运行效果如下：
//
// AKDashboardView.swift
// AKSwifty
//
// Created by wangcong on 01/04/2017.
// Copyright © 2017 ApterKing. All rights reserved.
//
import UIKit
// 指针
class AKNeedleView: UIView {
public var color = UIColor.red {
didSet {
self.setNeedsDisplay()
}
}
convenience init() {
self.init(frame: CGRect.zero)
}
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.clear
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func draw(_ rect: CGRect) {
super.draw(rect)
let context = UIGraphicsGetCurrentContext()
context?.setFillColor(UIColor.clear.cgColor)
context?.setStrokeColor(color.cgColor)
// 绘制第一条线
context?.setLineWidth(1)
context?.move(to: CGPoint(x: 0, y: rect.height / 2.0))
context?.addLine(to: CGPoint(x: rect.width * 2.0 / 3.0, y: rect.height / 2.0))
context?.drawPath(using: CGPathDrawingMode.fillStroke)
// 绘制第二条线
context?.setLineWidth(2)
context?.setLineCap(CGLineCap.round)
context?.move(to: CGPoint(x: rect.width * 2.0 / 3.0, y: rect.height / 2.0))
context?.addLine(to: CGPoint(x: rect.width - 12, y: rect.height / 2.0))
context?.drawPath(using: CGPathDrawingMode.fillStroke)
// 绘制小圆圈
context?.setLineWidth(2)
context?.addArc(center: CGPoint(x: rect.width - 8, y: rect.height / 2.0), radius: 4, startAngle: 0, endAngle: CGFloat(Double.pi * 2), clockwise: true)
context?.drawPath(using: CGPathDrawingMode.fillStroke)
// 绘制小圆边缘阴影
context?.setStrokeColor(color.withAlphaComponent(0.5).cgColor)
context?.addArc(center: CGPoint(x: rect.width - 8, y: rect.height / 2.0), radius: 6, startAngle: 0, endAngle: CGFloat(Double.pi * 2), clockwise: true)
context?.strokePath() }
}
class AKDashboardView: UIView {
// Edge
private lazy var outEdgeLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.white.cgColor
shapeLayer.lineWidth = 2.0
shapeLayer.lineCap = kCALineCapButt
return shapeLayer
}()
private lazy var inEdgeLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.white.cgColor
shapeLayer.lineWidth = 2.0
shapeLayer.lineCap = kCALineCapButt
return shapeLayer
}()
public var edgeColor = UIColor.white {
didSet {
self.outEdgeLayer.strokeColor = edgeColor.cgColor
self.inEdgeLayer.strokeColor = edgeColor.cgColor
}
}
public var edgeWidth: CGFloat = 2.0 {
didSet {
self.outEdgeLayer.lineWidth = edgeWidth
self.resetAll()
}
}
public var edgeSpacing: CGFloat = 40 {
didSet {
self.maskLayer.lineWidth = edgeSpacing
self.longScaleLayer.lineWidth = edgeSpacing / 3
self.shortScaleLayer.lineWidth = edgeSpacing / 4
self.resetAll()
}
}
// 长刻度
private lazy var longScaleLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.white.cgColor
shapeLayer.lineWidth = 40 / 6
shapeLayer.lineCap = kCALineCapButt
return shapeLayer
}()
public var longScaleColor = UIColor.white {
didSet {
longScaleLayer.strokeColor = longScaleColor.cgColor
}
}
public var longScales: Int = 5 {
didSet {
resetLongScaleLayer()
resetLongScaleTextLayer()
}
}
// 长刻度文字
private var longScaleTextLayer: CALayer = CALayer()
public var longScaleTextColor = UIColor.white {
didSet {
guard let sublayers = longScaleTextLayer.sublayers else {
return
}
for sublayer in sublayers {
if let textLayer = sublayer as? CATextLayer {
textLayer.foregroundColor = longScaleTextColor.cgColor
}
}
}
}
public var longScaleTexts: [String] = [] {
didSet {
resetLongScaleTextLayer()
}
}
// 短刻度
private lazy var shortScaleLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.white.cgColor
shapeLayer.lineWidth = 40 / 8
shapeLayer.lineCap = kCALineCapButt
return shapeLayer
}()
public var shortScaleColor = UIColor.white {
didSet {
shortScaleLayer.strokeColor = shortScaleColor.cgColor
}
}
public var shortScales: Int = 1 { // 短的刻度是：在长刻度区间内的分度值
didSet {
resetShortScaleLayer()
