如何以编程方式检查是否安装了应用程序？

问题描述：

我正在开发一个iPhone应用程序，它将在企业中安装很少的第三方应用程序。我有关于捆绑ID的信息。有没有办法使用某些系统API检查应用程序是否已安装？目前，应用程序再次安装，覆盖当前安装。我需要防止这种情况。（如果已经安装了应用程序，Apple的AppStore应用程序将禁用安装选项。）

I am developing an iPhone application which will install few third party applications in an enterprise. I have the information about the bundle IDs. Is there a way to check if the application is already installed, using some system APIs? Currently the application gets installed again, overwriting the current installation. I need to prevent this some how. (Apple's AppStore application disables the installation option if the app is already installed.)

答

我认为这不可能直接，但是如果应用程序注册uri方案，您可以测试它。

I think this is not possible directly, but if the apps register uri schemes you could test for that.

URI方案例如是 fb：// 对于Facebook应用程序。您可以在应用的info.plist中注册。 [UIApplication canOpenURL：url] 会告诉您某个网址是否会打开。因此测试 fb：// 是否会打开，将表明安装了一个已注册的应用 fb：// - 这是Facebook应用程序的一个很好的提示。

A URI scheme is for example fb:// for the facebook app. You can register that in the info.plist of your app. [UIApplication canOpenURL:url] will tell you if a certain url will or will not open. So testing if fb:// will open, will indicate that there is an app installed which registered fb:// - which is a good hint for the facebook app.

// check whether facebook is (likely to be) installed or not
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]) {
    // Safe to launch the facebook app
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"fb://profile/200538917420"]];
}

如何以编程方式检查是否安装了应用程序？

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