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];