引导图手势画圆

CGPointstartPoint = CGPointMake(30,260);

    CGPoint middlePoint = CGPointMake(160, 460);

    CGPoint endPoint = CGPointMake(320,260);

    

    CGMutablePathRef path =CGPathCreateMutable();

    CGPathMoveToPoint(path, NULL, startPoint.x, startPoint.y);

    CGPathAddQuadCurveToPoint(path, NULL,middlePoint.x, middlePoint.y,endPoint.x,endPoint.y);

    

    CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimationanimationWithKeyPath:@"position"];

    pathAnimation.removedOnCompletion = YES;

    pathAnimation.path = path;

    [pathAnimation setCalculationMode:kCAAnimationCubic];

    [pathAnimation setFillMode:kCAFillModeForwards];

    [pathAnimation setDelegate:self];

    pathAnimation.duration = 3.0;

    

    UIImageView *imageView = [[UIImageViewalloc]init];

    imageView.image = [UIImageimageNamed:@"jx_an.png"];

    imageView.backgroundColor = [UIColorclearColor];

    imageView.userInteractionEnabled =NO;

    imageView.frame = CGRectMake(7,220,55,80);

    [self.view addSubview:imageView];

    [imageView.layer addAnimation:pathAnimationforKey:nil];

参考资料：

如何画圆：http://hi.baidu.com/yaphets_fans/item/9f57367fc5f02b3571442391

张威  10:11

http://nachbaur.com/blog/core-animation-part-4

张威  10:12

http://stackoverflow.com/questions/3804453/iphone-how-to-make-a-circle-path-for-a-cakeyframeanimation/4708894#4708894