CAPropertyAnimation对象keyPath属性的strokeStart和strokeEnd两个值

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CAShapeLayer的strokeStart和strokeEnd属性
http://blog.sina.com.cn/s/blog_51a995b70102vdfe.html

keyPath = strokeStart 动画的fromValue = 0，toValue = 1
表示从路径的0位置画到1位置，由右向左消除
keyPath = strokeStart 动画的fromValue = 1，toValue = 0
表示从路径的1位置画到0位置，由左向右绘制
keyPath = strokeEnd 动画的fromValue = 0，toValue = 1
表示从路径的0位置画到1位置，由右向左绘制
keyPath = strokeEnd 动画的fromValue = 1，toValue = 0
表示从路径的0位置画到1位置，由左向右消除
注释：动画的0-1（fromValue = 0，toValue = 1）或1-0 （fromValue = 1，toValue = 0）表示执行的方向和路径的范围。

    UIBezierPath *path = [UIBezierPath bezierPath];    [path moveToPoint:CGPointMake(30,160)];    [path addLineToPoint:CGPointMake(300,160)];    CAShapeLayer *pathLayer = [CAShapeLayer layer];    pathLayer.frame = self.eraserAnimationLayer.bounds;    pathLayer.bounds = CGRectMake(0, 0, 320, 480);    pathLayer.path = path.CGPath;    pathLayer.strokeColor = [[UIColor blueColor] CGColor];    pathLayer.fillColor = nil;    pathLayer.lineWidth = 70.0f;    pathLayer.lineJoin = kCALineJoinBevel;    self.eraserPathLayer = pathLayer;    [self.view.layer addSublayer:pathLayer];    CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeStart"];    pathAnimation.duration = 2.0;    pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];    pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];    pathAnimation.delegate = self;    [pathAnimation setValue:@"eraser" forKey:@"id"];    [self.eraserPathLayer addAnimation:pathAnimation forKey:@"strokeStart"];

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