xcode - Pan not working in Swift 3 -

i trying make set of views draggable. dragged pan gesture recognizer view called apps. current code doesn't work.

@ibaction func moveapp(_ sender: uipangesturerecognizer) {         let translation = sender.translation(in: self.view)         sender.view!.center = cgpoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)         sender.settranslation(cgpoint.zero, in: self.view) } 

views

you should replace code in ibaction method following code. worked me.

@ibaction func moveapp(_ sender: uipangesturerecognizer) {         let point = sender.location(in: view)         sender.view?.center = point     }