问题
I have a layer that will move from point A to point B on a UIBezierPath. I have found a lot of samples those are refers to CAAnimation and UIBezierPath. But I need to move my layer only from specified point to another on bezier path.
Any suggestions would be appreciated.
Thanks
回答1:
Hope this will be helpful.
UIBezierPath *trackPath = [UIBezierPath bezierPath];
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.
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CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"position"];
anim.path = trackPath.CGPath;
anim.repeatCount = 1;
anim.duration = 2.0;
[layerToAnimate addAnimation:anim forKey:@"pathGuide"];
回答2:
If your bezier path is a circle or even a half circle, you could just skip the path and instead add the point to a larger square layer. Set the point to be a fixed distance from the center of that larger square layer. Then you can just rotate the larger layer on the z axis around the center whatever number of degrees you need it to move. Seems it would simplify things a bit, though I'm not sure exactly what else you need it to do.
回答3:
i'd been looking to do something like this and fount this tutorial, it shows how to follow a specific path. It works with a car (a CALayer) and a UIBezierpath as the race track and is solved in this order:
Defining the path the car should follow (in this case your BezierPath) Drawing the black line that defines the track; (N/A) Drawing the white dashed center-line of the track; (N/A) Creating the layer defining the car; (your Layer) Animating the car along the path. (What your asked!)
You can check the reference Post here: http://nachbaur.com/2011/01/07/core-animation-part-4/
Also you can download the source code here: http://cdn5.nachbaur.com/wp-content/uploads/2011/01/CALayerAnimTest.zip?25881d
hope this helps!
regards,
Jorge.
来源：https://stackoverflow.com/questions/13379100/move-calayer-via-uibezierpath