关键帧动画实现圆弧动画

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/*

 CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation

 animationWithKeyPath:@"position"];

 pathAnimation.calculationMode = kCAAnimationPaced;

 pathAnimation.fillMode = kCAFillModeForwards;

 pathAnimation.removedOnCompletion = NO;

 pathAnimation.duration = 15.0;

 pathAnimation.repeatCount = 1;

 CGMutablePathRef curvedPath = CGPathCreateMutable();

 CGPathMoveToPoint(curvedPath, NULL, x+15, y);

 CGPathAddQuadCurveToPoint(curvedPath, NULL, 20, 10, 100, 330);

 pathAnimation.path = curvedPath;

 CGPathRelease(curvedPath);

 Yourimage.center=CGPointMake(x, y);

 [Yourimage.layer addAnimation:pathAnimation forKey:@"moveTheSquare"];

  

 */

 

 

 

UIView *aView = [[UIView alloc]initWithFrame:CGRectMake(150, 50, 20, 20)];

 

 

aView.backgroundColor = [UIColor greenColor];

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation

                                      animationWithKeyPath:@"position"];

pathAnimation.calculationMode = kCAAnimationPaced;

pathAnimation.fillMode = kCAFillModeForwards;

pathAnimation.removedOnCompletion = NO;

pathAnimation.duration = 0.5;

pathAnimation.repeatCount = 20;

CGMutablePathRef curvedPath = CGPathCreateMutable();

CGPathAddArc(curvedPath, NULL, 160, 240, 100, 0,2*M_PI , 0);

pathAnimation.path = curvedPath;

CGPathRelease(curvedPath);

[aView.layer addAnimation:pathAnimation forKey:@"moveTheCircleOne"];

 

[self.view addSubview:aView];