文字游戏就不说了..那些定义什么TCP.UDP,三次握手啊,,也就是面试需要问.这里直接介绍使用方法
这里使用了facebook的SocketRocket框架进行二次封装直接替换ipurl和心跳包就可以使用了
#import <Foundation/Foundation.h>
#import "SRWebSocket.h"
NS_ASSUME_NONNULL_BEGIN
@interface WebSocketManager : NSObject
@property (nonatomic, strong) SRWebSocket *webSocket;
+ (instancetype)sharedSocketManager;//单例
- (void)connectServer;//建立长连接
- (void)SRWebSocketClose;//关闭长连接
- (void)sendDataToServer:(NSDictionary*)data;//发送数据给服务器
//主线程异步队列
#define dispatch_main_async_safe(block)\
if ([NSThread isMainThread]) {\
block();\
} else {\
dispatch_async(dispatch_get_main_queue(), block);\
}
#define WS(f) __weak __typeof(self) f = self
#define ipurl @"ws://112.74.63.194:8080/websocket"
#define HEART @"heart"
#import "WebSocketManager.h"
@interface WebSocketManager()<SRWebSocketDelegate>
@property (nonatomic, strong) NSTimer *heartBeatTimer; //心跳定时器
@property (nonatomic, strong) NSTimer *netWorkTestingTimer; //没有网络的时候检测网络定时器
@property (nonatomic, strong) dispatch_queue_t queue; //数据请求队列（串行队列）
@property (nonatomic, assign) NSTimeInterval reConnectTime; //重连时间
@property (nonatomic, strong) NSMutableArray *sendDataArray; //存储要发送给服务端的数据
@property (nonatomic, assign) BOOL isActivelyClose; //用于判断是否主动关闭长连接，如果是主动断开连接，连接失败的代理中，就不用执行 重新连接方法
@end
@implementation WebSocketManager
//单例
+ (instancetype)sharedSocketManager
{
static WebSocketManager *_instace = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken,^{
_instace = [[self alloc] init];
});
return _instace;
}
- (instancetype)init
{
self = [super init];
if(self)
{
self.reConnectTime = 0;
self.isActivelyClose = NO;
self.queue = dispatch_queue_create("BF",NULL);
self.sendDataArray = [[NSMutableArray alloc] init];
}
return self;
}
#pragma mark - NSTimer
//初始化心跳
- (void)initHeartBeat
{
//心跳没有被关闭
if(self.heartBeatTimer)
{
return;
}
[self destoryHeartBeat];
WS(weakSelf);
dispatch_main_async_safe(^{
weakSelf.heartBeatTimer = [NSTimer timerWithTimeInterval:10 target:weakSelf selector:@selector(senderheartBeat) userInfo:nil repeats:true];
[[NSRunLoop currentRunLoop]addTimer:weakSelf.heartBeatTimer forMode:NSRunLoopCommonModes];
});
}
//取消心跳
- (void)destoryHeartBeat
{
WS(weakSelf);
dispatch_main_async_safe(^{
if(weakSelf.heartBeatTimer)
{
[weakSelf.heartBeatTimer invalidate];
weakSelf.heartBeatTimer = nil;
}
});
}
//没有网络的时候开始定时 -- 用于网络检测
- (void)noNetWorkStartTestingTimer
{
WS(weakSelf);
dispatch_main_async_safe(^{
weakSelf.netWorkTestingTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:weakSelf selector:@selector(noNetWorkStartTesting) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:weakSelf.netWorkTestingTimer forMode:NSDefaultRunLoopMode];
});
}
//取消网络检测
- (void)destoryNetWorkStartTesting
{
WS(weakSelf);
dispatch_main_async_safe(^{
if(weakSelf.netWorkTestingTimer)
{
[weakSelf.netWorkTestingTimer invalidate];
weakSelf.netWorkTestingTimer = nil;
}
});
}
#pragma mark - private -- webSocket相关方法
//发送心跳
- (void)senderheartBeat
{
//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
WS(weakSelf);
dispatch_main_async_safe(^{
if(weakSelf.webSocket.readyState == SR_OPEN)
{
[weakSelf.webSocket sendPing:[HEART dataUsingEncoding:NSUTF8StringEncoding]];
}
});
}
//定时检测网络
- (void)noNetWorkStartTesting
{
//有网络
if(AFNetworkReachabilityManager.sharedManager.networkReachabilityStatus != AFNetworkReachabilityStatusNotReachable)
{
//关闭网络检测定时器
[self destoryNetWorkStartTesting];
//开始重连
[self reConnectServer];
}
}
//建立长连接
- (void)connectServer
{
self.isActivelyClose = NO;
if(self.webSocket)
{
self.webSocket = nil;
}
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:ipurl]];
self.webSocket = [[SRWebSocket alloc] initWithURLRequest:request];
self.webSocket.delegate = self;
[self.webSocket open];
}
//重新连接服务器
- (void)reConnectServer
{
if(self.webSocket.readyState == SR_OPEN)
{
return;
}
if(self.reConnectTime > 1024) //重连10次 2^10 = 1024
{
self.reConnectTime = 0;
return;
}
WS(weakSelf);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.reConnectTime *NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
