How do iphone apps know about other apps?_问答_开发者

How do iphone apps know about other apps?

开发者 https://www.devze.com 2023-02-18 19:45 出处：网络

I recently downloaded an app (Overkill) and they have an in game \"virtual currency\"called \"overkill medals\" or \"OM\". You can use the in-app purchase system to buy more OM, or you can earn it, th

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I recently downloaded an app (Overkill) and they have an in game "virtual currency" called "overkill medals" or "OM". You can use the in-app purchase system to buy more OM, or you can earn it, through their service called "Tapjoy."

Tapjoy (inside the Overkill app) brings up a menu with eligible apps, and a link to the iTunes store to download it and requires you to "download and open" the app in order to earn your OM.

How does this app know that I have downloaded and opened the app, in order to award me the OM?开发者_开发知识库

Edit: It also seems to know when I had the app already

The app is likely checking to see if another app has registered a custom URL scheme, by calling UIApplication canOpenURL, against a list of known schemes dolled out by Tapjoy to each implementor.

The isn't anything within the Apple's iOS SDK that would allow this, so in all likelihood each of these apps is registering with a web service. The server is tracking installation and use of the various apps by relating the unique device id.