1、从苹果服务器上查询已发布的最新应用版本号

请求的URL地址 : http://itunes.apple.com/lookup?id=你的应用程序的ID

返回的数据为json格式，包括开发者ID、开发者名称、应用ID、应用名称、版本号等

获取其中的版本号 :

NSArray *array = responseObject[@"results"];

NSDictionary *dict = [array lastObject];

NSString *serverVersion = dict[@"version"];

2> 获取当前应用的版本号

NSString *curVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

3> 比较两者，如果服务器上的版本号 > 当前应用版本号，则提示用户

/**

 * check new version

 */

- (void)checkNewVersionApp

{

    AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] init];

    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/html", @"text/plain", @"text/javascript", @"text/json", nil];;

    manager.requestSerializer.timeoutInterval = 5.f;

    [manager POST:@""

       parameters:nil

          success:^(NSURLSessionDataTask *task, id responseObject)

     {

         BOOL hasNewVersion = false;

         NSString *curVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

         NSArray *curVersionArr = [curVersion componentsSeparatedByString:@"."];

         NSArray *array = responseObject[@"results"];

         NSDictionary *dict = [array lastObject];

         serverVersion = dict[@"version"];

        

         NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

         NSString *ignoreAppVersion = [userDefaults objectForKey:@"ignoreAppVersion"];

         if([serverVersion isEqualToString:ignoreAppVersion])

         {

             return;

         }

         NSArray *serverVersionArr = [serverVersion componentsSeparatedByString:@"."];

         if (curVersionArr.count > serverVersionArr.count)

         {

             // 1.2.1   1.3

             for (int i = 0; i < serverVersionArr.count; i++)

             {

                 int oldVersion = [curVersionArr[i] intValue];

                 int newVersion = [serverVersionArr[i] intValue];

                 if (oldVersion < newVersion)

                 {

                     hasNewVersion = true;

                     break;

                 }

                 else if (oldVersion > newVersion)

                 {

                     break;

                 }

             }

         }

         else if (curVersionArr. count < serverVersionArr. count )

         {

             // 1.2   1.3.1

             for ( int i = 0 ; i < curVersionArr. count ; i++)

             {

                 int oldVersion = [curVersionArr[i] intValue ];

                 int newVersion = [serverVersionArr[i] intValue ];

                 if (oldVersion < newVersion)

                 {

                     hasNewVersion = true ;

                     break ;

                 }

                 else if (oldVersion > newVersion)

                 {

                     break;

                 }

             }

         }

         else

         {

             // 1.2   1.3

             for ( int i = 0 ; i < curVersionArr. count ; i++)

             {

                 int oldVersion = [curVersionArr[i] intValue ];

                 int newVersion = [serverVersionArr[i] intValue ];

                 if (oldVersion < newVersion)

                 {

                     hasNewVersion = true ;

                     break ;

                 }

                 else if (oldVersion > newVersion)

                 {

                     break;

                 }

             }

         }

         if (hasNewVersion)

         {

             // 存在新版本，提示用户更新

             UIAlertView *alert = [[ UIAlertView alloc ] initWithTitle : @" 发现新版本 " message :[ NSString stringWithFormat : @" 电梯保 v%@ ，赶快去体验吧 " , serverVersion ] delegate : self cancelButtonTitle : @" 暂不更新 " otherButtonTitles : @" 跳过此版本 " , @" 更新 " , nil ];

             [alert show ];

         }

     }

          failure :^( NSURLSessionDataTask *task, NSError *error)

     {

         NSLog ( @"%@" , error);

     }];

}

#pragma mark - UIAlertViewDelegate

- ( void )alertView:( UIAlertView *)alertView clickedButtonAtIndex:( NSInteger )buttonIndex

{

    switch (buttonIndex)

    {

        case 0 :

            break ;

        case 1 :

            [[ NSUserDefaults standardUserDefaults ] setObject : serverVersion forKey : @"ignoreAppVersion" ];

            break ;

        case 2 :

            [[ UIApplication sharedApplication ] openURL :[ NSURL URLWithString : @"" ]];

            break ;

    }

}