if(weakSelf.webSocket.readyState == SR_OPEN && weakSelf.webSocket.readyState == SR_CONNECTING)
{
return;
}
[weakSelf connectServer];
DLog(@"正在重连......");
if(weakSelf.reConnectTime == 0) //重连时间2的指数级增长
{
weakSelf.reConnectTime = 2;
}
else
{
weakSelf.reConnectTime *= 2;
}
});
}
//关闭连接
- (void)SRWebSocketClose;
{
self.isActivelyClose = YES;
[self webSocketClose];
//关闭心跳定时器
[self destoryHeartBeat];
//关闭网络检测定时器
[self destoryNetWorkStartTesting];
}
//关闭连接
- (void)webSocketClose
{
if(self.webSocket)
{
[self.webSocket close];
self.webSocket = nil;
}
}
//发送数据给服务器
- (void)sendDataToServer:(NSDictionary*)data
{
NSData *data= [NSJSONSerialization dataWithJSONObject: data options:NSJSONWritingPrettyPrinted error:nil];
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
[self.sendDataArray addObject: jsonString];
[self sendeDataToServer];
}
- (void)sendeDataToServer
{
WS(weakSelf);
//把数据放到一个请求队列中
dispatch_async(self.queue, ^{
//没有网络
if (AFNetworkReachabilityManager.sharedManager.networkReachabilityStatus == AFNetworkReachabilityStatusNotReachable)
{
//开启网络检测定时器
[weakSelf noNetWorkStartTestingTimer];
}
else //有网络
{
if(weakSelf.webSocket != nil)
{
// 只有长连接OPEN开启状态才能调 send 方法，不然会Crash
if(weakSelf.webSocket.readyState == SR_OPEN)
{
if (weakSelf.sendDataArray.count > 0)
{
NSString *data = weakSelf.sendDataArray[0];
[weakSelf.webSocket send:data]; //发送数据
[weakSelf.sendDataArray removeObjectAtIndex:0];
if([weakSelf.sendDataArray count] > 0)
{
[weakSelf sendeDataToServer];
}
}
}
else if (weakSelf.webSocket.readyState == SR_CONNECTING) //正在连接
{
DLog(@"正在连接中，重连后会去自动同步数据");
}
else if (weakSelf.webSocket.readyState == SR_CLOSING || weakSelf.webSocket.readyState == SR_CLOSED) //断开连接
{
//调用 reConnectServer 方法重连,连接成功后 继续发送数据
[weakSelf reConnectServer];
}
}
else
{
[weakSelf connectServer]; //连接服务器
}
}
});
}
#pragma mark - SRWebSocketDelegate -- webSockect代理
//连接成功回调
- (void)webSocketDidOpen:(SRWebSocket *)webSocket
{
DLog(@"webSocket === 连接成功");
[self initHeartBeat]; //开启心跳
//如果有尚未发送的数据，继续向服务端发送数据
if ([self.sendDataArray count] > 0){
[self sendeDataToServer];
}
}
//连接失败回调
- (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error
{
//用户主动断开连接，就不去进行重连
if(self.isActivelyClose)
{
return;
}
[self destoryHeartBeat]; //断开连接时销毁心跳
DLog(@"连接失败，这里可以实现掉线自动重连，要注意以下几点");
DLog(@"1.判断当前网络环境，如果断网了就不要连了，等待网络到来，在发起重连");
DLog(@"3.连接次数限制，如果连接失败了，重试10次左右就可以了");
//判断网络环境
if (AFNetworkReachabilityManager.sharedManager.networkReachabilityStatus == AFNetworkReachabilityStatusNotReachable) //没有网络
{
[self noNetWorkStartTestingTimer];//开启网络检测定时器
}
else //有网络
{
[self reConnectServer];//连接失败就重连
}
}
//连接关闭,注意连接关闭不是连接断开，关闭是 [socket close] 客户端主动关闭，断开可能是断网了，被动断开的。
- (void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean
{
// 在这里判断 webSocket 的状态 是否为 open , 大家估计会有些奇怪 ，因为我们的服务器都在海外，会有些时间差，经过测试，我们在进行某次连接的时候，上次重连的回调刚好回来，而本次重连又成功了，就会误以为，本次没有重连成功，而再次进行重连，就会出现问题，所以在这里做了一下判断
if(self.webSocket.readyState == SR_OPEN || self.isActivelyClose)
{
return;
}
DLog(@"被关闭连接，code:%ld,reason:%@,wasClean:%d",code,reason,wasClean);
[self destoryHeartBeat]; //断开连接时销毁心跳
//判断网络环境
if (AFNetworkReachabilityManager.sharedManager.networkReachabilityStatus == AFNetworkReachabilityStatusNotReachable) //没有网络
{
[self noNetWorkStartTestingTimer];//开启网络检测
}
else //有网络
{
[self reConnectServer];//连接失败就重连
}
}
//该函数是接收服务器发送的pong消息，其中最后一个参数是接受pong消息的
-(void)webSocket:(SRWebSocket *)webSocket didReceivePong:(NSData*)pongPayload
{
NSString* reply = [[NSString alloc] initWithData:pongPayload encoding:NSUTF8StringEncoding];
DLog(@"reply === 收到后台心跳回复 Data:%@",reply);
}
//收到服务器发来的数据
- (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message
{
DLog(@"%@",message);
// NSMutableDictionary *dataDic = [NSMutableDictionary dictionaryWithJsonString:message];
// NSMutableDictionary *dataDic = [NSMutableDictionary diction]
/*根据具体的业务做具体的处理*/
}
@end
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