当我的应用程序的音频开始播放时，如何关闭另一个应用程序的音频？

Question

So, I need two things:

1. When my app starts, and another app's audio is already playing, I don't want to stop that other app's audio.

2. When my app's audio starts playing (the user initiates this action) I want any other app's audio that may be currently playing to stop.

I've already accomplished #1, but need some help figuring out #2.

Here's the code I have in my App Delegate applicationDidFinishLaunchingWithOptions method that makes #1 work:

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback 
                                 withOptions:AVAudioSessionCategoryOptionMixWithOthers 
                                       error:nil];

Answer 1

So, the key was to set the options to 0 when I actually started playing the audio in my app with a category of AVAudioSessionCategoryPlayback. If you just don't specify the options when you change the category, it seems to assume that you want to use the originally specified options. That's my guess anyway.

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback 
                                 withOptions:0 
                                       error:nil];