UIBezierPath最后一点的UIImage

Question

我想在UIBezierPath的最后一点添加一个UIImage，如下图所示：

Circle Path

代码：

let consume = 0.25
let x = self.frame.size.width / 2.0
let y = self.frame.size.height / 2.0
let radius = (frame.size.width - 10) / 2.0
let startAngle: CGFloat = CGFloat(M_PI * (-1/2))
let endAngle = CGFloat(M_PI * 2 - M_PI/2 * consume)
let circlePath = UIBezierPath(arcCenter: CGPoint(x: x, y: y), radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise: false)

circleLayer = CAShapeLayer()
circleLayer.path = circlePath.cgPath
circleLayer.fillColor = UIColor.clear.cgColor
circleLayer.strokeColor = UIColor.red.cgColor
circleLayer.lineWidth = 8.0;

let image = UIImage(named: "myCoolImage")
let imageView = UIImageView(image: image)
// coordX and coordY must be at last point of UIBezierPath
imageView.frame = CGRect(x: coordX, y: coordY, width: 20.0, height: 20.0)
self.addSubview(imageView)

我尝试过以下方法：

let coordX: CGFloat = cos(endAngle) * radius
let coordY: CGFloat = sin(endAngle) * radius

结果： Positive coordX and coordY

主要问题是如何计算coordX和coordY。

Answer 1

为了得到一个真实的，完全充实的答案，这基本上就是你需要的。

{{1}}