如何解决iOS-如何在使用自定义UIBezierPath绘制的CAShapeLayer中设置CATextLayer？
我要编写一个自定义饼图菜单。在下面的代码中，您将看到如何创建包含两个项目的饼图菜单。我的结构如下：我使用带有CAShapeLayer作为上下文的矩形UIBezierPath作为圆形背景。在我的圆形背景内，我有一个孩子，一个小内圈（还有带有CAShapeLayer的UIBezierPath）。我的圆形背景图层的其他子元素是项目，它们也是CAShapeLayer，使用自定义UIBezierPath（我绘制项目取决于项目的数量（不同程度，依此类推））。现在，我想在每个项目层中添加一个CATextLayer（“项目1”，“项目2”，依此类推）。我的问题是，我不知道如何设置特定项目图层的框架，以及如何以文本动态位于父项目图层内部的方式添加特定的CATextLayer。就我而言，CATextLayer取决于菜单背景层的框架。
func setMenuBackgroundLayer() {
//Draw a circle background with UIBezierPath for the static pie menu
let path = UIBezierPath(arcCenter: CGPoint(x: self.frame.size.width / 2,y: self.frame.size.height / 2),radius: menuRadius,startAngle: CGFloat(0),endAngle: CGFloat(Double.pi * 2),clockwise: true)
menuBackgroundLayer = CAShapeLayer()
menuBackgroundLayer.path = path.cgPath
menuBackgroundLayer.fillColor = menuBackgroundLayerColor.cgColor
menuBackgroundLayer.frame = self.bounds
menuBackgroundLayer.zPosition = 1
self.layer.addSublayer(menuBackgroundLayer)
//Draw the inner circle (back button)
let pathInner = UIBezierPath(arcCenter: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,y: menuBackgroundLayer.frame.size.height / 2),radius: innerCircleRadius,clockwise: true)
innerCircleLayer = CAShapeLayer()
innerCircleLayer.path = pathInner.cgPath
innerCircleLayer.fillColor = menuBackgroundLayerColor.cgColor
innerCircleLayer.strokeColor = UIColor.black.cgColor
innerCircleLayer.lineWidth = 1
innerCircleLayer.frame = menuBackgroundLayer.frame
menuBackgroundLayer.addSublayer(innerCircleLayer)
//Set the inner circle above all other menu items
innerCircleLayer.zPosition = 100
//Add the arrow image inside the inner circle
//addBackImage()
}
func insertMenuItems() {
//Compare which item has to get inserted and insert it
if numberOfItems == 1 {
let path = UIBezierPath(arcCenter: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,clockwise: true)
item1Layer = CAShapeLayer()
item1Layer.path = path.cgPath
item1Layer.fillColor = menuBackgroundLayerColor.cgColor
item1Layer.strokeColor = UIColor.black.cgColor
item1Layer.lineWidth = 1
item1Layer.frame = menuBackgroundLayer.bounds
menuBackgroundLayer.addSublayer(item1Layer)
item1Layer.zPosition = 2
let textLayer = CATextLayer()
textLayer.string = "ITEM 1"
textLayer.foregroundColor = UIColor.white.cgColor
textLayer.font = UIFont(name: "Avenir",size: 15.0)
textLayer.fontSize = 15.0
textLayer.alignmentMode = CATextLayerAlignmentMode.center
textLayer.zPosition = 3
textLayer.frame = item1Layer.bounds
textLayer.position = CGPoint(x: item1Layer.position.x,y: item1Layer.position.y + 20.0)
textLayer.contentsScale = UIScreen.main.scale
item1Layer.addSublayer(textLayer)
}
else if numberOfItems == 2 {
//Item 1
let path1 = UIBezierPath()
path1.move(to: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,y: menuBackgroundLayer.frame.size.height / 2))
path1.addArc(withCenter: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,startAngle: rad2deg(180.0),endAngle: rad2deg(0.0),clockwise: true)
path1.close()
item1Layer = CAShapeLayer()
item1Layer.path = path1.cgPath
item1Layer.fillColor = menuBackgroundLayerColor.cgColor
item1Layer.strokeColor = UIColor.black.cgColor
item1Layer.lineWidth = 1
item1Layer.frame = menuBackgroundLayer.bounds
menuBackgroundLayer.addSublayer(item1Layer)
item1Layer.zPosition = 2
let textLayer1 = CATextLayer()
textLayer1.string = "ITEM 1"
textLayer1.foregroundColor = UIColor.white.cgColor
textLayer1.font = UIFont(name: "Avenir",size: 15.0)
textLayer1.fontSize = 15.0
textLayer1.alignmentMode = CATextLayerAlignmentMode.center
textLayer1.zPosition = 3
textLayer1.frame = item1Layer.bounds
textLayer1.position = CGPoint(x: item1Layer.position.x,y: item1Layer.position.y + 20.0)
