如何在没有第 3 方库的情况下绘制饼图，获得的标记用总标记中的一些颜色填充 iOS Swift

Question

我要这样

任何代码示例将不胜感激

Answer 1

您真正想要的是定制的东西。这可以自定义构建，也可以使用经过某些修改的第三方库。你有一堆在可可足类动物上，但我建议的是 https://github.com/danielgindi/Charts

Answer 2

这是一个起点...为您的帮助创建了一个循环进度视图

import UIKit
public class CircularProgressView: UIView {
  // First create two layer properties
  private lazy var circleLayer : CAShapeLayer = {
    let shape = CAShapeLayer()
    shape.fillColor = UIColor.clear.cgColor
    shape.lineCap = .round
    shape.lineWidth = 30.0
    shape.strokeColor = #colorLiteral(red: 0.7999292612, green: 0.8000453115, blue: 0.7999040484, alpha: 1)
    return shape

  }()

  private lazy var progressLayer : CAShapeLayer = {
    let progress = CAShapeLayer()
    progress.fillColor = UIColor.clear.cgColor
   // progress.lineCap = .round
       progress.lineWidth = 30.0
       progress.strokeEnd = 0
       progress.strokeColor = #colorLiteral(red: 0.07347138971, green: 0.5590900779, blue: 0.8216868043, alpha: 1)
    return progress
  }()


  override init(frame: CGRect) {
    super.init(frame: frame)
    createCircularPath()
  }
  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    createCircularPath()
  }


 private func createCircularPath() {

    updatePath()
    layer.addSublayer(circleLayer)
    layer.addSublayer(progressLayer)
  }
  public override func layoutSubviews() {
    updatePath()
  }

  private func updatePath() {
    let circularPath = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: 80, startAngle: -.pi / 2, endAngle: 3 * .pi / 2, clockwise: true)

       circleLayer.path = circularPath.cgPath
       progressLayer.path = circularPath.cgPath
  }

}
public extension CircularProgressView {
  func progressAnimation(_ percentage:Float) {

    let circularProgressAnimation = CABasicAnimation(keyPath: "strokeEnd")
    circularProgressAnimation.duration = 1
    circularProgressAnimation.toValue = Float( percentage / 100 )
    circularProgressAnimation.fillMode = .forwards
    circularProgressAnimation.isRemovedOnCompletion = false
    progressLayer.add(circularProgressAnimation, forKey: "progressAnim")
  }
}

如何在没有第 3 方库的情况下绘制饼图，获得的标记用总标记中的一些颜色填充 iOS Swift

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