//检查新版本 更新

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, ), ^{

        // 耗时的操作

        //获取本地版本号

        NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];

        NSString *version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];

        NSString *build = [infoDictionary objectForKey:@"CFBundleVersion"];

        NSString *nowVersion = [NSString stringWithFormat:@"%@.%@", version, build];

        //获取appStore网络版本号

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://itunes.apple.com/lookup?id=%@", @""]];

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

        NSRange substr = [file rangeOfString:@"\"version\":\""];

        NSRange range1 = NSMakeRange(substr.location+substr.length,);

        //    NSRange substr2 =[file rangeOfString:@"\"" options:nil range:range1];

        NSRange substr2 = [file rangeOfString:@"\"" options:NSCaseInsensitiveSearch  range:range1];

        NSRange range2 = NSMakeRange(substr.location+substr.length, substr2.location-substr.location-substr.length);

        NSString *appStoreVersion =[file substringWithRange:range2];

        dispatch_async(dispatch_get_main_queue(), ^{

            // 更新界面

            //如果不一样去更新

            if(![nowVersion isEqualToString:appStoreVersion])

            {

                [self showAlert];

            }

        });

    });

/**

 *  检查新版本更新

 */

-(void)showAlert

{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"有新的版本啦~~" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"前去更新",nil];

    [alert show];

}

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

{

    if(buttonIndex==)

    {

        // 此处加入应用在app store的地址，方便用户去更新，一种实现方式如下：

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://itunes.apple.com/us/app/id%@?ls=1&mt=8", @""]];

        [[UIApplication sharedApplication] openURL:url];

    }

}

// 获取appStore版本号

NSString *url = [[NSString alloc] initWithFormat:@"http://itunes.apple.com/lookup?id=%@",@""];  

[self Postpath:url];  

#pragma mark -- 获取数据

-(void)Postpath:(NSString *)path

{  

    NSURL *url = [NSURL URLWithString:path];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url

                                                           cachePolicy:NSURLRequestReloadIgnoringCacheData

                                                       timeoutInterval:];  

    [request setHTTPMethod:@"POST"];  

    NSOperationQueue *queue = [NSOperationQueue new];  

    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response,NSData *data,NSError *error){

        NSMutableDictionary *receiveStatusDic=[[NSMutableDictionary alloc]init];

        if (data) {  

            NSDictionary *receiveDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];

            if ([[receiveDic valueForKey:@"resultCount"] intValue]>) {  

                [receiveStatusDic setValue:@"" forKey:@"status"];

                [receiveStatusDic setValue:[[[receiveDic valueForKey:@"results"] objectAtIndex:] valueForKey:@"version"]   forKey:@"version"];

            }else{  

                [receiveStatusDic setValue:@"-1" forKey:@"status"];

            }

        }else{

            [receiveStatusDic setValue:@"-1" forKey:@"status"];

        }  

        [self performSelectorOnMainThread:@selector(receiveData:) withObject:receiveStatusDic waitUntilDone:NO];

    }];  

}  

-(void)receiveData:(id)sender

{

    NSLog(@"receiveData=%@",sender);  

}  

最后打印出来的字典中就包含 版本号

receiveData={

    status = ;

    version = "1.0.0";

}