textLayer1.contentsScale = UIScreen.main.scale
item1Layer.addSublayer(textLayer1)
//Item 2
let path2 = UIBezierPath()
path2.move(to: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,y: menuBackgroundLayer.frame.size.height / 2))
path2.addArc(withCenter: CGPoint(x: menuBackgroundLayer.frame.size.width / 2,startAngle: rad2deg(0.0),endAngle: rad2deg(180.0),clockwise: true)
path2.close()
item2Layer = CAShapeLayer()
item2Layer.path = path2.cgPath
item2Layer.fillColor = menuBackgroundLayerColor.cgColor
item2Layer.strokeColor = UIColor.black.cgColor
item2Layer.lineWidth = 1
item2Layer.frame = menuBackgroundLayer.bounds
menuBackgroundLayer.addSublayer(item2Layer)
item2Layer.zPosition = 2
let textLayer2 = CATextLayer()
textLayer2.string = "ITEM 2"
textLayer2.foregroundColor = UIColor.white.cgColor
textLayer2.font = UIFont(name: "Avenir",size: 15.0)
textLayer2.fontSize = 15.0
textLayer2.alignmentMode = CATextLayerAlignmentMode.center
textLayer2.zPosition = 3
textLayer2.frame = item2Layer.bounds
textLayer2.position = CGPoint(x: item2Layer.position.x,y: item2Layer.position.y + 20.0)
textLayer2.contentsScale = UIScreen.main.scale
item2Layer.addSublayer(textLayer2)
}
and so on...
}
解决方法
因此，这是一个粗糙的原型，可以满足您的需要，但不够精确。
如果要旋转文本，可以使用CATransform来实现。
您可以在此处使用以下代码：https://github.com/gatamar/stackoverflow_answers/tree/master/so64348954
或者，如果您几乎需要它，我可以更精确些。
“饼图菜单”的代码：
import Foundation
import UIKit
class HackLinesView: UIView {
init(frame: CGRect,partsCount parts: Int) {
super.init(frame: frame)
backgroundColor = .clear
let side = frame.width/2
// add lines
for part in 0..<parts {
let angle = CGFloat(part)/CGFloat(parts) * 2 * .pi
let lineLayer = CAShapeLayer()
lineLayer.backgroundColor = UIColor.black.cgColor
let path = UIBezierPath(rect: CGRect(x: 0,y: 0,width: 1,height: side))
lineLayer.path = path.cgPath
lineLayer.transform = CATransform3DMakeRotation(angle,1)
layer.addSublayer(lineLayer)
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class PieMenuView: UIView {
init(frame: CGRect,partsCount parts: Int) {
assert( abs(frame.width-frame.height) < 0.001)
super.init(frame: frame)
setupLayers(parts)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupLayers(_ parts: Int) {
let side = bounds.width
let outerRadius = side * 0.5
let innerRadius = side * 0.2
// add outer circle
let outerCircleLayer = CAShapeLayer()
outerCircleLayer.frame = bounds
outerCircleLayer.cornerRadius = outerRadius
outerCircleLayer.backgroundColor = UIColor.orange.cgColor
layer.addSublayer(outerCircleLayer)
// add inner circle
let innerCircleLayer = CAShapeLayer()
innerCircleLayer.frame = CGRect(x: side/2-innerRadius,y: side/2-innerRadius,width: innerRadius*2,height: innerRadius*2)
innerCircleLayer.cornerRadius = innerRadius
innerCircleLayer.backgroundColor = UIColor.yellow.cgColor
layer.addSublayer(innerCircleLayer)
let linesView = HackLinesView(frame: CGRect(x: side/2,y: side/2,width: side,height: side),partsCount: parts)
addSubview(linesView)
// add text
for part in 0..<parts {
let angle = CGFloat(part)/CGFloat(parts) * 2 * .pi
let textLayer = CATextLayer()
textLayer.string = String(format: "%d",part)
textLayer.foregroundColor = UIColor.blue.cgColor
// calc the center for text layer
let x1 = side/2
let y1 = side/2
let x2 = x1 + cos(angle)*outerRadius
let y2 = y1 + sin(angle)*outerRadius
let textCenterX = (x1 + x2)/2,textCenterY = (y1 + y2)/2
let textLayerSide: CGFloat = 50
textLayer.frame = CGRect(x: textCenterX-textLayerSide/2,y: textCenterY-textLayerSide/2,width: textLayerSide,height: textLayerSide)
layer.addSublayer(textLayer)
}
}
}
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