iOS高仿微信文章悬浮球功能

self.interactivePopGestureRecognizer?.delegate = self

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
  return true
 }

let gesture = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(handleNavigationTransition(gesture:)))
gesture.edges = .left
self.view.addGestureRecognizer(gesture)

override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
  let roundEntryViewPoint = self.convert(point, to: roundEntryView)
  if roundEntryView.point(inside: roundEntryViewPoint, with: event) == true {
   return true
  }
  let collectViewPoint = self.convert(point, to: collectView)
  if collectView.point(inside: collectViewPoint, with: event) == true {
   return true
  }
  return false
 }

func updateBGLayerPath(isSmall: Bool) {
  var ratio:CGFloat = 1
  if !isSmall {
   ratio = 1.3
  }
  let path = UIBezierPath()
  path.move(to: CGPoint(x: viewSize.width, y: (1 - ratio)*viewSize.height))
  path.addLine(to: CGPoint(x: viewSize.width, y: viewSize.height))
  path.addLine(to: CGPoint(x: (1 - ratio)*viewSize.width, y: viewSize.height))
  path.addArc(withCenter: CGPoint(x: viewSize.width, y: viewSize.height), radius: viewSize.width*ratio, startAngle: CGFloat(Double.pi), endAngle: CGFloat(Double.pi*3/2), clockwise: true)
  path.close()
  bgLayer.path = path.cgPath
 }
 override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
  return bgLayer.path!.contains(point)
 }