來源:http://www.lxweimin.com/p/37a17fd7eb08
class GradientProgressController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.addSubview(self.progressView)
self.progressView.snp.makeConstraints { make in
make.top.equalTo(100)
make.width.height.equalTo(200)
}
}
//MARK: - lazy load -
private lazy var progressView: GradientCircleProgressView = {
let view = GradientCircleProgressView.init(frame: CGRect(x: 0, y: 0, width: 100, height: 100), lineWidth: 10, bgColor: UIColor(hex: "66D6D2").cgColor, colors: [UIColor(hex: "E73B14").cgColor, UIColor(hex: "E73B14").cgColor,UIColor(hex: "EC6A05").cgColor,UIColor(hex: "F9EE0C").cgColor], locations: [0.0, 0.5, 0.92, 1.0])
view.setProgress(0.9)
return view
}()
class GradientCircleProgressView: UIView {
private var bgColor: CGColor = UIColor(hex: "66D6D2").cgColor
private var lineWidth: CGFloat = 0.0
private var colors: [CGColor] = []
private var locations: [Double] = []
private var progress: CGFloat = 0.0
override init(frame: CGRect) {
super.init(frame: frame)
}
convenience init(frame: CGRect, lineWidth: CGFloat, bgColor: CGColor, colors: [CGColor], locations: [Double]) {
self.init(frame: frame)
self.bgColor = bgColor
self.lineWidth = lineWidth
self.colors = colors
self.locations = locations
draw(frame)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func draw(_ rect: CGRect) {
super.draw(rect)
self.circleLayer.removeFromSuperlayer()
self.gradientLayer.removeFromSuperlayer()
//畫一個環(huán)形的layer
self.circleLayer.frame = self.bounds
self.layer.addSublayer(self.circleLayer)
self.circleLayer.fillColor = UIColor.clear.cgColor
self.circleLayer.strokeColor = self.bgColor
self.circleLayer.opacity = 0.2
self.circleLayer.lineWidth = self.lineWidth
let center: CGPoint = CGPoint(x: rect.size.width/2, y: rect.size.height/2)
//畫貝塞爾曲線
let bezierPath = UIBezierPath(arcCenter: center, radius: (rect.size.width - self.lineWidth)/2, startAngle: CGFloat(-0.5 * Double.pi), endAngle: CGFloat(1.5 * Double.pi), clockwise: true)
self.circleLayer.path = bezierPath.cgPath //將曲線添加到layer層
self.layer.addSublayer(self.circleLayer)//添加蒙版
//漸變色 加蒙版 顯示蒙版區(qū)域
self.gradientLayer.frame = self.bounds
self.gradientLayer.colors = self.colors
self.gradientLayer.locations = self.locations as [NSNumber]
self.gradientLayer.startPoint = CGPoint(x: 0, y: 0)
self.gradientLayer.endPoint = CGPoint(x: 0, y: 1)
self.layer.addSublayer(self.gradientLayer)
self.progressLayer.frame = self.bounds
self.progressLayer.lineWidth = self.lineWidth
self.progressLayer.fillColor = UIColor.clear.cgColor
self.progressLayer.strokeColor = UIColor.red.cgColor
self.progressLayer.lineCap = .round //設(shè)置畫筆
self.progressLayer.path = bezierPath.cgPath
//修改漸變layer層的遮罩,關(guān)鍵代碼
self.gradientLayer.mask = self.progressLayer
}
public func setProgress(_ value: CGFloat, animated: Bool = false) {
self.progress = value
if animated {
CATransaction.begin()
CATransaction.setDisableActions(false)
CATransaction.setAnimationTimingFunction(CAMediaTimingFunction(name: .easeIn))
CATransaction.setAnimationDuration(1.0)
self.progressLayer.strokeEnd = self.progress
CATransaction.commit()
} else {
self.progressLayer.strokeEnd = self.progress
}
}
//MARK: - lazy load -
private lazy var circleLayer: CAShapeLayer = {
let layer = CAShapeLayer()
return layer
}()
private lazy var progressLayer: CAShapeLayer = {
let layer = CAShapeLayer()
layer.strokeEnd = 0.0
return layer
}()
private lazy var gradientLayer: CAGradientLayer = {
let layer = CAGradientLayer()
return layer
}()
}