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

#import "GCDSocketManager.h"
#define SocketHost @"地址"
#define SocketPort 端口
@interface GCDSocketManager()<GCDAsyncSocketDelegate>
//握手次數
@property(nonatomic,assign) NSInteger pushCount;
//斷開重連定時器
@property(nonatomic,strong) NSTimer *timer;
//重連次數
@property(nonatomic,assign) NSInteger reconnectCount;
@end
@implementation GCDSocketManager
//全局訪問點
+ (instancetype)sharedSocketManager {
  static GCDSocketManager *_instance = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    _instance = [[self alloc] init];
  });
  return _instance;
}
//可以在這里做一些初始化操作
- (instancetype)init
{
  self = [super init];
  if (self) {
    
  }
  return self;
}
#pragma mark 請求連接
//連接
- (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 連接成功
//連接成功的回調
- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port {
  DLog(@"socket連接成功");
  [self sendDataToServer];
}
//連接成功后向服務器發(fā)送數據
- (void)sendDataToServer {
  //發(fā)送數據代碼省略...
  
  //發(fā)送
  [self.socket writeData:jsonData withTimeout:-1 tag:1];
  
  //讀取數據
  [self.socket readDataWithTimeout:-1 tag:200];
}
//連接成功向服務器發(fā)送數據后,服務器會有響應
- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
  
  [self.socket readDataWithTimeout:-1 tag:200];
  
  //服務器推送次數
  self.pushCount++;
  
  //在這里進行校驗操作,情況分為成功和失敗兩種,成功的操作一般都是拉取數據
}
#pragma mark 連接失敗
//連接失敗的回調
- (void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err {
  DLog(@"Socket連接失敗");
  
  self.pushCount = 0;
  
  NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
  
  NSString *currentStatu = [userDefaults valueForKey:@"Statu"];
  
  //程序在前臺才進行重連
  if ([currentStatu isEqualToString:@"foreground"]) {
    
    //重連次數
    self.reconnectCount++;
    
    //如果連接失敗 累加1秒重新連接 減少服務器壓力
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 * self.reconnectCount target:self selector:@selector(reconnectServer) userInfo:nil repeats:NO];
    
    self.timer = timer;
  }
}
//如果連接失敗,5秒后重新連接
- (void)reconnectServer {
  
  self.pushCount = 0;
  
  self.reconnectCount = 0;
  
  //連接失敗重新連接
  NSError *error = nil;
  [self.socket connectToHost:SocketHost onPort:SocketPort error:&error];
  if (error) {
    DLog(@"SocektConnectError:%@",error);
  }
}
#pragma mark 斷開連接
//切斷連接
- (void)cutOffSocket {
  DLog(@"socket斷開連接");
  
  self.pushCount = 0;
  
  self.reconnectCount = 0;
  
  [self.timer invalidate];
  self.timer = nil;
  
  [self.socket disconnect];
}
@end