iOS開發之轉盤選單—Swift
阿新 • • 發佈:2020-12-10
前言
使用Swift實現的轉盤選單,主要用到UIBezierPath、CALayer遮罩繪製扇形UIView,CATransform3DMakeRotation實現旋轉動畫。程式碼設計使用預設configureCallback回撥方便建立和設定基本屬性,參考UITableView代理和資料來源模式,支援AutoLayout和Frame。
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效果圖
1.遮罩繪製扇形View
func setMaskLayer(_ startAngle: CGFloat, endAngle: CGFloat) { let center= CGPoint(x: bounds.width * 0.5, y: bounds.height * 0.5) let layer = CAShapeLayer() path.addArc(withCenter: center, radius: bounds.width * 0.5, startAngle: startAngle, endAngle: endAngle, clockwise: true) path.addLine(to: center) layer.path = path.cgPath layer.rasterizationScale = UIScreen.main.scale layer.shouldRasterize= true self.layer.mask = layer }
2.中間鏤空
func createHole(in view : UIView, radius: CGFloat) { let path = CGMutablePath() path.addArc(center: view.center, radius: radius, startAngle: 0.0, endAngle: 2.0 * .pi, clockwise: true) path.addRect(CGRect(origin: .zero, size: view.bounds.size)) let maskLayer = CAShapeLayer() maskLayer.path = path maskLayer.fillRule = .evenOdd view.layer.mask = maskLayer view.clipsToBounds = true }
3.旋轉動畫
新增UIPanGestureRecognizer、UITapGestureRecognizer手勢,根據手勢位置使用atan2函式計算旋轉角度,然後用CATransform3DMakeRotation圍繞Z軸旋轉做動畫 核心程式碼
func handlePanGesture(_ sender: UIPanGestureRecognizer) { let location = sender.location(in: self) switch sender.state { case .began: startPoint = location case .changed: let radian1 = -atan2(startPoint.x - menuLayerView.center.x, startPoint.y - menuLayerView.center.y) let radian2 = -atan2(location.x - menuLayerView.center.x, location.y - menuLayerView.center.y) menuLayerView.transform = menuLayerView.transform.rotated(by: radian2 - radian1) startPoint = location default: let angle = 2 * CGFloat(Double.pi) / CGFloat(cells.count) var menuViewAngle = atan2(menuLayerView.transform.b, menuLayerView.transform.a) if menuViewAngle < 0 { menuViewAngle += CGFloat(2 * Double.pi) } var index = cells.count - Int((menuViewAngle + CGFloat(Double.pi / 4)) / angle) if index == cells.count { index = 0 } setSelectedIndex(index, animated: true) } } func handleTapGesture(_ sender: UITapGestureRecognizer) { let location = sender.location(in: menuLayerView) for (index, cell) in cells.enumerated() { if cell.path.contains(location) { setSelectedIndex(index, animated: true) } } }
4.彈出收起動畫
func openMenuView(withAnimate animate: Bool = true) { openMenu = true UIView.animate(withDuration: animate ? configure.animationDuration : 0, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 5.0, options: .curveEaseInOut) { self.centerButton.transform = CGAffineTransform(rotationAngle: .pi * -0.5) self.centerButton.setImage(self.configure.closeImage, for: .normal) self.menuLayerView.transform = CGAffineTransform(scaleX: 1, y: 1).rotated(by: self.currentAngle) } } func closeMenuView(withAnimate animate: Bool = true) { openMenu = false let scale = (configure.centerRadius * 2) / bounds.width UIView.animate(withDuration: animate ? configure.animationDuration : 0, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 5.0, options: .curveEaseInOut) { self.centerButton.transform = .identity self.centerButton.setImage(self.configure.openImage, for: .normal) self.menuLayerView.transform = CGAffineTransform(scaleX: scale, y: scale).rotated(by: self.currentAngle) } }
5.內部細節
考慮到方便佈局和使用,內部使用UIView疊加旋轉實現,這裡也可以採用Layer直接繪製實現,相對UIView,層次結構會簡單很多
總結
核心程式碼已經貼出,完整程式碼請檢視----->>>CLDemo,如果對你有所幫助,歡迎Star。
原文作者:JmoVxia
原文地址:https://juejin.cn/post/6901870312829550605