iOS socket 实现tcp和服务器长链接的简单使用心得

首先iOS端用了一个第三方的框架

GCDAsyncSocket

当然这个是CocoaAsyncSocket框架里面的一部分

Github下载地址https://github.com/robbiehanson/CocoaAsyncSocket

首先这个框架不能直接使用，因为直接使用的话会收不到服务器发过来的信息代理方法会不响应；

原因似乎是因为内存管理方面的会释放掉代理，具体的不太清楚

所以自己写一个单列初始化GCDAsyncSocket实现其代理，然后自定义代理就可以接受消息了

单列代码.h文件如下

#import <Foundation/Foundation.h>

#import "GCDAsyncSocket.h"

@protocol TcpManagerDelegate <NSObject>

-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port;

-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err;

-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag;

-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag;

@end

@interface TcpManager : NSObject

@property(strong,nonatomic) GCDAsyncSocket *asyncsocket;

@property(nonatomic,strong)id<TcpManagerDelegate>delegate;

+(TcpManager *)Share;

-(BOOL)destroy;

@end

.m文件如下

#import "TcpManager.h"

@interface TcpManager() <GCDAsyncSocketDelegate>

@end

@implementation TcpManager

+(TcpManager *)Share

{

static TcpManager *manager=nil;

static dispatch_once_t once;

dispatch_once(&once, ^{

manager=[[TcpManager alloc]init];

manager.asyncsocket=[[GCDAsyncSocket alloc]initWithDelegate:manager delegateQueue:dispatch_get_main_queue()];

});

return manager;

}

-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port

{

if ([self.delegate respondsToSelector:@selector(socket:didConnectToHost:port:)]) {

[self.delegate socket:sock didConnectToHost:host port:port];

}

}

-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err

{

if ([self.delegate respondsToSelector:@selector(socketDidDisconnect:withError:)]) {

[self.delegate socketDidDisconnect:sock withError:err];

}

}

-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag

{

if ([self.delegate respondsToSelector:@selector(socket:didReadData:withTag:)]) {

[self.delegate socket:sock didReadData:data withTag:tag];

}

//    [sock disconnect];

}

-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag

{

if ([self.delegate respondsToSelector:@selector(socket:didWriteDataWithTag:)]) {

[self.delegate socket:sock didWriteDataWithTag:tag];

}

}

-(NSTimeInterval)socket:(GCDAsyncSocket *)sock shouldTimeoutWriteWithTag:(long)tag elapsed:(NSTimeInterval)elapsed bytesDone:(NSUInteger)length

{

NSLog(@"timeout");

return 0;

}

-(BOOL)destroy

{

[_asyncsocket disconnect];

return YES;

}

@end

具体的使用如下

TcpManager *tcp = [TcpManager Share];

tcp.delegate = self;

socket = tcp.asyncsocket;

if (![socket connectToHost:@"服务器IP" onPort:服务器监听端口号 error:nil]) {

NSLog(@"fail to connect");

}

刚才定义的代理方法如下

//链接服务器成功回调

- (void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{

if (self.time == nil) {

self.time = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(checkLongConnectByServe) userInfo:nil repeats:YES];

[self.time fire];

}

}

// 心跳连接

-(void)checkLongConnectByServe{

// 向服务器发送固定可是的消息，来检测长连接

NSString *longConnect = @"connect";

NSData   *data  = [longConnect dataUsingEncoding:NSUTF8StringEncoding];

[socket writeData:data withTimeout:3 tag:1];

[socket readDataWithTimeout:30 tag:2];

}

//收到信息回调

-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{

NSString * string = [[NSString alloc]

initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"didReadData===========>%@",string);

}

-(void)socket:(GCDAsyncSocket *)sock didAcceptNewSocket:(GCDAsyncSocket *)newSocket{

NSLog(@"===========>didAcceptNewSocket");

}

-(void)socketDidDisconnect:(GCDAsyncSocket *)sock withError:(NSError *)err{

NSLog(@"===========>断开了");

}

//信息发送成功回调

-(void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)tag{

NSLog(@"===========>写入成功");

}