在iPhone上使用CAKeyFrameAnimation绘制路径 [英] Drawing a path with CAKeyFrameAnimation on iPhone

问题描述

我想逐渐绘制一条路径，即我希望路径看起来好像是手工绘制的。我设法创造了我需要的道路。我还设法创建了一个使用此路径的CAKeyFrameAnimation。但到目前为止，我只能沿着这条路径移动一个物体。我想在路径上移动一个对象（比如一支铅笔），并且路径看起来好像是绘制的。

I want to draw a path gradually, i.e. I want the path to appear as if it is drawn by hand. I have managed to create the path I need. I have also managed to create a CAKeyFrameAnimation that uses this path. But so far I can only move an object along this path. I would like to both move an object (say a pencil) along the path, and have the path appear as if it is drawn.

任何指针？

推荐答案

使用您的路径创建 CAShapeLayer 并为图层的<$设置动画c $ c> strokeEnd 从 0.0 到 1.0 。 （这是iOS SDK 4.2中的新功能，不适用于以前的版本。）

Create a CAShapeLayer with your path and animate the layer's strokeEnd from 0.0 to 1.0. (This is new in iOS SDK 4.2, won't work with previous versions.)

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