Swift: move UIView on slide gesture

Finally did it like below.

let gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
slideUpView.addGestureRecognizer(gesture)
slideUpView.userInteractionEnabled = true
gesture.delegate = self

The following function is called when the gesture is detected, (here I am restricting the view to have a maximum centre.y of 555, & I'm resetting back to 554 when the view moves past this point)

func wasDragged(gestureRecognizer: UIPanGestureRecognizer) {
    if gestureRecognizer.state == UIGestureRecognizerState.Began || gestureRecognizer.state == UIGestureRecognizerState.Changed {
        let translation = gestureRecognizer.translationInView(self.view)
        print(gestureRecognizer.view!.center.y)
        if(gestureRecognizer.view!.center.y < 555) {
            gestureRecognizer.view!.center = CGPointMake(gestureRecognizer.view!.center.x, gestureRecognizer.view!.center.y + translation.y)
        }else {
            gestureRecognizer.view!.center = CGPointMake(gestureRecognizer.view!.center.x, 554)
        }

        gestureRecognizer.setTranslation(CGPointMake(0,0), inView: self.view)
    }

}

You probably want to use a UIPanGestureRecognizer.

let gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
customView.addGestureRecognizer(gesture)
gesture.delegate = self

And to drag the object only along the y-axis:

func wasDragged(gesture: UIPanGestureRecognizer) {
    let translation = gesture.translationInView(self.view)

    // Use translation.y to change the position of your customView, e.g.
    customView.center.y = translation.y // Customize this.
}