Ios 改变动画的位置？

我使用的代码是我在上一篇stackOverFlow文章中修改的。我想更改动画的位置，但当我运行它时，它不会更改到我想要的位置。相反，它将是一些像素远。基本上我想要的是，我想要输入一个480-0和320-0之间的X值或Y值，并使用circle.position将动画设置到该位置。我该怎么做

-(CAShapeLayer *)addCircleYellownWithRadius:(float)radius5 withduration:(float)duration X:(float)x Y:(float)y{
    int radius = (int)radius5;
    CAShapeLayer *circle = [CAShapeLayer layer];
    // Make a circular shape
    circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius)
                                             cornerRadius:radius].CGPath;
    // Center the shape in self.view
    circle.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius,
                                  CGRectGetMidY(self.view.frame)-radius);



    // Configure the apperence of the circle
    circle.fillColor = [UIColor clearColor].CGColor;
    circle.strokeColor = [UIColor whiteColor].CGColor;
    circle.lineWidth = 5;

    // Add to parent layer
    [self.view.layer addSublayer:circle];

    // Configure animation
    CABasicAnimation *drawAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    drawAnimation.duration            = duration; // "animate over 10 seconds or so.."
    drawAnimation.repeatCount         = 1.0;  // Animate only once..

    // Animate from no part of the stroke being drawn to the entire stroke being drawn
    drawAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
    drawAnimation.toValue   = [NSNumber numberWithFloat:1.0f];

    // Experiment with timing to get the appearence to look the way you want
    drawAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

    // Add the animation to the circle
    [circle addAnimation:drawAnimation forKey:@"drawCircleAnimation"];
    return circle;
}

取代

circle.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius,
                                  CGRectGetMidY(self.view.frame)-radius);

有,

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我很高兴看到“动画超过10秒左右…”的评论继续存在；）@戴维德龙·恩克维斯特几乎是，但（我认为）不完全是

circle.position = CGPointMake(x-radius, y-radius);