-由于最近游戏项目需要接入socketio，而且只支持1.0的，一顿搜索，需要接入 Socket.IO-Client-Swift 9.0.1的版本 ，Podfile内容如下：

platform :ios, '8.0'
use_frameworks!#必须用到它
inhibit_all_warnings!

target 'LJMahjong-mobile' do
  pod 'Socket.IO-Client-Swift', '~> 9.0.1'
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['SWIFT_VERSION'] = '3'
    end
  end
end

由于是oc和swift混编，需要设置如下build Setting ->SWIFT_VERSION为3.0，如果找不到这个，可以新建个swift文件，再去找就能看到。
写了如下的工具类：SocketIOTool.h

#import "SocketIOTool.h"
#import "EvalStringTool.h"

@import SocketIO;

@interface SocketIOTool ()

@property (nonatomic, strong) SocketIOClient*  socketClient;

@end

@implementation SocketIOTool

static SocketIOTool *socketTool;

+(SocketIOTool *)shareInstance{
    if(!socketTool){
        socketTool = [SocketIOTool new];
    }
    return socketTool;
}

-(void)initSocketioInstanceWithUrl:(NSString *)url forceNew:(BOOL)forceNew query:(NSString *)query{
    if (_socketClient) {
        [_socketClient disconnect];
    }
    NSDictionary* paramDic = [self dictionaryWithJsonString:query];
    self.socketClient = [[SocketIOClient alloc] initWithSocketURL:[[NSURL alloc] initWithString:url] config:@{@"forceNew": @(forceNew), @"connectParams":paramDic, @"forceWebsockets":@(YES)}];
    //
    //    [_socketClient on:@"connect" callback:^(NSArray* data, SocketAckEmitter* ack) {
    //        NSLog(@"-------------------------------socket connect");
    //    }];
    //    [_socketClient on:@"ping" callback:^(NSArray* data, SocketAckEmitter* ack) {
    //        NSLog(@"-------------------------------socket ping");
    //    }];
    //    [_socketClient on:@"pong" callback:^(NSArray* data, SocketAckEmitter* ack) {
    //        NSLog(@"-------------------------------socket pong");
    //    }];
    //    [_socketClient on:@"disconnect" callback:^(NSArray* data, SocketAckEmitter* ack) {
    //        NSLog(@"-------------------------------socket disconnect");
    //    }];
    //    [_socketClient on:@"error" callback:^(NSArray* data, SocketAckEmitter* ack) {
    //        NSLog(@"-------------------------------socket error");
    //        [_socketClient connect];
    //    }];
    //    [_socketClient connect];
}

-(BOOL)isConnected{
    if (_socketClient.status == SocketIOClientStatusConnected) {
        return YES;
    }
    return NO;
}

-(void)connect{
    [_socketClient connect];
}

-(void)disconnect{
    [_socketClient disconnect];
}

-(void)emitWithEventName:(NSString *)eventName content:(NSString *)content handlerId:(NSString *)handlerId{
    OnAckCallback* callback = [_socketClient emitWithAck:eventName with:@[content]];
    [callback timingOutAfter:0 callback:^(NSArray * _Nonnull array) {
        [self  notifyHandler:handlerId isAck:YES content:content];
    }];
}

-(void)notifyHandler:(NSString*)handlerId isAck:(BOOL)isAck content:(NSString*)content{
    if (!handlerId) {
        return;
    }
    NSString *evalString = @"cc.bc.socketioWrapper.";
    if (isAck) {
        evalString = [evalString stringByAppendingString:[NSString stringWithFormat:@"onAck(\"%@\")", handlerId]];
    } else {
        evalString = [evalString stringByAppendingString:[NSString stringWithFormat:@"onReceiveCallback(\"%@\",\"%@\");", handlerId, content?content:@""]];
    }
    [EvalStringTool evalString:evalString];
}

-(void)onWithEventName:(NSString *)eventName handlerId:(NSString *)handlerId ack:(BOOL)ack{
    NSLog(@"xxxxxxxxx------------xxxxxxxxxxxxx----%@", eventName);
    [_socketClient on:eventName callback:^(NSArray * _Nonnull array, SocketAckEmitter * _Nonnull emitterListener) {
        NSLog(@"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx----%@", eventName);
        NSString* content = nil;
        NSLog(@"-------------------------------%@",  array);
        if (array.count>0) {
            //            if ([array[0] isKindOfClass:[NSNumber class]]) {
            //                content = [NSString stringWithFormat:@"%d", array[0]];
            //            }
            content = array[0];
        }
        [self notifyHandler:handlerId isAck:NO content:content];
        if (ack && content != nil) {
            @try {
                [emitterListener with:@[content]];
            } @catch (NSException *exception) {
                NSLog(@"%@", exception.reason);
            } @finally {
                
            }
        }
    }];
}

#pragma mark - private
- (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString
{
    if (jsonString == nil) {
        return @{};
    }
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *err = nil;
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&err];
        if(err) {
            NSLog(@"json解析失败：%@",err);
            return @{};
        }
    return dic;
}
@end

踩到的巨坑：由于客户端需要监听到 'ping'、'pong'这两个事件作其他功能的操作，但是这两个事件就是不进入on方法的回调，查了好久的资料还是无果，都没这方面的资料。后来点进源码看了

/// The set of events that are generated by the client.
public enum SocketClientEvent : String {
    /// Emitted when the client connects. This is also called on a successful reconnection.
    case connect

    /// Called when the socket has disconnected and will not attempt to try to reconnect.
    case disconnect

    /// Called when an error occurs.
    case error

    /// Called when the client begins the reconnection process.
    case reconnect

    /// Called each time the client tries to reconnect to the server.
    case reconnectAttempt

    /// Called every time there is a change in the client's status.
    case statusChange
}

并没有'ping'、'pong'这两个eventName；
最新的Socket.IO-Client-Swift 14.0.0是有这个eventName的，算是一个坑吧。

以上代码由于是接入到cocoscreater里，供调用，所以每个方法都封装了成了单独的。