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