将视图从原点旋转到另一个视图

我试图将一个视图旋转到另一个视图中心点(记住不要绕着它转,它是朝着的)。

假设我有两个这样的视图

现在我想旋转俯视图来指向这样的俯视图

所以这就是我所做的

• 计算第一个视图原点和底部视图中心之间的角度

• 并将计算出的变换应用于俯视图。

  低于我使用的代码

  let rect = CGRect(x: 70, y: 200, width: 300, height: 100)
  let rectView = UIView(frame: rect)
  rectView.layer.borderColor = UIColor.green.cgColor;
  rectView.layer.borderWidth = 2;
  
  let endView = UIView(frame: CGRect(x: 250, y: 450, width: 70, height: 70))
  endView.layer.borderColor = UIColor.green.cgColor;
  endView.layer.borderWidth = 2;
  let end = endView.center;
  
  self.view.addSubview(endView)
  self.view.addSubview(rectView!)
  rectView.setAnchorPoint(CGPoint.zero)
  
  let angle = rectView.bounds.origin.angle(to: end);
  UIView.animate(withDuration: 3) {
      rectView.transform = rectView.transform.rotated(by: angle)
  }   
  

我用这个分机 Get angle from 2 positions 计算两点之间的角度

extension CGPoint {
  func angle(to comparisonPoint: CGPoint) -> CGFloat {
    let originX = comparisonPoint.x - self.x
    let originY = comparisonPoint.y - self.y
    let bearingRadians = atan2f(Float(originY), Float(originX))
    var bearingDegrees = CGFloat(bearingRadians).degrees
    while bearingDegrees < 0 {
        bearingDegrees += 360
    }
    return bearingDegrees
  }
}

extension CGFloat {
    var degrees: CGFloat {
        return self * CGFloat(180.0 / M_PI)
    }
}

extension UIView {
    func setAnchorPoint(_ point: CGPoint) {
        var newPoint = CGPoint(x: bounds.size.width * point.x, y: bounds.size.height * point.y)
        var oldPoint = CGPoint(x: bounds.size.width * layer.anchorPoint.x, y: bounds.size.height * layer.anchorPoint.y);

        newPoint = newPoint.applying(transform)
        oldPoint = oldPoint.applying(transform)

        var position = layer.position

        position.x -= oldPoint.x
        position.x += newPoint.x

        position.y -= oldPoint.y
        position.y += newPoint.y

        layer.position = position
        layer.anchorPoint = point
    }
}

我想这个问题和角度是怎么计算的有关,但我不知道是什么?

任何帮助都非常感谢。