[iOS]如何向 appstore 查询已发布 APP 的信息？

[iOS]如何向 appstore 查询已发布 APP 的信息？

分类： Cocoa 开发2011-07-14
15:40 1201人阅读 评论(1) 收藏 举报

如果我们需要实现版本的 app 自动更新，那么我们需要获取当前运行程序的版本信息和 appstore 里发布的最新版本信息。

当前运行程序的版本信息，可以在 mainBundle 里面获取：

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

NSString *currentVersion = [infoDict objectForKey:@"CFBundleVersion"];

而 appstore 里发布的最新版本信息获取稍微复杂一些，有两种方案，思路都是一样的：

其一：在某个服务器上存储最新发布的版本信息，需要的时候向该服务器查询；

其二：在需要的时候向 appstore 查询；

在这里我来介绍第二种方法：向 appstore 查询应用程序信息，包括作者，版本，app 介绍页面地址等信息。

英文好的同学可以参考 apple 的文档：www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html

具体步骤如下：

1，用 POST 方式发送请求：
http://itunes.apple.com/search?term=你的应用程序名称&entity=software
更加精准的做法是根据 app 的 id 来查找：
http://itunes.apple.com/lookup?id=你的应用程序的ID
2，从获得的 response 数据中解析需要的数据。因为从 appstore 查询得到的信息是 JSON 格式的，所以需要经过解析。解析之后得到的原始数据就是如下这个样子的：

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{

resultCount = 1;

results = (

{

artistId = 301724683;

artistName = Citibank;

artistViewUrl = "http://itunes.apple.com/us/artist/citibank/id301724683?uo=4";

artworkUrl100 = "http://a5.mzstatic.com/us/r1000/117/Purple/a1/85/a9/mzl.hvwnfdkw.png";

artworkUrl512 = "http://a5.mzstatic.com/us/r1000/117/Purple/a1/85/a9/mzl.hvwnfdkw.png";

artworkUrl60 = "http://a2.mzstatic.com/us/r1000/099/Purple/67/86/7e/mzi.utfdvrgy.png";

averageUserRating = "3.5";

averageUserRatingForCurrentVersion = 5;

contentAdvisoryRating = "4+";

currency = USD;

description = "Description of you app.";

features = (

iosUniversal

);

fileSizeBytes = 4141195;

genreIds = (

6015

);

genres = (

Finance

);

ipadScreenshotUrls = (

"http://a1.mzstatic.com/us/r1000/095/Purple/e0/a6/17/mzl.pbbxcjzt.1024x1024-65.jpg",

"http://a3.mzstatic.com/us/r1000/036/Purple/cc/14/98/mzl.dyairego.1024x1024-65.jpg"

);

isGameCenterEnabled = 0;

kind = software;

languageCodesISO2A = (

EN

);

price = 0;

primaryGenreId = 6015;

primaryGenreName = Finance;

releaseDate = "2011-01-24T06:14:35Z";

releaseNotes = "* View Real-time streaming prices for U.S. Treasuries \n\n* Open and Save your Citi Research in your favorite PDF Reader and Library such as iBooks\n\n* Search for your favorite videos";

screenshotUrls = (

"http://a3.mzstatic.com/us/r1000/066/Purple/17/51/fb/mzl.zywiavgn.png",

"http://a5.mzstatic.com/us/r1000/026/Purple/73/85/97/mzl.csmdtndk.png"

);

sellerName = "Citibank, N.A.";

sellerUrl = "http://";

supportedDevices = (

all

);

trackCensoredName = "Citi Velocity";

trackContentRating = "4+";

trackId = 414697122;

trackName = "Citi Velocity";

trackViewUrl = "http://itunes.apple.com/us/app/citi-velocity/id414697122?mt=8&uo=4";

userRatingCount = 5;

userRatingCountForCurrentVersion = 1;

version = "1.4";

wrapperType = software;

}

);

}

然后从中取得 results 数组即可，具体代码如下所示：

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NSDictionary *jsonData = [dataPayload JSONValue];

NSArray *infoArray = [jsonData objectForKey:@"results"];

NSDictionary *releaseInfo = [infoArray objectAtIndex:0];

NSString *latestVersion = [releaseInfo objectForKey:@"version"];

NSString *trackViewUrl = [releaseInfo objectForKey:@"trackViewUrl"];

如果你拷贝 trackViewUrl 的实际地址，然后在浏览器中打开，就会打开你的应用程序在 appstore 中的介绍页面。当然我们也可以在代码中调用 safari 来打开它。

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UIApplication *application = [UIApplication sharedApplication];

[application openURL:[NSURL URLWithString:trackViewUrl]];