Swift UIView Extension - Animation helper

Extensions.swift

import UIKit

extension UIViewController {
    
    func animateThing(thing: UIView, offsetX: CGFloat, offsetY: CGFloat, alpha: CGFloat, time: NSTimeInterval, delay: NSTimeInterval) {
        let targetY = thing.center.y
        let targetX = thing.center.x
        let targetAlpha = thing.alpha
        
        thing.center.y = thing.center.y - offsetY
        thing.center.x = thing.center.x - offsetX
        thing.alpha = thing.alpha - alpha
        
        
        UIView.animateWithDuration(time, delay: delay, options: UIViewAnimationOptions.CurveEaseOut, animations: { () -> Void in
            thing.center.y = targetY
            thing.center.x = targetX
            thing.alpha = targetAlpha
        }, completion: nil)
    }
}

gistfile1.txt

// use the code above like this: 
override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    
    //
    animateThing(self.label,    offsetY: 120,   offsetX: 0,     time: 1.0, delay: 0.0)
    animateThing(self.button,   offsetY: 200,   offsetX: -100,  time: 2.0, delay: 1.0)
    animateThing(self.box,      offsetY: 0,     offsetX: -400,  time: 1.0, delay: 4.0)
    //
}