how to draw line with animation?

I have implemented game application in which i want to draw line between two object.I have drawn line between two objects.But i want to draw with animation.can u advise me which animation i have to used between two p开发者_如何学Coints.

Edit:My excatly question is that: Suppose there is two point like start point(100,100) and endpoint(300,300).I can draw line between this two point but i want to draw line with animation.I mean i can see line start from start point to end point with 2 secon duration.please help me about this question.

+1 for Brad's answer—it'll work—but it looks like you can accomplish the same thing in a more straightforward fashion by animating the strokeStart and strokeEnd properties on CAPathLayer.

See http://oleb.net/blog/2010/12/animating-drawing-of-cgpath-with-cashapelayer/

If you're looking to animate the extension of a line from point A to between points A and B, my recommendation would be to use a CAShapeLayer for this. CAShapeLayer lets you animate the interpolation between two paths with the same number of control points. For an example of this in action, see Joe Ricioppo's post on the subject.

In your case, you'd start with a path that has two control points, both the same point, and use as the final path one that has a control point at the start of the line and one at the end. The line will then animate out as if it were being drawn in a single brush stroke.