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本篇内容主要讲解“iOS开发实现转盘菜单Swift”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“iOS开发实现转盘菜单Swift”吧!
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使用Swift实现的转盘菜单,主要用到UIBezierPath
、CALayer
遮罩绘制扇形UIView
,CATransform3DMakeRotation
实现旋转动画。代码设计使用默认configureCallback
回调方便创建和设置基本属性,参考UITableView
代理和数据源模式,支持AutoLayout
和Frame
。
计算扇形曲线位置,通过CALayer
的mask
属性绘制出扇形UIView
核心代码
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 }
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 }
添加UIPanGestureRecognizer
、UITapGestureRecognizer
手势,根据手势位置使用atan2
函数计算旋转角度,然后用CATransform3DMakeRotation
围绕Z
轴旋转做动画 核心代码
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) } } }
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) } }
考虑到方便布局和使用,内部使用UIView
叠加旋转实现,这里也可以采用Layer
直接绘制实现,相对UIView
,层次结构会简单很多
到此,相信大家对“iOS开发实现转盘菜单Swift”有了更深的了解,不妨来实际操作一番吧!这里是创新互联网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!