swift版动画

         //创建label            var labela = UILabel(frame: CGRectMake(10,90, 100, 35))            labela.text = "label"            labela.textAlignment = NSTextAlignment.Center            labela.backgroundColor = UIColor.orangeColor()            self.view.addSubview(labela)                        //动画            UIView.beginAnimations("aa", context: nil)            labela.frame.origin.x = 270            UIView.commitAnimations()