.h文件

#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

.m文件

#import "GCDSocketManager.h"

#define SocketHost @"地址"
#define SocketPort 端口

@interface GCDSocketManager()<GCDAsyncSocketDelegate>

//握手次數(shù)
@property(nonatomic,assign) NSInteger pushCount;

//斷開重連定時器
@property(nonatomic,strong) NSTimer *timer;

//重連次數(shù)
@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(diào)
- (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(wù)器發(fā)送數(shù)據(jù)
- (void)sendDataToServer {
    //發(fā)送數(shù)據(jù)代碼省略...
    
    //發(fā)送
    [self.socket writeData:jsonData withTimeout:-1 tag:1];
    
    //讀取數(shù)據(jù)
    [self.socket readDataWithTimeout:-1 tag:200];
}

//連接成功向服務(wù)器發(fā)送數(shù)據(jù)后,服務(wù)器會有響應(yīng)
- (void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
    
    [self.socket readDataWithTimeout:-1 tag:200];
    
    //服務(wù)器推送次數(shù)
    self.pushCount++;
    
   //在這里進(jìn)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(shù)據(jù)
}

#pragma mark 連接失敗
//連接失敗的回調(diào)
- (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(jìn)行重連
    if ([currentStatu isEqualToString:@"foreground"]) {
        
        //重連次數(shù)
        self.reconnectCount++;
        
        //如果連接失敗 累加1秒重新連接 減少服務(wù)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