Add image on lock screen in iOS app, when app is running in background

Question

There are many question on site like

Programatically changing the iOS lock-screen ,

How to set lock screen , wallpaper and Ringtone programmatically in iPhone? All say that apple will reject if we modify the lock-Screen image.

But I seen it in many apps. Example Saavn is in AppStore.

In this if a song is playing and device is locked, It shows the image of the current album on the lock screen.

Please share if anybody know how it can be done. Thanks.

Whitmore

Answer 1

Music apps can change the lock screen wallpaper because iOS automatically displays the album artwork for the song/podcast/etc that's playing (see MPMusicPlayerController docs). As far as I know, it's not an API that's publicly available to developers.

Bricebriceno

Answer 2

The "podcaster" app (3rd party not apple) displays an image of the currently playing podcast. Podcast images are stored in the RSS feed and not in each mp3 so the app is dynamically telling the os which image goes with with mp3. Of course you can play "silence" out of the speaker but I don't think this is a clean solution

Heave

apple won't approve an app that plays "silence" – Hanghangar

If your app needs to tell the user of events you could get away with playing silence mixed with helpful notification sounds. This is sort of a hacked replacement for push but apple might approve it – Heave

Hell, play elevator music when they lock the app. Lol! – Heave

We all need ASMR all the time. An ASMR Reminder/to-do/motivational app! :) – Randell