//GCDAsyncSocketDelegate执行代理对象#import <Foundation/Foundation.h>
#import "CocoaAsyncSocket.h"typedef void(^DidReadData)(NSDictionary* didReadData);
/***  GCDAsyncSocketDelegate执行代理对象*/
@interface NSObjectGCDAsyncSocket : NSObject<GCDAsyncSocketDelegate>
/***  接收到数据的处理*/
@property(nonatomic,copy)DidReadData didReadData;
/***  发送的数据  如果添加新键值则需要先开辟内存*/
@property(nonatomic,retain)NSMutableDictionary* writeData;
/***  发送链接请求*/
-(BOOL)startConnect;
/***  单例*/
+(NSObjectGCDAsyncSocket*)defaultSocket;@end

//
//  NSObjectGCDAsyncSocket.m
//  attendance#import "NSObjectGCDAsyncSocket.h"@implementation NSObjectGCDAsyncSocket
{GCDAsyncSocket* socket;
}
/***  单例**  @return*/
+(NSObjectGCDAsyncSocket *)defaultSocket
{// socket只会实例化一次static NSObjectGCDAsyncSocket* socket=nil; // 保证线程安全，defaultSocket只执行一次static dispatch_once_t once;dispatch_once(&once, ^{socket=[[NSObjectGCDAsyncSocket alloc] init];});return socket;
}/***  初始化***  @return self*/
-(instancetype)init
{self=[super init];if (self){socket=[[GCDAsyncSocket alloc] initWithDelegate:selfdelegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];}return self;
}
/***  发送链接请求*/
-(BOOL)startConnect
{// 先确定断开连接再开始链接if (socket.isConnected){NSLog(@"主动断开");[socket disconnect];}NSError* error;BOOL  isSuccess= [socket connectToHost:SocketHostonPort:SocketPorterror:&error];if (error){NSLog(@"error.localizedDescription:%@",error.localizedDescription);}return isSuccess;}
#pragma mark - GCDAsyncSocketDelegate
/***  链接成功**  @param sock sock实例*  @param host IP*  @param port 端口*/
-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)hostport:(uint16_t)port
{//    NSLog(@"%s",__FUNCTION__);
//    NSLog(sock.isConnected?@"YES":@"NO");
//    if (sock.isConnected)
//    {// NSString上传需要加"\n"分隔符方可上传成功
/*[sock writeData:[@"ABCABCABCABCABCABC\n" dataUsingEncoding:NSUTF8StringEncoding]withTimeout:-1tag:0];*//*NSDictionary* nsDictionaryUser=@{@"gpsinfo":@"Gpsinfo",@"pswd":self.passWord,@"gpstype":@(2015),@"name":self.name,};NSDictionary* agrement=@{@"vertion":@(1),@"type1":@(2),@"type2":@(0),@"type3":@(0)};
*/if ([NSJSONSerialization isValidJSONObject:self.writeData]){
//            NSLog(@"isValidJSONObject");NSError* error;// 先转NSData再转NSString是为了保证NSDictionary格式不变NSData *nsDataUser= [NSJSONSerialization dataWithJSONObject:self.writeDataoptions:NSJSONWritingPrettyPrintederror:&error];NSString* json=[[NSString alloc] initWithData:nsDataUserencoding:NSUTF8StringEncoding];
//            NSLog(@"nsDictionaryUser:%@",json);json=[json stringByReplacingOccurrencesOfString:@"\n"withString:@""];json=[json stringByReplacingOccurrencesOfString:@" "withString:@""];json=[json stringByAppendingString:@"\n"];
//            NSLog(@"json:%@",json);[sock writeData:[json dataUsingEncoding:NSUTF8StringEncoding]withTimeout:-1tag:0];// 保持读取的长连接[sock readDataWithTimeout:-1tag:0];if (error){NSLog(@"localizedDescription:%@",[error localizedDescription]);NSLog(@"localizedFailureReason:%@",[error localizedFailureReason]);}}//    }}
/***  发送数据成功**  @param sock  sock实例*  @param tag  标记sock*/
-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag
{
//    NSLog(@"didWriteDataWithTag");
}
/***  已经获取到数据**  @param sock sock实例*  @param data 获取到的数据*  @param tag  标记sock*/
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)datawithTag:(long)tag
{//    NSLog(@"%s",__FUNCTION__);NSError* error=nil;NSDictionary* json=(NSDictionary*)[NSJSONSerialization JSONObjectWithData:dataoptions:NSJSONReadingAllowFragmentserror:&error];NSLog([NSJSONSerialization isValidJSONObject:json]?@"is ValidJSONObject":@"is't ValidJSONObject");if (error){NSLog(@"socketError1:%@",[error localizedDescription]);NSLog(@"socketError2:%@",[error localizedFailureReason]);}self.didReadData(json);[sock disconnect];}/***  链接出错**  @param sock sock实例*  @param err  错误参数*/
-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err
{
//    NSLog(@"%s",__FUNCTION__);if (err){NSLog(@"socketDidDisconnect:%@",[err localizedDescription]);NSLog(@"socketDidDisconnect:%@",[err localizedFailureReason]);}
//    self.didReadData(nil);
}@end

创建对象socket=[NSObjectGCDAsyncSocket defaultSocket];
填写发送的数据
socket.writeData=[NSMutableDictionary dictionaryWithDictionary:dictionary];
处理收到的数据socket.didReadData=^(NSDictionary* didReadData){.......}
开始链接
[socket startConnect];
添加CocoaAsyncSocket 第三库 链接地址:https://github.com/robbiehanson/CocoaAsyncSocket