textColor = [UIColor lightGrayColor];
        [self.contentView addSubview:senderAndTimeLabel];
        
        //背景图
        bgImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
        [self.contentView addSubview:bgImageView];
        
        //聊天信息
        messageContentView = [[UITextView alloc] init];
        messageContentView.backgroundColor = [UIColor clearColor];
        //不可编辑
        messageContentView.editable = NO;
        messageContentView.scrollEnabled = NO;
        [messageContentView sizeToFit];
        [self.contentView addSubview:messageContentView];

    }
    
    return self;
    
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    static NSString *identifier = @"msgCell";
    
    KKMessageCell *cell =(KKMessageCell *)[tableView dequeueReusableCellWithIdentifier:identifier];
    
    if (cell == nil) {
        cell = [[KKMessageCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:identifier];
    }
    
    NSMutableDictionary *dict = [messages objectAtIndex:indexPath.row];
    
    //发送者
    NSString *sender = [dict objectForKey:@"sender"];
    //消息
    NSString *message = [dict objectForKey:@"msg"];
    //时间
    NSString *time = [dict objectForKey:@"time"];
    
    CGSize textSize = {260.0 ,10000.0};
    CGSize size = [message sizeWithFont:[UIFont boldSystemFontOfSize:13] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];
    
    size.width +=(padding/2);
    
    cell.messageContentView.text = message;
    cell.accessoryType = UITableViewCellAccessoryNone;
    cell.userInteractionEnabled = NO;
    
    UIImage *bgImage = nil;
    
    //发送消息
    if ([sender isEqualToString:@"you"]) {
        //背景图
        bgImage = [[UIImage imageNamed:@"BlueBubble2.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:15];
        [cell.messageContentView setFrame:CGRectMake(padding, padding*2, size.width, size.height)];
        
        [cell.bgImageView setFrame:CGRectMake(cell.messageContentView.frame.origin.x - padding/2, cell.messageContentView.frame.origin.y - padding/2, size.width + padding, size.height + padding)];
    }else {
        
        bgImage = [[UIImage imageNamed:@"GreenBubble2.png"] stretchableImageWithLeftCapWidth:14 topCapHeight:15];
        
        [cell.messageContentView setFrame:CGRectMake(320-size.width - padding, padding*2, size.width, size.height)];
        [cell.bgImageView setFrame:CGRectMake(cell.messageContentView.frame.origin.x - padding/2, cell.messageContentView.frame.origin.y - padding/2, size.width + padding, size.height + padding)];
    }
    
    cell.bgImageView.image = bgImage;
    cell.senderAndTimeLabel.text = [NSString stringWithFormat:@"%@ %@", sender, time];

    return cell;
    
}

+(NSString *)getCurrentTime{
    
    NSDate *nowUTC = [NSDate date];
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
    
    return [dateFormatter stringFromDate:nowUTC];
    
}

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{
    
//   ......
    
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:msg forKey:@"msg"];
    [dict setObject:from forKey:@"sender"];
    //消息接收到的时间
    [dict setObject:[Statics getCurrentTime] forKey:@"time"];
    
   ......
    
}

//每一行的高度
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    NSMutableDictionary *dict  = [messages objectAtIndex:indexPath.row];
    NSString *msg = [dict objectForKey:@"msg"];
    
    CGSize textSize = {260.0 , 10000.0};
    CGSize size = [msg sizeWithFont:[UIFont boldSystemFontOfSize:13] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];
    
    size.height += padding*2;
    
    CGFloat height = size.height < 65 ? 65 : size.height;
    
    return height;
    
}

- (IBAction)sendButton:(id)sender {
    
    //本地输入框中的信息
    ......
    
    if (message.length > 0) {
        
        .....
        
        NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
        
        [dictionary setObject:message forKey:@"msg"];
        [dictionary setObject:@"you" forKey:@"sender"];
        [dictionary setObject:[Statics getCurrentTime] forKey:@"time"];

        [messages addObject:dictionary];
        
        //重新刷新tableView
        [self.tView reloadData];
        
    }
    
    
}