在專案中使用到了廣播訊息，例如廣播通知
首先匯入

pod 'SocketRocket', '~> 0.5.0'

引入4個庫
libicucore.dylib，CFNetwork.framework, Security.framework, Foundation.framework

#import "dynamicMessageTableViewCell.h"
#import "BBCyclingLabel.h"
#import <SocketRocket/SRWebSocket.h>

@interface dynamicMessageTableViewCell
 
()<SRWebSocketDelegate>
{
    BBCyclingLabel * _bbCyclingLable;
    NSMutableArray * _titleArr;
//    UITextField * _text;
    int a;
    int _msgCount;
    SRWebSocket * _webSocket;

}

@end

@implementation dynamicMessageTableViewCell
-(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString
 
 *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {

        a = 0;
        _titleArr = [[NSMutableArray alloc] init];

        UIImageView *imagev = [[UIImageView alloc]initWithFrame:CGRectMake(12, 4, 14, 12)];
        [imagev setImage:GetImage(@"ico-notice.png"
 
)];
        [self addSubview:imagev];
        [self createUI];
    }
    return self;
}

-(void)createUI
{
//獲取本地儲存的資料
    NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults];
    //讀取陣列NSArray型別的資料
    NSArray *myArray = [[NSArray alloc] initWithArray:[userDefaultes arrayForKey:@"messageArray"]];
    _titleArr = [myArray mutableCopy];

    _bbCyclingLable  = [[BBCyclingLabel alloc]initWithFrame:CGRectMake(40, 0, SCREEN_WIDTH-40, 20) andTransitionType:BBCyclingLabelTransitionEffectScrollUp];
    _bbCyclingLable.font = GetFont(BFONT_12);
    _bbCyclingLable.clipsToBounds = YES;
    [self addSubview:_bbCyclingLable];

    NSTimer *time = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(change) userInfo:nil repeats:YES];
    [time fire];

    _webSocket.delegate = nil;
    [_webSocket close];
    _webSocket = [[SRWebSocket alloc] initWithURLRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"ws://49.213.11.伺服器埠"]]];

    _webSocket.delegate = self;
    [_webSocket open];
}

//陣列中的內容僅供測試用，具體內容可以通過後臺伺服器獲取或者寫死（資料條數可以改變，我寫的是3條）
-(void)change
{
    if (_titleArr.count >0) {
        if (0<=a && a<_titleArr.count) {
            _bbCyclingLable.text = [_titleArr objectAtIndex:a];
        }else{
            a=0;
            _bbCyclingLable.text = [_titleArr objectAtIndex:a];
        }
        a++;
    }
}

//這個的目的是往伺服器上傳資料，做即時通訊的時候傳送的訊息用這個方法

#pragma mark - SRWebSocketDelegate
- (void)webSocketDidOpen:(SRWebSocket *)webSocket;{

    NSLog(@"Websocket Connected");
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:@{@"id":@"chat",@"clientid":@"hxz",@"to":@""} options:NSJSONWritingPrettyPrinted error:&error];

    NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    [webSocket send:jsonString];
}

//失敗
- (void)webSocket:(SRWebSocket *)webSocket didFailWithError:(NSError *)error;{

    NSLog(@":( Websocket Failed With Error %@", error);
    webSocket = nil;
}

//收到的訊息
- (void)webSocket:(SRWebSocket *)webSocket didReceiveMessage:(id)message;{

    NSLog(@"Received \"%@\"", message);
    NSString * mesStr = (NSString *)message;
    NSArray * arr = [mesStr componentsSeparatedByString:@","];

    for (NSString * str in arr) {
        [_titleArr addObject:str];
        //最多存5條記錄
        if(_titleArr.count > 5)
        {
            [_titleArr removeObjectAtIndex:0];
        }
    }

    //將上述資料全部儲存到NSUserDefaults中
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setObject:_titleArr forKey:@"messageArray"];
}

//結束關閉
- (void)webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean;{

    NSLog(@"WebSocket closed");
    webSocket = nil;
}