动画CAShapeLayer大小更改 [英] Animating CAShapeLayer size change

问题描述

我画一个圆圈，初始半径为200

I am drawing a circle, with an initial radius of 200

self.circle = [CAShapeLayer layer];
self.circle.fillColor = nil;
self.circle.strokeColor = [UIColor blackColor].CGColor;
self.circle.lineWidth = 7;
self.circle.bounds = CGRectMake(0, 0, 2 * radius, 2 * radius);
self.circle.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.radius, self.radius)

任何人都可以告诉我如何将更改设置为半径100的动画吗？

Can anyone please tell me how to animate a change to a radius of 100?

推荐答案

这就是我最终的结果这样做：

This is how I ended up doing it:

UIBezierPath *newPath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(newRadius, newRadius) radius:newRadius startAngle:(-M_PI/2) endAngle:(3*M_PI/2) clockwise:YES];
CGRect newBounds = CGRectMake(0, 0, 2 * newRadius, 2 * newRadius);

CABasicAnimation* pathAnim = [CABasicAnimation animationWithKeyPath: @"path"];
pathAnim.toValue = (id)newPath.CGPath;

CABasicAnimation* boundsAnim = [CABasicAnimation animationWithKeyPath: @"bounds"];
boundsAnim.toValue = [NSValue valueWithCGRect:newBounds];

CAAnimationGroup *anims = [CAAnimationGroup animation];
anims.animations = [NSArray arrayWithObjects:pathAnim, boundsAnim, nil];
anims.removedOnCompletion = NO;
anims.duration = 2.0f;
anims.fillMode  = kCAFillModeForwards;

[self.circle addAnimation:anims forKey:nil];

感谢雅各布让我指向正确的方向。

Thanks to Jacob for pointing me in the right direction.

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