Get a list of installed apps in an App Store approved application

Question

I've come across this app , which as one of the functionalities, can scan your phone to retrieve a list of installed apps. I have read the thread on SO here concerning retrieving a list of installed apps by accessing private folders, private APIs, etc. but the answers only apply to jailbroken/sandbox-free applications, which can't be put on the App Store. But this app has been approved and is available now on the store.

How is it that they are retrieving a list of the users installed applications without the use of private APIs?

Answer 1

经过进一步分析，我发现它们本身并不是在检索每个已安装应用程序的列表，而是它们很可能在已知流行应用程序URL的数据库中循环（在该应用程序中，有17,000个url，可能是从服务器），方法是为每个URL重复调用[[UIApplication sharedApplication] canOpenURL:url] ，并在返回YES时将其添加到数组中。