使用这个方法，只传入你的appId即可，在只有需要更新时才做处理。

不依赖三方，不依赖后台

/* 随便可修改的block */
typedef void(^completionHandlerSuccess)(NSDictionary *responseObject);
typedef void(^completionHandlerFail)(int code,NSString *message);

/**
 根据appid获取appstore上app的版本和当前app的版本进行对比，检查更新

 @param appId app上架后的id
 @param success
 @param fail
 */
- (void)checkAppVersionWithAppId:(NSString *)appId Success:(completionHandlerSuccess)success andFail:(completionHandlerFail)fail{
    NSString *url = [NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@",appId];
    NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfig];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:20];
    [request setHTTPMethod:@"GET"];//method
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        NSDictionary *result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
        NSLog(@"apiJsonResult = %@",result);
        id responseObject = result;
        if (responseObject != nil &&
            [responseObject isKindOfClass:[NSDictionary class]] &&
            [[responseObject objectForKey:@"results"] isKindOfClass:[NSArray class]] &&
            [[responseObject objectForKey:@"results"] firstObject] !=nil &&
            [[[responseObject objectForKey:@"results"] firstObject] isKindOfClass:[NSDictionary class]]) {
            
           //返回的json信息
            NSDictionary *appStoreInfo = [[responseObject objectForKey:@"results"] firstObject];
           //当前app信息
            NSDictionary *localInfo = [[NSBundle mainBundle] infoDictionary];
            
            //app在appstrore上版本
            NSString *appStoreVersion = [appStoreInfo objectForKey:@"version"];
           //app当前版本
            NSString *localVersion = [localInfo objectForKey:@"CFBundleShortVersionString"];
            
            NSInteger appStoreVersionNumber = [appStoreVersion integerValue];
            NSInteger localVersionNumber = [localVersion integerValue];
            
            if (appStoreVersionNumber<=localVersionNumber) {
                fail(0,@"暂无更新");
            }else{
                NSDictionary *updateInfo = @{@"title":@"应用更新", //标题
                                             @"version":appStoreVersion, //版本
                                             @"notes":[appStoreInfo objectForKey:@"releaseNotes"], //版本更新描述
                                             @"url":[appStoreInfo objectForKey:@"trackViewUrl"], //app页url
                                             };
                success(updateInfo);
            }    
        }
    }];
    [task resume];

}

ps:

1.只要在itunes connect里创建了应用就可以看到appId了,无需等审核完成

2.此方法检查的是version，并非build，在上架的时候控制好这个。

3.请求返回app的众多信息，需要的自己拿来用。

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