CGContextAddQuadCurveToPoint(context, 10, 450, 310, 450);
//CGContextAddQuadCurveToPoint(context, 310, 10, 10, 10);
//划线
CGContextDrawPath(context, kCGPathStroke);
//得到一个image 从目前的矢量上下文
UIImage *curve = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageView *curveView = [[UIImageView alloc]initWithImage:curve];
curveView.frame = CGRectMake(1, 1, 320, 460);
[curveView setBackgroundColor:[UIColor clearColor]];
[self.view addSubview:curveView];
}
-(void)animateCicleAlongPath
{
//准备关键帧动画
CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
pathAnimation.calculationMode = kCAAnimationPaced;
pathAnimation.fillMode = kCAFillModeForwards;
pathAnimation.removedOnCompletion = NO;
pathAnimation.duration = 5.0f;
pathAnimation.repeatCount = 200;
//pathAnimation.autoreverses = YES; //原路返回，而不是从头再来
//设置动画路径
//CGPoint endPoint = CGPointMake(310, 450);
CGMutablePathRef curvedPath = CGPathCreateMutable();
CGPathMoveToPoint(curvedPath, NULL, 10, 10);
CGPathAddQuadCurveToPoint(curvedPath, NULL, 10, 450, 310, 450);
CGPathAddQuadCurveToPoint(curvedPath, NULL, 310, 10, 10, 10);
//已经有了路径，我们要告诉动画 路径
pathAnimation.path = curvedPath;
CGPathRelease(curvedPath); //这里要手工释放
[self.ViewTest.layer addAnimation:pathAnimation forKey:nil];
}
/**************************************************************************/
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
最后附上Demo下载地址：http://download.csdn.net/detail/u012951123/7500419
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