UIScrollView pauses NSTimer until scrolling finishes

For anyone using Swift 3

timer = Timer.scheduledTimer(timeInterval: 0.1,
                            target: self,
                            selector: aSelector,
                            userInfo: nil,
                            repeats: true)


RunLoop.main.add(timer, forMode: RunLoopMode.commonModes)

An easy & simple to implement solution is to do:

NSTimer *timer = [NSTimer timerWithTimeInterval:... 
                                         target:...
                                       selector:....
                                       userInfo:...
                                        repeats:...];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];