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I am developing an app where I need to created a that will scroll at the speed provided by a UISlider presented to the end user.I will provide the end user with a range of numbers form 0 to 100. These numbers will represent inches per minute for speed.The UIScrollview will be different sizes for each user depending on the content they provide. The speed of the scrolling needs to be consistent no matter the size of the UIScroll View.Can someone please tell me how this can be accomplished.

I have been using iCade game controller with my app using the code form an iCade-iOS build on GitHub. After updating to iOS 11 my ios devices can sync with the remote control, but there is now functional. Before the update, the phone / iPad would see the controller as a keyboard and the code I have been using finds the keystrokes and turns them into usable commands for gaming etc.. After the update pushing the buttons on the controller does nothing.Did apple remove support for iCade style game controllers in iOS 11 and if so what alternative is there to get it working again?