Provide API to set the Lock Screen wallpaper image

Originator:bst
Number:rdar://49599250 Date Originated:4/4/2019
Status:DUPLICATE OF 30318066 Resolved:
Product:iOS + SDK Product Version:iOS 12.1
Classification:Suggestion Reproducible:n/a
 
Area: Lock Screen

I have an app which allows the user to design a wallpaper image for use on the lock screen (or home screen if they choose). In descending order of desirability I would like to do one of these operations:

1) Use an API to directly set an image as the Lock Screen from my app

2) Do what the Photos app does to achieve this: add a "Use as Wallpaper" UIActivity to my app

3) Open the system Settings directly into the Wallpaper settings section

4) Open the system Settings at its root level -- not in my app's settings section (as UIApplicationOpenSettingsURLString does).

Or to put it more generally, do *something* better than telling my users: "Now open Settings, go to Wallpaper, tap Choose a New Wallpaper, select the last image in the camera roll, tap Set and then Set Lock Screen". Which is a lot of steps.

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