通常我们在做App版本检查更新功能的时候，都是后台服务器为我们提供一个获取App最新版本信息的接口，并且在每次新版本更新后，都需要人工在后台更改版本信息，费事且不及时。
其实苹果提供了一个很友好的iTunes接口，供我们获取App Store中App当前的最新信息。
接口：
http://itunes.apple.com/lookup?id=xxx
xxx换成相应App的AppId，例如微信的AppId为414478124，那么完整的url就是：http://itunes.apple.com/lookup?id=414478124
拿微信举例，通过接口获取到的数据如下：
{
"resultCount": 1,
"results": [{
"artistViewUrl": "https://itunes.apple.com/us/developer/wechat/id614694882?uo=4",
"artworkUrl60": "https://is4-ssl.mzstatic.com/image/thumb/Purple115/v4/f1/2a/44/f12a44d4-86be-1902-8a3b-cc7d18f5cd6a/source/60x60bb.jpg",
"artworkUrl100": "https://is4-ssl.mzstatic.com/image/thumb/Purple115/v4/f1/2a/44/f12a44d4-86be-1902-8a3b-cc7d18f5cd6a/source/100x100bb.jpg",
"screenshotUrls": [ "https://is1-ssl.mzstatic.com/image/thumb/Purple128/v4/bd/07/e9/bd07e908-249a-1cb2-bd3e-bc2f8c96a554/source/392x696bb.jpg",
"https://is5-ssl.mzstatic.com/image/thumb/Purple118/v4/e7/14/fc/e714fc29-db02-b3d3-dfb0-bb3543f33ca4/source/392x696bb.jpg",
"https://is5-ssl.mzstatic.com/image/thumb/Purple118/v4/fc/92/5a/fc925aea-d755-8c15-bae0-0f07cc0c13ea/source/392x696bb.jpg",
"https://is5-ssl.mzstatic.com/image/thumb/Purple118/v4/ca/b5/3e/cab53e72-a6b7-e39c-4e34-6d76384d073d/source/392x696bb.jpg",
"https://is2-ssl.mzstatic.com/image/thumb/Purple118/v4/43/f3/9d/43f39d80-a30b-32a6-37bc-d2aee81142d1/source/392x696bb.jpg" ],
"ipadScreenshotUrls": [ "https://is4-ssl.mzstatic.com/image/thumb/Purple128/v4/a1/7e/20/a17e20b4-5725-d926-33d2-9e5f46128690/source/576x768bb.jpg",
"https://is2-ssl.mzstatic.com/image/thumb/Purple118/v4/b5/f0/4f/b5f04f8f-f5c8-0f05-5406-72c0dfd2a99c/source/576x768bb.jpg",
"https://is5-ssl.mzstatic.com/image/thumb/Purple118/v4/71/da/c6/71dac6a1-a506-b3f4-abe2-849831eccf92/source/576x768bb.jpg",
"https://is5-ssl.mzstatic.com/image/thumb/Purple128/v4/bc/0d/7e/bc0d7ea5-bb31-47ed-9284-48c61775a50a/source/576x768bb.jpg" ],
"appletvScreenshotUrls": [],
"artworkUrl512": "https://is4-ssl.mzstatic.com/image/thumb/Purple115/v4/f1/2a/44/f12a44d4-86be-1902-8a3b-cc7d18f5cd6a/source/512x512bb.jpg",
"isGameCenterEnabled": false,
"kind": "software",
"features": [ "iosUniversal" ],
"supportedDevices": [ "iPad2Wifi-iPad2Wifi",
"iPad23G-iPad23G",
"iPhone4S-iPhone4S",
"iPadThirdGen-iPadThirdGen",
"iPadThirdGen4G-iPadThirdGen4G",
"iPhone5-iPhone5",
"iPodTouchFifthGen-iPodTouchFifthGen",
"iPadFourthGen-iPadFourthGen",
"iPadFourthGen4G-iPadFourthGen4G",
"iPadMini-iPadMini",
"iPadMini4G-iPadMini4G",
"iPhone5c-iPhone5c",
"iPhone5s-iPhone5s",
"iPadAir-iPadAir",
"iPadAirCellular-iPadAirCellular",
"iPadMiniRetina-iPadMiniRetina",
"iPadMiniRetinaCellular-iPadMiniRetinaCellular",
"iPhone6-iPhone6",
"iPhone6Plus-iPhone6Plus",
"iPadAir2-iPadAir2",
"iPadAir2Cellular-iPadAir2Cellular",
"iPadMini3-iPadMini3",
"iPadMini3Cellular-iPadMini3Cellular",
"iPodTouchSixthGen-iPodTouchSixthGen",
"iPhone6s-iPhone6s",
"iPhone6sPlus-iPhone6sPlus",
"iPadMini4-iPadMini4",
"iPadMini4Cellular-iPadMini4Cellular",
"iPadPro-iPadPro",
"iPadProCellular-iPadProCellular",
"iPadPro97-iPadPro97",
"iPadPro97Cellular-iPadPro97Cellular",
