I'm building an app which would have to have the ability to show my own views on the iPhone lock screen. I've seen lots of apps which let you customize the lockscreen and so forth and these were App Store apps so i'm guessing it has to possible.
I just can't figure out what to use in the iOS SDK to even try implementing this.
Oh and P.S: same goes for wallpapers—can we change this from inside our app?
It can be changed programmatically (change to SpringBoard), but it won't make the way to the (official) AppStore. So if you want to build an app that can change something like the lock screen wallpaper or the ring tone which you usually need the Settings app for, you have to publish your application via Cydia, not Apple's store.
For a sample code block, see this answer.
来源：https://stackoverflow.com/questions/6243591/programmatically-changing-the-ios-lock-screen