ios – 如何在Swift中移动图像？

@IBACtion func tapButton() {
UIView.animateWithDuration(0.75,delay: 0,options: UIViewAnimationOptions.CurveLinear,animations: {
            self.puppy.alpha = 1
            self.puppy.center.y = 0
            },completion: nil)

        var toPoint: CGPoint = CGPointMake(0.0,1.0)
        var fromPoint : CGPoint = CGPointZero

        var movement = CABasicAnimation(keyPath: "movement")
        movement.additive = true
        movement.fromValue =  NSValue(CGPoint: fromPoint)
        movement.toValue =  NSValue(CGPoint: toPoint)
        movement.duration = 0.3

        view.layer.addAnimation(movement,forKey: "move")
}