iOS 检查更新

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）：

{
    resultCount = 1;
    results =     (
                {
            advisories =             (
            );
            appletvScreenshotUrls =             (
            );
            artistId = 1165823318;
            artistName = "***";
            artistViewUrl = "https://itunes.apple.com/us/developer/***/id1165823318?uo=4";
            artworkUrl100 = "http://is2.mzstatic.com/image/thumb/Purple122/v4/77/9b/b2/779bb2af-25ea-405b-23b8-1759617d5b82/source/100x100bb.jpg";
            artworkUrl512 = "http://is2.mzstatic.com/image/thumb/Purple122/v4/77/9b/b2/779bb2af-25ea-405b-23b8-1759617d5b82/source/512x512bb.jpg";
            artworkUrl60 = "http://is2.mzstatic.com/image/thumb/Purple122/v4/77/9b/b2/779bb2af-25ea-405b-23b8-1759617d5b82/source/60x60bb.jpg";
            bundleId = "com.YangtzeUniversity.OilGas";
            contentAdvisoryRating = "4+";
            currency = USD;
            currentVersionReleaseDate = "2017-01-17T20:34:50Z";
            description = "\U83b7\U53d6\U6700\U65b0\U6cb9\U6c14\U884c\U4e1a\U8d44\U8baf\U4fe1\U606f\U3002";
            features =             (
                iosUniversal
            );
            fileSizeBytes = 9250816;
            formattedPrice = Free;
            genreIds =             (
                6009,
                6002
            );
            genres =             (
                News,
                Utilities
            );
            ipadScreenshotUrls =             (
                "http://a1.mzstatic.com/us/r30/Purple111/v4/7b/3d/34/7b3d3438-7851-8757-7430-b9e9c2866c38/sc1024x768.jpeg",
                "http://a1.mzstatic.com/us/r30/Purple111/v4/a2/06/0a/a2060a38-bf91-edcd-a753-1dd6643a3cc4/sc1024x768.jpeg",
                "http://a4.mzstatic.com/us/r30/Purple111/v4/0e/08/e9/0e08e988-d000-1642-21ef-b02cb90bcdc3/sc1024x768.jpeg",
                "http://a5.mzstatic.com/us/r30/Purple111/v4/00/fa/43/00fa43dc-e04c-87d8-b68e-a0867895d95e/sc1024x768.jpeg"
            );
            isGameCenterEnabled = 0;
            isVppDeviceBasedLicensingEnabled = 1;
            kind = software;
            languageCodesISO2A =             (
                EN,
                ZH
            );
            minimumOsVersion = "7.0";
            price = 0;
            primaryGenreId = 6009;
            primaryGenreName = News;
            releaseDate = "2016-11-16T19:38:28Z";
            releaseNotes = "-\U65b0\U589e\U5728\U5bfc\U822a\U680f\U63d0\U793a\U65b0\U6536\U5230\U7684\U901a\U77e5\U529f\U80fd\Uff1b\n-\U4fee\U590d\U4e0d\U63d0\U793a\U65b0\U804a\U5929\U6d88\U606f\U7684\U95ee\U9898\Uff1b\n-\U4fee\U590d\U65b0\U5efa\U901a\U77e5\U9009\U62e9\U8054\U7cfb\U4eba\U65f6\U53ef\U80fd\U5bfc\U81f4\U8282\U9762\U5361\U987f\U7684\U95ee\U9898\U3002";
            screenshotUrls =             (
                "http://a3.mzstatic.com/us/r30/Purple111/v4/28/7c/7e/287c7ec6-b5d9-d686-dc42-8a603118be4a/screen696x696.jpeg",
                "http://a5.mzstatic.com/us/r30/Purple111/v4/40/8b/c4/408bc4bd-6f00-6fa3-26ab-21df7a94e540/screen696x696.jpeg",
                "http://a2.mzstatic.com/us/r30/Purple122/v4/55/f8/f7/55f8f76e-2f11-4dc7-6120-0c8508213686/screen696x696.jpeg",
                "http://a4.mzstatic.com/us/r30/Purple111/v4/16/8c/95/168c9565-8baf-ba6e-eb4c-f7fd7da3ada8/screen696x696.jpeg",
                "http://a5.mzstatic.com/us/r30/Purple111/v4/5c/3c/88/5c3c8812-a9dd-de09-7381-1d5a6192bdaa/screen696x696.jpeg"
            );
            sellerName = "***";
            supportedDevices =             (
                iPhone4,
                iPad2Wifi,
                iPad23G,
                iPhone4S,
                iPadThirdGen,
                iPadThirdGen4G,
                iPhone5,
                iPodTouchFifthGen,
                iPadFourthGen,
                iPadFourthGen4G,
                iPadMini,
                iPadMini4G,
                iPhone5c,
                iPhone5s,
                iPhone6,
                iPhone6Plus,
                iPodTouchSixthGen
            );
            trackCensoredName = "\U6cb9\U8baf\U901a";
            trackContentRating = "4+";
            trackId = 1165823319;
            trackName = "\U6cb9\U8baf\U901a";
            trackViewUrl = "https://itunes.apple.com/us/app/you-xun-tong/id1165823319?mt=8&uo=4";
            version = "1.5";
            wrapperType = software;
        }
    );
}

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

</br>

最终效果：

</br>

附：完整代码

//检查是否有版本更新
+(void)checkForUpdate:(void(^)(void))finishBlock{
    NSString *curVersion=[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
    NSArray *curVersionArr=[curVersion componentsSeparatedByString:@"."];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    //id后面的参数为你的应用程序的ID，此处“1234567890”为实例数据
    [manager POST:@"http://itunes.apple.com/lookup?id=1234567890" parameters:nil success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
        BOOL hasNewVersion=false;
        NSArray *array = responseObject[@"results"];
        NSDictionary *dict = [array lastObject];
        NSString *serverVersion=dict[@"version"];
        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 (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{
            //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;
                }
            }
        }
        if (hasNewVersion) {
            //存在新版本，提示用户更新
            finishBlock();
        }
    } failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
    }];
}