问题
Does apple allows me to change the wallpaper of the iphone from my application?
回答1:
The public iOS 4.0 API so far does not allow changing any of the iPhone wallpapers programmatically. Undocumented APIs are not supported by Apple, so no, I don't think they would allow it.
However, technically it should be possible to do so.
回答2:
Nope, no public APIs for it even with the latest SDK. You need to ask the user to save your image as a wallpaper manually.
来源：https://stackoverflow.com/questions/4057885/change-wallpaper-via-iphone-app