iOS即时通讯之简单聊天室

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#import "ViewController.h"

@interface ViewController ()<NSStreamDelegate,UITextFieldDelegate,UITableViewDataSource,UITableViewDelegate>{
    NSInputStream *_inputStream;//对应输入流
    NSOutputStream *_outputStream;//对应输出流
}
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *inputViewConstraint;
@property (weak, nonatomic) IBOutlet UITableView *tableView;

@property (nonatomic, strong) NSMutableArray *chatMsgs;//聊天消息数组

@end

@implementation ViewController

-(NSMutableArray *)chatMsgs{
    if (!_chatMsgs) {
        _chatMsgs = [NSMutableArray array];
    }

    return _chatMsgs;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    // 2.收发数据
    // 做一个聊天
    // 1.用户登录
    // 2.收发数据

    // 监听键盘
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(kbFrmWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}

-(void)kbFrmWillChange:(NSNotification *)noti{
    NSLog(@"%@",noti.userInfo);

    // 获取窗口的高度

    CGFloat windowH = [UIScreen mainScreen].bounds.size.height;

    // 键盘结束的Frm
    CGRect kbEndFrm = [noti.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
     // 获取键盘结束的y值
    CGFloat kbEndY = kbEndFrm.origin.y;

    self.inputViewConstraint.constant = windowH - kbEndY;
}

-(void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode{
    NSLog(@"%@",[NSThread currentThread]);

//    NSStreamEventOpenCompleted = 1UL << 0,//输入输出流打开完成
//    NSStreamEventHasBytesAvailable = 1UL << 1,//有字节可读
//    NSStreamEventHasSpaceAvailable = 1UL << 2,//可以发放字节
//    NSStreamEventErrorOccurred = 1UL << 3,// 连接出现错误
//    NSStreamEventEndEncountered = 1UL << 4// 连接结束
    switch (eventCode) {
        case NSStreamEventOpenCompleted:
            NSLog(@"输入输出流打开完成");
            break;
        case NSStreamEventHasBytesAvailable:
            NSLog(@"有字节可读");
            [self readData];
            break;
        case NSStreamEventHasSpaceAvailable:
            NSLog(@"可以发送字节");
            break;
        case NSStreamEventErrorOccurred:
                        NSLog(@" 连接出现错误");
            break;
        case NSStreamEventEndEncountered:
             NSLog(@"连接结束");

            // 关闭输入输出流
            [_inputStream close];
            [_outputStream close];

            // 从主运行循环移除
            [_inputStream removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
            [_outputStream removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
            break;
        default:
            break;
    }

}

- (IBAction)connectToHost:(id)sender {
    // 1.建立连接
    NSString *host = @"127.0.0.1";
    int port = 12345;

    // 定义C语言输入输出流
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)host, port, &readStream, &writeStream);

    // 把C语言的输入输出流转化成OC对象
    _inputStream = (__bridge NSInputStream *)(readStream);
    _outputStream = (__bridge NSOutputStream *)(writeStream);

    // 设置代理
    _inputStream.delegate = self;
    _outputStream.delegate = self;

    // 把输入输出流添加到主运行循环
    // 不添加主运行循环 代理有可能不工作
    [_inputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [_outputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];

    // 打开输入输出流
    [_inputStream open];
    [_outputStream open];
}

- (IBAction)loginBtnClick:(id)sender {

    // 登录
    // 发送用户名和密码
    // 在这里做的时候，只发用户名，密码就不用发送

    // 如果要登录，发送的数据格式为 "iam:zhangsan";
    // 如果要发送聊天消息，数据格式为 "msg:did you have dinner";

    //登录的指令
    NSString *loginStr = @"iam:zhangsan";

    //把Str转成NSData
    NSData *data = [loginStr dataUsingEncoding:NSUTF8StringEncoding];

    [_outputStream write:data.bytes maxLength:data.length];
}

#pragma mark 读取服务器返回的数据
-(void)readData{

    //建立一个缓冲区 可以放1024个字节
    uint8_t buf[1024];

    // 返回实际装的字节数
    NSInteger len = [_inputStream read:buf maxLength:sizeof(buf)];

    // 把字节数组转化成字符串
    NSData *data = [NSData dataWithBytes:buf length:len];

    // 从服务器接收到的数据
    NSString *recStr =  [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    NSLog(@"%@",recStr);

    [self reloadDataWithText:recStr];

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField{

    NSString *text = textField.text;

    NSLog(@"%@",text);
    // 聊天信息
    NSString *msgStr = [NSString stringWithFormat:@"msg:%@",text];

    //把Str转成NSData
    NSData *data = [msgStr dataUsingEncoding:NSUTF8StringEncoding];

    // 刷新表格
    [self reloadDataWithText:msgStr];

    // 发送数据
    [_outputStream write:data.bytes maxLength:data.length];

    // 发送完数据，清空textField
    textField.text = nil;

    return YES;
}

-(void)reloadDataWithText:(NSString *)text{
    [self.chatMsgs addObject:text];

    [self.tableView reloadData];

    // 数据多，应该往上滚动
    NSIndexPath *lastPath = [NSIndexPath indexPathForRow:self.chatMsgs.count - 1 inSection:0];
    [self.tableView scrollToRowAtIndexPath:lastPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}

#pragma mark 表格的数据源

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return self.chatMsgs.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *ID = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];

    cell.textLabel.text = self.chatMsgs[indexPath.row];

    return cell;
}

-(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    [self.view endEditing:YES];
}
@end

ps:注意：

1.前提需要连接服务器

2.输入输出流需要添加到主运行循环

3.输入流：用来写数据

4.输出流：用来读数据

步骤总结：

1.建立连接，设置ip和端口号

2.通过建立C语言输入输出流，连接服务器，再把C语言的输入输出流转换成OC对象

3.设置OC类型的输入输出流代理为当前控制器

4.把输入输出流添加到主运行循环当中，打开输入输出流

5.客户端向服务器发送数据（输出流）

6.服务器向客户端返回数据（输入流）

7.当前控制器刷新主界面数据

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