根據APP的BundleId從iTunes獲取版本資訊對比更新

2016年12月22日 更新：

以BundleId獲取APP資訊：https://itunes.apple.com/lookup?bundleId=你APP的Bundle ID
返回的資訊中包括版本號、trackId（即iTunes id）、更新資訊、螢幕截圖等。
使用這個介面，可以在APP一開始就部署更新機制，未上架時請求返回的資料是：

{
 "resultCount":0,
 "results": []
}

上架後可以根據results裡的version欄位值，比較後提示更新。此方法也適用於多個APP共用同一套程式碼的情況。

根據APP的id從iTunes獲取版本資訊，對比更新

{
    "resultCount": 1,
    "results": [
        {
            "artistViewUrl": "https://itunes.apple.com/cn/developer/puhui-zhongjia/id1062207165?uo=4",
            "artworkUrl60": "http://is5.mzstatic.com/image/thumb/Purple69/v4/a9/8b/0e/a98b0e82-8c0e-5fbf-a04a-939284442d1c/source/60x60bb.jpg"
 
,
            "artworkUrl100": "http://is5.mzstatic.com/image/thumb/Purple69/v4/a9/8b/0e/a98b0e82-8c0e-5fbf-a04a-939284442d1c/source/100x100bb.jpg",
            "screenshotUrls": [
                "http://a4.mzstatic.com/us/r30/Purple69/v4/ff/b9/58/ffb9584d-9bcb-8124-2772-b8d8bad3468d/screen1136x1136.jpeg",
                "http://a1.mzstatic.com/us/r30/Purple49/v4/a5/24/69/a5246911-0134-6689-c682-328ec0e1c762/screen1136x1136.jpeg"
 
,
                "http://a4.mzstatic.com/us/r30/Purple49/v4/55/3e/63/553e63ae-b0c8-08fb-08bf-3d72ebadf806/screen1136x1136.jpeg",
                "http://a3.mzstatic.com/us/r30/Purple49/v4/d1/47/6f/d1476f40-c7b2-0a90-ec39-45b44b0c15f1/screen1136x1136.jpeg"
            ],
            "ipadScreenshotUrls": [
                "http://a3.mzstatic.com/us/r30/Purple49/v4/3c/43/02/3c4302ec-71f3-db30-d6a1-fbb47f4b4a7f/screen480x480.jpeg",
                "http://a4.mzstatic.com/us/r30/Purple49/v4/e5/e8/7d/e5e87d99-481f-02dc-9181-b1dc6cb3ac2f/screen480x480.jpeg"
            ],
            "artworkUrl512": "http://is5.mzstatic.com/image/thumb/Purple69/v4/a9/8b/0e/a98b0e82-8c0e-5fbf-a04a-939284442d1c/source/512x512bb.jpg",
            "kind": "software",
            "features": [
                "iosUniversal"
            ],
            "supportedDevices": [
                "iPhone4",
                "iPad2Wifi",
                "iPad23G",
                "iPhone4S",
                "iPadThirdGen",
                "iPadThirdGen4G",
                "iPhone5",
                "iPodTouchFifthGen",
                "iPadFourthGen",
                "iPadFourthGen4G",
                "iPadMini",
                "iPadMini4G",
                "iPhone5c",
                "iPhone5s",
                "iPhone6",
                "iPhone6Plus",
                "iPodTouchSixthGen"
            ],
            "advisories": [
                "偶爾/輕度醫藥/醫療資訊",
                "無限制網頁訪問"
            ],
            "isGameCenterEnabled": false,
            "trackCensoredName": "慧眾家",
            "trackViewUrl": "https://itunes.apple.com/cn/app/hui-zhong-jia/id1062207166?mt=8&uo=4",
            "contentAdvisoryRating": "17+",
            "languageCodesISO2A": [
                "EN",
                "ZH"
            ],
            "fileSizeBytes": "20395330",
            "trackContentRating": "17+",
            "formattedPrice": "免費",
            "currency": "CNY",
            "wrapperType": "software",
            "version": "2.3.84",
            "description": "廈門普慧眾佳文化科技有限公司秉著普技能、慧生活的經營理念，引進港臺地區及國際先進的家庭服務教育思維，創立“閩臺家庭服務人才實訓基地”設有育嬰員、家政服務員、養老護理員等多個家庭服務職業工種系統性學習課程，側重於技能實操教學；首創“慧眾家”職業教育線上學習平臺，主要包含網上註冊報名；課程管理；整合多種格式的知識、資訊資源；學習評估、結果跟蹤、生成學習報告等功能；通過BBS，實訓基地面授培訓等方式提供學員與學員、學員與講師間的互動溝通渠道；旨在傳遞，跟蹤，報告和管理學習內容，掌握學習進度，提高學習效率，力求學以致用；專注於培養家庭服務業實用性人才，推動行業標準化建設與服務的健康發展！",
            "artistId": 1062207165,
            "artistName": "puhui zhongjia",
            "genres": [
                "教育"
            ],
            "price": 0,
            "trackName": "慧眾家",
            "trackId": 1062207166,
            "bundleId": "com.PHZJ.htlhzj",
            "releaseDate": "2016-01-07T23:16:40Z",
            "primaryGenreName": "Education",
            "primaryGenreId": 6017,
            "isVppDeviceBasedLicensingEnabled": true,
            "releaseNotes": "新增培訓課程，記錄您的學習進度，下次學過的內容再也不用重頭再看一遍啦！",
            "currentVersionReleaseDate": "2016-02-02T02:38:09Z",
            "sellerName": "puhui zhongjia",
            "genreIds": [
                "6017"
            ],
            "minimumOsVersion": "7.0"
        }
    ]
}