iOS ws服务连接

参照一篇对SRWebSocket封装的文章，具体链接找不到了，文件名是SocketRocketUtility。

SDSocketRocketUtility.h

#import "SDSocketRocketUtility.h"

#define dispatch_main_async_safe(block)
if ([NSThread isMainThread]) {
block();
} else {
dispatch_async(dispatch_get_main_queue(), block);
}

NSString * const kNeedPayOrderNote               = @"kNeedPayOrderNote";
NSString * const kWebSocketDidOpenNote           = @"kWebSocketDidOpenNote";
NSString * const kWebSocketDidCloseNote          = @"kWebSocketDidCloseNote";
NSString * const kWebSocketdidReceiveMessageNote = @"kWebSocketdidReceiveMessageNote";

@interface SDSocketRocketUtility()<SRWebSocketDelegate>
{
    int _index;
    NSTimer * heartBeat;
    NSTimeInterval reConnectTime;
}

@property (nonatomic,strong) SRWebSocket *socket;

@property (nonatomic,copy) NSString *urlString;

@end

SDSocketRocketUtility.m

//
//  SocketRocketUtility.m
//  SUN
//
//  Created by 孙俊 on 17/2/16.
//  Copyright © 2017年 SUN. All rights reserved.
//

#import "SDSocketRocketUtility.h"

#define dispatch_main_async_safe(block)
if ([NSThread isMainThread]) {
block();
} else {
dispatch_async(dispatch_get_main_queue(), block);
}

NSString * const kNeedPayOrderNote               = @"kNeedPayOrderNote";
NSString * const kWebSocketDidOpenNote           = @"kWebSocketDidOpenNote";
NSString * const kWebSocketDidCloseNote          = @"kWebSocketDidCloseNote";
NSString * const kWebSocketdidReceiveMessageNote = @"kWebSocketdidReceiveMessageNote";

@interface SDSocketRocketUtility()<SRWebSocketDelegate>
{
    int _index;
    NSTimer * heartBeat;
    NSTimeInterval reConnectTime;
}

@property (nonatomic,strong) SRWebSocket *socket;

@property (nonatomic,copy) NSString *urlString;

@end

@implementation SDSocketRocketUtility

+ (SDSocketRocketUtility *)instance {
    static SDSocketRocketUtility *Instance = nil;
    static dispatch_once_t predicate;
    dispatch_once(&predicate, ^{
        Instance = [[SDSocketRocketUtility alloc] init];
    });
    return Instance;
}

#pragma mark - **************** public methods
-(void)SRWebSocketOpenWithURLString:(NSString *)urlString {
    
    //如果是同一个url return
    if (self.socket) {
        return;
    }
    
    if (!urlString) {
        return;
    }
    
    self.urlString = urlString;
    
    self.socket = [[SRWebSocket alloc] initWithURLRequest:
                   [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];
    
    NSLog(@"请求的websocket地址：%@",self.socket.url.absoluteString);
    
    //SRWebSocketDelegate 协议
    self.socket.delegate = self;
    
    //开始连接
    [self.socket open];
}

- (void)SRWebSocketClose {
    if (self.socket){
        [self.socket close];
        self.socket = nil;
        //断开连接时销毁心跳
        [self destoryHeartBeat];
    }
}

#define WeakSelf(ws) __weak __typeof(&*self)weakSelf = self
- (void)sendData:(id)data {
    NSLog(@"socketSendData --------------- %@",data);
    
    WeakSelf(ws);
    dispatch_queue_t queue =  dispatch_queue_create("zy", NULL);
    
    dispatch_async(queue, ^{
        if (weakSelf.socket != nil) {
            // 只有 SR_OPEN 开启状态才能调 send 方法啊，不然要崩
            if (weakSelf.socket.readyState == SR_OPEN) {
                [weakSelf.socket send:data];    // 发送数据
                
            } else if (weakSelf.socket.readyState == SR_CONNECTING) {
                NSLog(@"正在连接中，重连后其他方法会去自动同步数据");
                // 每隔2秒检测一次 socket.readyState 状态，检测 10 次左右
                // 只要有一次状态是 SR_OPEN 的就调用 [ws.socket send:data] 发送数据
                // 如果 10 次都还是没连上的，那这个发送请求就丢失了，这种情况是服务器的问题了，小概率的
                // 代码有点长，我就写个逻辑在这里好了
                [self reConnect];
                
            } else if (weakSelf.socket.readyState == SR_CLOSING || weakSelf.socket.readyState == SR_CLOSED) {
                // websocket 断开了，调用 reConnect 方法重连
                
                NSLog(@"重连");
                
                [self reConnect];
            }
        } else {
            NSLog(@"没网络，发送失败，一旦断网 socket 会被我设置 nil 的");
            NSLog(@"其实最好是发送前判断一下网络状态比较好，我写的有点晦涩，socket==nil来表示断网");
        }
    });
}

#pragma mark - **************** private mothodes
//重连机制
- (void)reConnect {
    [self SRWebSocketClose];
    
    //超过一分钟就不再重连 所以只会重连5次 2^5 = 64
    if (reConnectTime > 64) {
        //您的网络状况不是很好，请检查网络后重试
        return;
    }
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(reConnectTime * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        self.socket = nil;
        [self SRWebSocketOpenWithURLString:self.urlString];
        NSLog(@"重连");
    });
    
