You are writing an application that plays audio files (such as a music player) and you would like the audio files to be played even if your application is running in the background.
Create a new array key in your application’s main .plist file. Set the name of the key to
UIBackgroundModes. Add the value
audio to this new key. Here is an
example of the contents of a .plist file with the aforementioned key and
<dict> ... ... ... <key>UIBackgroundModes</key> <array> <string>audio</string> </array> ... ... ... </dict>
Now you can use the AV Foundation to play audio files, and your audio files will be played even if your application is in the background.
In iOS, applications can request that their audio files continue
playing even if the application
is sent to the background. AV Foundation’s
AVAudioPlayer is an easy-to-use audio player that we will
use in this recipe. Our mission is to start an audio player and play a
simple song, and while the song is playing, send the application to
the background by pressing the Home
button. If we have included the
Modes key in our
application’s .plist file, iOS
will continue playing the music from our app’s audio player, even in
the background. While in the background, we should only play music and
provide our music player with the data that is necessary for it to
run. We should not be performing any other tasks, such as displaying
Here is the .h file ...