Morph the shape easier. Animate basic shape tweening by just setting the side.
var shapeTweenView = NRShapeTweenView(frame: frame)
shapeTweenView.side = 1.0 //must be greater than 1
shapeTweenView.side = 3.33
shapeTweenView.side = 4.0
shapeTweenView.animateToSide(6.0, duration: 3.0)
shapeTweenView.borderColor = UIColor.blackColor()
shapeTweenView.borderWidth = 2.0
shapeTweenView.fillColor = UIColor.blackColor()
Developed by Nutchaphon Rewik