I want to write a parental control app where I will set the screen lock time & screen unlock time. Once that time reached the screen will be automatically locked & it will unlock automatically at the unlock time I set. I have searched in various places and forums but everybody is telling that it is not possible to lock the screen in iOS since Apple will reject the app if we upload that to App Store. But it is strange that there is an app(Parental Timelock) in iOS which basically locks the screen of iOS. https://itunes.apple.com/in/app/parental-timelock-time-limit/id689577280?mt=8 Any one knows how to handle the screen lock?

That app doesn't lock the screen. Have you read the reviews, of this app. I don't even understand what it does do

I have used the app and it is locking the screen after certain timer expires. It is a nice app to control my child while going for bed since she is playing with my ipad everytime.

The app locks the screen and restricts access to apps via a Configuration Profile. http://nshipster.com/configuration-profiles/ -- Niraj

Thanks for the information.