错误描述

• 环境:AsyncSocket客户端建立TCP连接
• 情景1:在网络连接正常情况下，启动应用程序，对socket的连接、断开、重连等操作都没有问题；
• 情景2:在网络异常情况下启动应用程序然后恢复网络,或后台切换网路时,socket无法正常通信,显示连接成功，但是紧接着doCFReadStreamCallback回调中报错，然后就closeWithError
  • domain=kCFStreamErrorDomainPOSIX, error=57

一:网上查阅在release情况下指针释放问题,修改如下(并没有解决问题)

static void MyCFReadStreamCallback (CFReadStreamRef stream, CFStreamEventType type, void *pInfo)
{
    @autoreleasepool {
        
        AsyncSocket *theSocket =[[AsyncSocket alloc]init];
        theSocket =  (__bridge AsyncSocket *)pInfo;
        [theSocket doCFReadStreamCallback:type forStream:stream];
        
    }
}

�二.判断各种网络情况再选择重新连接(实测解决问题)

• 1.先检查有没有在onSocket:willDisconnectWithError:中去重新创建socket并连接,如果有要去掉,正确应该在- (void)onSocketDidDisconnect:(AsyncSocket *)sock中重新连接,否则会造成closeWithError运行报错

  • 注意调用顺序onSocket:willDisconnectWithError:->onSocketDidDisconnect:

• 2.根据网络状况判断是否进行重连

• 3.此处没有贴心跳包的代码,如果需要自行添加.

typedef enum SocketStatus{
    SocketOfflineByServer,
    SocketOfflineByUser,
    SocketOfflineByWifiCut,
}_SocketStatus;

- (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
{
    //对收到的数据进行校验&分析&处理
    NSDictionary *infoDic=[NSJSONSerialization JSONObjectWithData:sock.unreadData options:NSJSONReadingAllowFragments error:nil];
    NSLog(@"Socket发送失败 json=%@",infoDic);
    
    if (err.code == 57) {
        self.socket.userData = SocketOfflineByWifiCut;
    }
}

- (void)onSocketDidDisconnect:(AsyncSocket *)sock
{
    NSLog(@"断开连接,释放socket");
    if (sock.userData == SocketOfflineByServer) {
        // 服务器掉线，重连
        self.pushCount = 0;
        [self reconnectServer];
    }
    else if (sock.userData == SocketOfflineByUser) {
        // 如果由用户断开，不进行重连
        return;
    }else if (sock.userData == SocketOfflineByWifiCut) {
        
        // wifi断开，不进行重连
        return;
    }
}

- (void)cutOffScoket
{
    self.socket.userData = SocketOfflineByUser;
    NSLog(@"断开连接");
    if (self.socket!=nil) {
        [self.socket disconnect];
        [self.socket setDelegate:nil];
        self.socket = nil;
    }
}

- (void)reconnectServer{
    if (_socket!=nil) {
        [_socket disconnect];
        [_socket setDelegate:nil];
        _socket = nil;
    }
    self.socket = nil;
    self.socket = [[AsyncSocket alloc] initWithDelegate:self];
    NSError *error = nil;
    //重新连接
    [self.socket connectToHost:SocketHOST onPort:SokcetPORT error:&error];
    if (error) {
        NSLog(@"SocketAgainTryConnectError:%@",error);
    }
}

- (void)connectToServer
{

    self.socket = [[AsyncSocket alloc] initWithDelegate:self];
    self.socket.userData = SocketOfflineByServer;
    NSError *error = nil;
    //开始连接
    [self.socket connectToHost:SocketHOST onPort:SocketPORT error:&error];
    NSLog(@"tryConnect....");
    
    if (error) {
        NSLog(@"error=%@",error);
    }
}