iOS使用GCDSocketManager实现长连接的方法

.h文件

#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

.m文件

#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

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