}
}
// 进度条
private lazy var maskLayer: CAShapeLayer = {
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = 40
shapeLayer.strokeStart = 0.0
shapeLayer.strokeEnd = 0.0
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = UIColor.white.cgColor
return shapeLayer
}()
private lazy var gradientLayer: CAGradientLayer = {
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [UIColor.green.cgColor, UIColor.orange.cgColor, UIColor.red.cgColor]
gradientLayer.startPoint = CGPoint(x: 0, y: 0)
gradientLayer.endPoint = CGPoint(x: 1, y: 0)
return gradientLayer
}()
public var gradientColors: [UIColor] = [UIColor.green, UIColor.orange, UIColor.red] {
didSet {
var cgColors = [CGColor]()
for color in gradientColors {
cgColors.append(color.cgColor)
}
gradientLayer.colors = cgColors
}
}
// 指针
private var needleView = AKNeedleView()
public var needleColor: UIColor = UIColor.white {
didSet {
needleView.color = needleColor
}
}
// 设置刻度
public var dashScale: CGFloat = 0.0 {
didSet {
setDashSacle(dashScale, animated: false)
}
}
convenience init() {
self.init(frame: CGRect.zero)
}
override init(frame: CGRect) {
super.init(frame: frame)
gradientLayer.mask = maskLayer
self.layer.addSublayer(gradientLayer)
shortScaleLayer.lineWidth = edgeSpacing / 4
self.layer.addSublayer(shortScaleLayer)
longScaleLayer.lineWidth = edgeSpacing / 3
self.layer.addSublayer(longScaleLayer)
self.layer.addSublayer(outEdgeLayer)
self.layer.addSublayer(inEdgeLayer)
needleView.layer.anchorPoint = CGPoint(x: 1, y: 0.5)
self.addSubview(needleView)
self.layer.addSublayer(longScaleTextLayer)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func layoutSubviews() {
super.layoutSubviews()
gradientLayer.frame = self.bounds
longScaleTextLayer.frame = self.bounds
resetAll()
}
// 重置Layer 及View
fileprivate func resetAll() {
resetLongScaleLayer()
resetLongScaleTextLayer()
resetShortScaleLayer()
let radius = frame.size.width / 2 > frame.size.height ?
frame.size.height - edgeWidth / 2: frame.size.width / 2 - edgeWidth / 2
maskLayer.path = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height), radius: radius - edgeWidth / 2 - edgeSpacing / 2, startAngle: CGFloat(Float.pi), endAngle: CGFloat(Float.pi * 2), clockwise: true).cgPath
outEdgeLayer.path = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height), radius: radius, startAngle: CGFloat(Float.pi), endAngle: CGFloat(Float.pi * 2), clockwise: true).cgPath
inEdgeLayer.path = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height), radius: radius - edgeWidth / 2 - edgeSpacing, startAngle: CGFloat(Float.pi), endAngle: CGFloat(Float.pi * 2), clockwise: true).cgPath
needleView.frame = CGRect(x: frame.size.width / 2 - radius + edgeSpacing - 2 * edgeWidth, y: frame.size.height - 15 / 2, width: radius - edgeSpacing + 2 * edgeWidth, height: 15)
}
fileprivate func resetLongScaleLayer() {
let radius = frame.size.width / 2 > frame.size.height ?
frame.size.height - edgeWidth / 2: frame.size.width / 2 - edgeWidth / 2
let longScaleRadius = radius - edgeWidth / 2 - edgeSpacing / 6
let C = CGFloat.pi * longScaleRadius
longScaleLayer.path = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height), radius: longScaleRadius, startAngle: CGFloat(Float.pi), endAngle: CGFloat(Float.pi * 2), clockwise: true).cgPath
longScaleLayer.lineDashPattern = [2, NSNumber(value: Float((C - CGFloat(2 * longScales)) / CGFloat(longScales - 1)))]
}
fileprivate func resetLongScaleTextLayer() {
if let sublayers = self.longScaleTextLayer.sublayers {
for sublayer in sublayers {
sublayer.removeFromSuperlayer()
}
}
let textSize: CGFloat = 12
let radius = frame.size.width / 2 > frame.size.height ?
