When iPhone rings, the running application will quit until the phone call ends. So in code level, how could we handle this situation.

I found a post by Norman McEntire and he talked about the application behavior when the phone rings. Here is what he found.

 

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Question: Does the sample app that we wrote run in the background when the phone rings?
 

Answer: I installed the app on my iPhone, then had my brother call the iPhone while I was watching the messages in the console. The moment the phone rang, the message received was this:

applicationWillResignActive:

As the phone continued to ring, the background counter continued to count. However, the moment I answered the phone, the message received was this:

applicationWillTerminate:

In summary, the application does not terminate when the phone rings, but it did terminate the moment I answered the phone. Also, when I hung up the phone, the application started back up.

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Done =)

Reference:

• iPhone Programming Presentation to SDSIC: 2009-04-02: Follow Up Question/Answers by Norman McEntire
• UIApplicationDelegate Protocol Reference