UIViewExtension.swift

import UIKit

extension UIView {
    
    func scrollToY(y: CGFloat) {
        scrollToY(y, velocity: 0.25)
    }
    
    func scrollToView(view: UIView) {
        scrollToView(view, velocity: 0.25)
    }
    
    func scrollElement(view: UIView, toPoint y: CGFloat) {
        scrollElement(view, toPoint: y, velocity: 0.25)
    }
    
    func scrollToY(y: CGFloat, velocity: NSTimeInterval) {
        UIView.animateWithDuration(velocity, animations: { () -> Void in
            self.transform = CGAffineTransformMakeTranslation(0, y)
        })
    }
    
    func scrollToView(view: UIView, velocity: NSTimeInterval) {
        let theFrame = view.frame
        var y : CGFloat = theFrame.origin.y - 15
        y -= (y/1.7)
        self.scrollToY(-y, velocity: velocity)
    }
    
    func scrollElement(view: UIView, toPoint y: CGFloat, velocity: NSTimeInterval) {
        let originY = view.frame.origin.y
        let diff = y - originY
        if (diff < 0) {
            self.scrollToY(diff, velocity: velocity)
        }
        else {
            self.scrollToY(0, velocity: velocity)
        }
    }
}