frame.size.height - edgeWidth / 2: frame.size.width / 2 - edgeWidth / 2
let longScaleTextRadius = radius - edgeWidth / 2 - edgeSpacing / 6 - textSize
let angleSpacing = CGFloat.pi / CGFloat(longScales - 1)
var angle = CGFloat.pi
for index in 0 ..< longScales {
let textLayer = CATextLayer()
textLayer.foregroundColor = longScaleTextColor.cgColor
textLayer.fontSize = 10
textLayer.string = index >= longScaleTexts.count ? "" : longScaleTexts[index % longScaleTexts.count]
textLayer.allowsEdgeAntialiasing = true
textLayer.contentsScale = UIScreen.main.scale
textLayer.alignmentMode = kCAAlignmentCenter
let x = longScaleTextRadius * cos(angle)
let y = longScaleTextRadius * sin(angle)
textLayer.frame = CGRect(origin: CGPoint(x: self.frame.size.width / 2.0 + x - textSize / 2.0, y: self.frame.size.height + y - (index == 0 || index == longScales - 1 ? textSize : textSize / 2.0)), size: CGSize(width: 12, height: 12))
angle += angleSpacing
self.longScaleTextLayer.addSublayer(textLayer)
}
}
fileprivate func resetShortScaleLayer() {
let radius = frame.size.width / 2 > frame.size.height ?
frame.size.height - edgeWidth / 2: frame.size.width / 2 - edgeWidth / 2
let shortScaleRadius = radius - edgeWidth / 2 - edgeSpacing / 8
let C = CGFloat.pi * shortScaleRadius
let realShortScales = (longScales - 1) * (shortScales + 1) + 1
shortScaleLayer.path = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2, y: frame.size.height), radius: shortScaleRadius, startAngle: CGFloat(Float.pi), endAngle: CGFloat(Float.pi * 2), clockwise: true).cgPath
shortScaleLayer.lineDashPattern = [2, NSNumber(value: Float((C - CGFloat(2 * realShortScales)) / CGFloat(realShortScales - 1)))]
}
// MARK: 设置dashScale
public func setDashSacle(_ scale: CGFloat, animated: Bool) {
let realScale = scale > 1.0 ? 1.0 : (scale < 0 ? 0 : scale)
if animated {
let strokeAnim = CABasicAnimation(keyPath: "strokeEnd")
strokeAnim.duration = 0.25
strokeAnim.toValue = realScale
strokeAnim.fillMode = kCAFillModeForwards
strokeAnim.isRemovedOnCompletion = false
maskLayer.add(strokeAnim, forKey: "strokeEnd")
} else {
self.maskLayer.strokeEnd = realScale
}
let rotatedAnim = CABasicAnimation(keyPath: "transform.rotation")
rotatedAnim.duration = animated ? 0.25 : 0.01
rotatedAnim.toValue = realScale * CGFloat.pi
rotatedAnim.isRemovedOnCompletion = false
rotatedAnim.fillMode = kCAFillModeForwards
needleView.layer.add(rotatedAnim, forKey: "transform.rotation")
}
}
** 用法 **
let dashboardView = AKDashboardView(frame: CGRect(x: (UIScreen.main.bounds.size.width - 300) / 2.0, y: 200, width: 300, height: 150))
dashboardView.gradientColors = [UIColor.green, UIColor.orange, UIColor.red]
dashboardView.needleColor = UIColor.white
dashboardView.shortScaleColor = UIColor.white.withAlphaComponent(0.6)
dashboardView.shortScales = 5
dashboardView.longScales = 11
dashboardView.longScaleColor = UIColor.white
dashboardView.longScaleTexts = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"]
dashboardView.setDashSacle(0.8, animated: true)
