我需要用锅手势在屏幕上的点上移动并旋转视图

Question

我想使视图旋转并绕屏幕中心移动。

这是我想要实现的视觉表示。 image

和我当前的解决方案：

@objc func circleMoved(_ gesture: UIPanGestureRecognizer) {
    switch gesture.state {
    case .changed:
        let translation = gesture.translation(in: view)
    
        circle.layer.zPosition = 200
        let spread = view.width
        let angle: CGFloat = 100
        
        let angleMoveX = angle * translation.x / spread
        let angleMoveY = angle * translation.y / spread
        
        let angleMoveXRadians = angleMoveX * CGFloat.pi/180
        let angleMoveYRadians = angleMoveY * CGFloat.pi/180
        
        var move = CATransform3DIdentity
        move = CATransform3DRotate(move, angleMoveXRadians, 0, 1, 0)
        move = CATransform3DRotate(move, -angleMoveYRadians, 1, 0, 0)
        move = CATransform3DTranslate(move, translation.x, translation.y, 0)
        
        circle.layer.transform = CATransform3DConcat(circle.layer.transform, move)
    
    
        gesture.setTranslation(.zero, in: view)  } }

但是问题是它旋转比我想要的要多。 （最大60度）