"iPhoneSE-iPhoneSE",
"iPhone7-iPhone7",
"iPhone7Plus-iPhone7Plus",
"iPad611-iPad611",
"iPad612-iPad612",
"iPad71-iPad71",
"iPad72-iPad72",
"iPad73-iPad73",
"iPad74-iPad74",
"iPhone8-iPhone8",
"iPhone8Plus-iPhone8Plus",
"iPhoneX-iPhoneX" ],
"advisories": [ "Infrequent/Mild Sexual Content and Nudity" ],
"trackCensoredName": "WeChat",
"trackViewUrl": "https://itunes.apple.com/us/app/wechat/id414478124?mt=8&uo=4",
"contentAdvisoryRating": "12+",
"averageUserRatingForCurrentVersion": 4,
"languageCodesISO2A": [ "AR",
"ZH",
"EN",
"FR",
"DE",
"ID",
"IT",
"JA",
"KO",
"MS",
"PT",
"RU",
"ZH",
"ES",
"TH",
"ZH",
"TR",
"VI" ],
"fileSizeBytes": "255824896",
"sellerUrl": "http://www.wechat.com",
"userRatingCountForCurrentVersion": 135,
"trackContentRating": "12+",
"primaryGenreName": "Social Networking",
"primaryGenreId": 6005,
"releaseNotes": "Latest Updates:\n- Hide articles or webpages and expand them later to view again\n\nRecent Updates:\n- Save a Moments post as a draft for later editing",
"releaseDate": "2011-01-21T01:32:15Z",
"currency": "USD",
"wrapperType": "software",
"version": "6.6.7",
"artistId": 614694882,
"artistName": "WeChat",
"genres": [ "Social Networking",
"Productivity" ],
"price": 0,
"description": "WeChat is a messaging and calling app that allows you to easily connect with family & friends across countries. It's the all-in-one communications app for text (SMS/MMS), voice and video calls, Moments, photo sharing, and games.\n\nWHY USE WECHAT:\n• MULTIMEDIA MESSAGING: Send video, image, text, and voice messages.\n• GROUP CHAT & CALLS: Create group chats with up to 500 people and group video calls up to 9 people. \n• FREE VOICE & VIDEO CALLS: High-quality free calls to anywhere in the world.\n• WECHAT OUT CALLS: Make calls to landlines and mobile around the globe at low rates (in certain regions only).\n• STICKER GALLERY: Hundreds of free, fun, animated stickers to express your feelings from some of your favorite cartoons and movies.\n• MOMENTS: Share your best moments on your personal photo stream.\n• BETTER PRIVACY: WeChat gives you the highest level of control over your privacy. It's the only messaging app to be certified by TRUSTe.\n• MEET NEW FRIENDS: Use “Friend Radar”, “People Nearby” and “Shake” to meet others. \n• REALTIME LOCATION: Instead of having to tell others where you are, just use real-time location sharing.\n• LANGUAGE SUPPORT: Localized in 20 different languages and can translate messages to any language.\n• WeRun-WeChat: Access HealthKit data and challenge friends to beat their scores via the "WeRun-WeChat" Official Account.\n• AND MORE: Desktop app, custom wallpapers, custom notifications, and Official Accounts.",
"bundleId": "com.tencent.xin",
"formattedPrice": "Free",
"isVppDeviceBasedLicensingEnabled": true,
"genreIds": [ "6005",
"6007" ],
"currentVersionReleaseDate": "2018-05-23T09:59:42Z",
"sellerName": "Tencent Technology (Shenzhen) Company Limited",
"minimumOsVersion": "8.0",
"trackId": 414478124,
"trackName": "WeChat",
