iOS开发——网络编程OC篇&GCDAsyncSocket编程

 1 @interface ViewController ()<UITextFieldDelegate,UITableViewDataSource,UITableViewDelegate,GCDAsyncSocketDelegate>{
 2     
 3     GCDAsyncSocket *_socket;
 4 }
 5 @property (weak, nonatomic) IBOutlet NSLayoutConstraint *inputViewConstraint;
 6 @property (weak, nonatomic) IBOutlet UITableView *tableView;
 7 
 8 @property (nonatomic, strong) NSMutableArray *chatMsgs;//聊天消息数组
 9 
10 @end

1 -(NSMutableArray *)chatMsgs{
2     if (!_chatMsgs) {
3         _chatMsgs = [NSMutableArray array];
4     }
5     
6     return _chatMsgs;
7 }

 1 - (IBAction)connectToHost:(id)sender {
 2     // 1.建立连接
 3     NSString *host = @"127.0.0.1";
 4     int port = 12345;
 5     
 6     // 创建一个Socket对象
 7     _socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
 8     
 9     // 连接
10     NSError *error = nil;
11     [_socket connectToHost:host onPort:port error:&error];
12     if (error) {
13         NSLog(@"%@",error);
14     }
15 }

 1 #pragma mark -AsyncSocket的代理
 2 #pragma mark 连接主机成功
 3 -(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
 4     NSLog(@"连接主机成功");
 5 }
 6 
 7 #pragma mark 与主机断开连接
 8 -(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{
 9 
10     if(err){
11         NSLog(@"断开连接 %@",err);
12     }
13 }

 1 - (IBAction)loginBtnClick:(id)sender {
 2     
 3     // 登录
 4     // 发送用户名和密码
 5     // 在这里做的时候，只发用户名，密码就不用发送
 6     
 7     // 如果要登录，发送的数据格式为 "iam:zhangsan";
 8     // 如果要发送聊天消息，数据格式为 "msg:did you have dinner";
 9     
10     //登录的指令
11     NSString *loginStr = @"iam:zhangsan";
12     
13     //把Str转成NSData
14     NSData *data = [loginStr dataUsingEncoding:NSUTF8StringEncoding];
15 
16     
17     //[_outputStream write:data.bytes maxLength:data.length];
18     // 发送登录指令给服务
19     [_socket writeData:data withTimeout:-1 tag:101];
20 }

 1 -(BOOL)textFieldShouldReturn:(UITextField *)textField{
 2     
 3     NSString *text = textField.text;
 4     
 5     NSLog(@"%@",text);
 6     // 聊天信息
 7     NSString *msgStr = [NSString stringWithFormat:@"msg:%@",text];
 8     
 9     //把Str转成NSData
10     NSData *data = [msgStr dataUsingEncoding:NSUTF8StringEncoding];
11     
12     // 刷新表格
13     [self reloadDataWithText:msgStr];
14     
15     // 发送数据
16     [_socket writeData:data withTimeout:-1 tag:102];
17     
18     // 发送完数据，清空textField
19     textField.text = nil;
20     
21     return YES;
22 }
23 
24 #pragma mark 数据成功发送到服务器
25 -(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag{
26     NSLog(@"数据成功发送到服务器");
27     //数据发送成功后，自己调用一下读取数据的方法，接着_socket才会调用下面的代理方法
28     [_socket readDataWithTimeout:-1 tag:tag];
29 }
30 
31 #pragma mark 服务器有数据，会调用这个方法
32 -(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
33     // 从服务器接收到的数据
34     NSString *recStr =  [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
35     
36     NSLog(@"%@ %ld %@",[NSThread currentThread],tag, recStr);
37     
38     if (tag == 102) {//聊天返回的数据
39         // 刷新表格
40         [self reloadDataWithText:recStr];
41     }
42 //    }else if(tag == 101 ){//登录返回数据，不应该把数据添加到表格里
43 //
44 //
45 //    }
46    
47 }

 1 -(void)reloadDataWithText:(NSString *)text{
 2     [self.chatMsgs addObject:text];
 3     
 4     // UI刷新要主线程
 5     dispatch_async(dispatch_get_main_queue(), ^{
 6         [self.tableView reloadData];
 7         
 8         // 数据多，应该往上滚动
 9         NSIndexPath *lastPath = [NSIndexPath indexPathForRow:self.chatMsgs.count - 1 inSection:0];
10         [self.tableView scrollToRowAtIndexPath:lastPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
11     });
12   
13 }
14 
15 #pragma mark 表格的数据源
16 
17 -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
18     return self.chatMsgs.count;
19 }
20 
21 
22 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
23 {
24     static NSString *ID = @"Cell";
25     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
26    
27     cell.textLabel.text = self.chatMsgs[indexPath.row];
28     
29     return cell;
30 }
31 
32 -(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
33     [self.view endEditing:YES];
34 }

 1     
 2     // 监听键盘
 3     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(kbFrmWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
 4 }
 5 
 6 
 7 -(void)kbFrmWillChange:(NSNotification *)noti{
 8     NSLog(@"%@",noti.userInfo);
 9     
10     // 获取窗口的高度
11     
12     CGFloat windowH = [UIScreen mainScreen].bounds.size.height;
13     
14    
15     
16     // 键盘结束的Frm
17     CGRect kbEndFrm = [noti.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
18      // 获取键盘结束的y值
19     CGFloat kbEndY = kbEndFrm.origin.y;
20     
21     
22     self.inputViewConstraint.constant = windowH - kbEndY;
23 }