iOS使用GCDSocketManager实现长连接的方法

#import <Foundation/Foundation.h>#import "GCDAsyncSocket.h"@interface GCDSocketManager : NSObject@property(nonatomic,strong) GCDAsyncSocket *socket;//单例+ (instancetype)sharedSocketManager;//连接- (void)connectToServer;//断开- (void)cutOffSocket;@end

#import "GCDSocketManager.h"#define SocketHost @"地址"#define SocketPort 端口@interface GCDSocketManager()<GCDAsyncSocketDelegate>//握手次数@property(nonatomic,assign) NSInteger pushCount;//断开重连定时器@property(nonatomic,strong) NSTimer *timer;//重连次数@property(nonatomic,assign) NSInteger reconnectCount;@end@implementation GCDSocketManager//全局访问点+ (instancetype)sharedSocketManager {  static GCDSocketManager *_instance = nil;  static dispatch_once_t onceToken;  dispatch_once(&onceToken, ^{    _instance = [[self alloc] init];  });  return _instance;}//可以在这里做一些初始化操作- (instancetype)init{  self = [super init];  if (self) {      }  return self;}#pragma mark 请求连接//连接- (void)connectToServer {  self.pushCount = 0;    self.socket = [[GCDAsyncSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];    NSError *error = nil;  [self.socket connectToHost:SocketHost onPort:SocketPort error:&error];    if (error) {    DLog(@"SocketConnectError:%@",error);  }}#pragma mark 连接成功//连接成功的回调- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port {  DLog(@"socket连接成功");  [self sendDataToServer];}//连接成功后向服务器发送数据- (void)sendDataToServer {  //发送数据代码省略...    //发送  [self.socket writeData:jsonData withTimeout:-1 tag:1];    //读取数据  [self.socket readDataWithTimeout:-1 tag:200];}//连接成功向服务器发送数据后,服务器会有响应- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {    [self.socket readDataWithTimeout:-1 tag:200];    //服务器推送次数  self.pushCount++;    //在这里进行校验操作,情况分为成功和失败两种,成功的操作一般都是拉取数据}#pragma mark 连接失败//连接失败的回调- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err {  DLog(@"Socket连接失败");    self.pushCount = 0;    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];    NSString *currentStatu = [userDefaults valueForKey:@"Statu"];    //程序在前台才进行重连  if ([currentStatu isEqualToString:@"foreground"]) {        //重连次数    self.reconnectCount++;        //如果连接失败 累加1秒重新连接 减少服务器压力    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 * self.reconnectCount target:self selector:@selector(reconnectServer) userInfo:nil repeats:NO];        self.timer = timer;  }}//如果连接失败,5秒后重新连接- (void)reconnectServer {    self.pushCount = 0;    self.reconnectCount = 0;    //连接失败重新连接  NSError *error = nil;  [self.socket connectToHost:SocketHost onPort:SocketPort error:&error];  if (error) {    DLog(@"SocektConnectError:%@",error);  }}#pragma mark 断开连接//切断连接- (void)cutOffSocket {  DLog(@"socket断开连接");    self.pushCount = 0;    self.reconnectCount = 0;    [self.timer invalidate];  self.timer = nil;    [self.socket disconnect];}@end