Pan Gesture Drag

example.swift

// Simple drag using pan UIPanGestureRecognizer
func handlePanGesture(panGesture: UIPanGestureRecognizer) {
    // translation 
    let translation = panGesture.translationInView(view)
    panGesture.setTranslation(CGPointZero, inView: view)
    // DX DY
    let object = panGesture.view as! UIView
    var offset = object.center
    object.center = CGPoint(x: object.center.x + translation.x, y: object.center.y + translation.y)
}

// Add a gesture
let pan = UIPanGestureRecognizer(target: self, action: Selector("handlePanGesture:"))
someObject.addGestureRecognizer(pan)