- (void)viewDidLoad

{

    [super viewDidLoad];

      ⋯⋯    

    [self checkVersion];   //检测升级

}

#pragma mark - 实现升级功能

//检测软件是否需要升级

-(void)checkVersion

{

    NSString *newVersion;

    NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/cn/lookup?id=692579125"];

    //通过url获取数据

    NSString *jsonResponseString =   [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];

    NSLog(@"通过appStore获取的数据是：%@",jsonResponseString);

    //解析json数据为数据字典

    NSDictionary *loginAuthenticationResponse = [self dictionaryFromJsonFormatOriginalData:jsonResponseString];

    //从数据字典中检出版本号数据

    NSArray *configData = [loginAuthenticationResponse valueForKey:@"results"];

    for(id config in configData)

    {

        newVersion = [config valueForKey:@"version"];

    }

    NSLog(@"通过appStore获取的版本号是：%@",newVersion);

    //获取本地软件的版本号

    NSString *localVersion = [[[NSBundle mainBundle]infoDictionary] objectForKey:@"CFBundleVersion"];

    NSString *msg = [NSString stringWithFormat:@"你当前的版本是V%@，发现新版本V%@，是否下载新版本？",localVersion,newVersion];

    //对比发现的新版本和本地的版本

    if ([newVersion floatValue] > [localVersion floatValue])

    {

        UIAlertView *createUserResponseAlert = [[UIAlertView alloc] initWithTitle:@"升级提示!" message:msg delegate:self cancelButtonTitle:@"下次再说" otherButtonTitles: @"现在升级", nil];

        [createUserResponseAlert show];

        [createUserResponseAlert release];

    }

}

//响应升级提示按钮

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

    //如果选择“现在升级”

    if (buttonIndex == )

    {

        //打开iTunes  方法一

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://itunes.apple.com/cn/app/wan-zhuan-quan-cheng/id692579125?mt=8"]];

        /*

         // 打开iTunes 方法二:此方法总是提示“无法连接到itunes”，不推荐使用

         NSString *iTunesLink = @"itms-apps://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftwareUpdate?id=692579125&mt=8";

         [[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];

         */

    }

} 

#pragma mark - 辅助方法：将json 格式的原始数据转解析成数据字典

//将json 格式的原始数据转解析成数据字典

-(NSMutableDictionary *)dictionaryFromJsonFormatOriginalData:(NSString *)str

{

    SBJsonParser *sbJsonParser = [[SBJsonParser alloc]init];

    NSError *error = nil;

    //添加autorelease 解决 内存泄漏问题

    NSMutableDictionary *tempDictionary = [[[NSMutableDictionary alloc]initWithDictionary:[sbJsonParser objectWithString:str error:&error]]autorelease];

    return tempDictionary;

}