    //重连时间2的指数级增长
    if (reConnectTime == 0) {
        reConnectTime = 2;
    } else {
        reConnectTime *= 2;
    }
}


//取消心跳
- (void)destoryHeartBeat {
    dispatch_main_async_safe(^{
        if (heartBeat) {
            if ([heartBeat respondsToSelector:@selector(isValid)]){
                if ([heartBeat isValid]){
                    [heartBeat invalidate];
                    heartBeat = nil;
                }
            }
        }
    })
}

//初始化心跳
- (void)initHeartBeat {
    dispatch_main_async_safe(^{
        [self destoryHeartBeat];
        //心跳设置10s
        heartBeat = [NSTimer timerWithTimeInterval:10 target:self selector:@selector(sentheart) userInfo:nil repeats:YES];
        //和服务端约定好发送什么作为心跳标识，尽可能的减小心跳包大小
        [[NSRunLoop currentRunLoop] addTimer:heartBeat forMode:NSRunLoopCommonModes];
    })
}

- (void)sentheart {
    //发送心跳 和后台可以约定发送什么内容  一般可以调用ping  我这里根据后台的要求 发送了data给他
    [self sendData:@"heart"];
}

//pingPong
- (void)ping {
    if (self.socket.readyState == SR_OPEN) {
        [self.socket sendPing:nil];
    }
}

#pragma mark - **************** SRWebSocketDelegate
- (void)webSocketDidOpen:(SRWebSocket *)webSocket {
    //每次正常连接的时候清零重连时间
    reConnectTime = 0;
    //开启心跳
    [self initHeartBeat];
    if (webSocket == self.socket) {
        NSLog(@"************************** socket 连接成功************************** ");
        [[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketDidOpenNote object:nil];
    }
}

- (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error {
    if (webSocket == self.socket) {
        NSLog(@"************************** socket 连接失败************************** ");
        _socket = nil;
        //连接失败就重连
        [self reConnect];
    }
}

- (void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean {
    if (webSocket == self.socket) {
        NSLog(@"************************** socket连接断开************************** ");
        NSLog(@"被关闭连接，code:%ld,reason:%@,wasClean:%d",(long)code,reason,wasClean);
        [self SRWebSocketClose];
        [[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketDidCloseNote object:nil];
    }
}

/*
 该函数是接收服务器发送的pong消息，其中最后一个是接受pong消息的，
 在这里就要提一下心跳包，一般情况下建立长连接都会建立一个心跳包，
 用于每隔一段时间通知一次服务端，客户端还是在线，这个心跳包其实就是一个ping消息，
 我的理解就是建立一个定时器，每隔十秒或者十五秒向服务端发送一个ping消息，这个消息可是是空的
 */
- (void)webSocket:(SRWebSocket *)webSocket didReceivePong:(NSData *)pongPayload {
    NSString *reply = [[NSString alloc] initWithData:pongPayload encoding:NSUTF8StringEncoding];
    NSLog(@"reply===%@",reply);
}

- (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message  {
    
    if (webSocket == self.socket) {
        NSLog(@"************************** socket收到数据了************************** ");
        NSLog(@"我这后台约定的 message 是 json 格式数据收到数据，就按格式解析吧，然后把数据发给调用层");
        NSLog(@"message:%@",message);
        if (message != nil) {
            //if ([message containsString:@"ip"]) {
        
               // NSData * clientData = [message dataUsingEncoding:NSUTF8StringEncoding];
                //if (clientData != nil) {
                  //  NSDictionary * clientIPDict = [NSJSONSerialization JSONObjectWithData:clientData options:NSJSONReadingMutableContainers error:nil];
                   // _clientIP = clientIPDict[@"ip"];
               // }
           // }
            
            [[NSNotificationCenter defaultCenter] postNotificationName:kWebSocketdidReceiveMessageNote object:message];

        }
    }
}

#pragma mark - **************** setter getter
- (SRReadyState)socketReadyState {
    return self.socket.readyState;
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

/**
 *判断一个字符串是否是一个IP地址
 **/
- (BOOL)isValidIP:(NSString *)ip {
    NSString  *isIP = @"^([1-9]|([1-9][0-9])|(1[0-9][0-9])|(2[0-4][0-9])|(25[0-5]))(\.([0-9]|([1-9][0-9])|(1[0-9][0-9])|(2[0-4][0-9])|(25[0-5]))){3}$";
    NSRegularExpression *regular = [[NSRegularExpression alloc] initWithPattern:isIP options:0 error:nil];
    NSArray *results = [regular matchesInString:ip options:0 range:NSMakeRange(0, ip.length)];
    return results.count > 0;
}

@end

导入第三方SRWebSocket

使用方法在使用的视图控制器中导入SDSocketRocketUtility.h文件

连接

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(SRWebSocketDidOpen) name:kWebSocketDidOpenNote object:nil];

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(SRWebSocketDidReceiveMsg:) name:kWebSocketdidReceiveMessageNote object:nil];

[[SDSocketRocketUtility instance] SRWebSocketOpenWithURLString:@"连接地址"];

- (void)SRWebSocketDidOpen{

    NSLog(@"开启成功");

    //在成功后需要做的操作

}

- (void)SRWebSocketDidReceiveMsg:(NSNotification*)notification{

    //收到服务端发送过来的消息

 }

关闭

[[SDSocketRocketUtility instance] SRWebSocketClose];