"averageUserRating": 4.5,
"userRatingCount": 77410
}]
}
通过上面的内容可以看出，接口返回的信息很详细，我们挑一些有用的截取出来：
{
"resultCount" : 1,
"results" : [{
"artistId" : "开发者 ID",
"artistName" : "开发者名称",
"trackCensoredName" : "审查名称",
"trackContentRating" : "评级",
"trackId" : "应用程序 ID",
"trackName" = "应用程序名称",
"trackViewUrl" = "应用程序下载网址",
"userRatingCount" = "用户评论数量",
"userRatingCountForCurrentVersion" = "当前版本的用户评论数量",
"version" = "版本号",
"releaseNotes"="更新内容"
"description"="应用介绍"
}]
}
检查App版本更新功能完整实现：
/// 检查版本更新
- (void)checkVersion {
NSURL * url = [NSURL URLWithString:@"http://itunes.apple.com/lookup?id=414478124"];
[[[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSDictionary * dataDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
NSArray *results = dataDic[@"results"];
if (results && results.count > 0) {
NSDictionary *response = results.firstObject;
NSString *currentVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"]; // 软件的当前版本
NSString *lastestVersion = response[@"version"]; // AppStore 上软件的最新版本
if (currentVersion && lastestVersion && ![self isLastestVersion:currentVersion compare:lastestVersion]) {
NSString * releaseNotes = response[@"releaseNotes"]; // 新版本更新内容
NSString * alertContent = [NSString stringWithFormat:@"%@\n\n是否前往 AppStore 更新版本？",releaseNotes];
// 给出提示是否前往 AppStore 更新
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"检测到有版本更新" message:alertContent preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"前往" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
NSString *trackViewUrl = response[@"trackViewUrl"]; // AppStore 上软件的地址
if (trackViewUrl) {
NSURL *appStoreURL = [NSURL URLWithString:trackViewUrl];
if ([[UIApplication sharedApplication] canOpenURL:appStoreURL]) {
[[UIApplication sharedApplication] openURL:appStoreURL];
}
}
}]];
[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
[[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alert animated:YES completion:nil];
}
}
}] resume];
}
/// 判断是否最新版本号（大于或等于为最新）
- (BOOL)isLastestVersion:(NSString *)currentVersion compare:(NSString *)lastestVersion {
if (currentVersion && lastestVersion) {
// 拆分成数组
NSMutableArray *currentItems = [[currentVersion componentsSeparatedByString:@"."] mutableCopy];
NSMutableArray *lastestItems = [[lastestVersion componentsSeparatedByString:@"."] mutableCopy];
// 如果数量不一样补0
NSInteger currentCount = currentItems.count;
NSInteger lastestCount = lastestItems.count;
if (currentCount != lastestCount) {
NSInteger count = labs(currentCount - lastestCount); // 取绝对值
for (int i = 0; i < count; ++i) {
if (currentCount > lastestCount) {
[lastestItems addObject:@"0"];
} else {
[currentItems addObject:@"0"];
}
}
}
// 依次比较
BOOL isLastest = YES;
for (int i = 0; i < currentItems.count; ++i) {
NSString *currentItem = currentItems[i];
NSString *lastestItem = lastestItems[i];
if (currentItem.integerValue != lastestItem.integerValue) {
isLastest = currentItem.integerValue > lastestItem.integerValue;
break;
}
}
return isLastest;
}
return NO;
}
参考：[http://www.coolketang.com/staticIOS/5b0953b4ac502e0062c27f31.html]