完成前一条后如何多次绘制相同的贝塞尔曲线？

编程问答 2022-05-12

问题描述

我正在使用贝塞尔曲线路径、形状图层和 CABasicAnimation 以动画方式绘制视图。但它只绘制一次视图。完成前一条后如何多次绘制相同的贝塞尔曲线？

这是用于创建此类波形的附加代码。请检查...

enter image description here

class ViewController: UIViewController {

@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var graphView: UIView!

// MARK:- PROPERTIES
var movingPoint: CGFloat = 0.0
var startInterval: CGFloat = 10.0
var noOfIntervals: CGFloat = 0
var intervalWidth: CGFloat = 0
var pWaveWidth: CGFloat = 20.0
var qrsWaveWidth: CGFloat = 15
var tWaveWidth: CGFloat = 30
var gapBetweenTwoIntervals: CGFloat = 50
let shapeLayer = CAShapeLayer()
var bezierPath = UIBezierPath()
let animation = CABasicAnimation(keyPath: "strokeEnd")



override func viewDidLoad() {
    super.viewDidLoad()
    
    graphView.translatesAutoresizingMaskIntoConstraints = true
    graphView.frame.size = CGSize(width: 100000,height: 150)
    DispatchQueue.main.async {
        self.graphView.layoutIfNeeded()
    }
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    createGraph()
}


@objc func createGraph() {
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.strokeColor = UIColor.red.cgColor
    shapeLayer.lineWidth = 2.0
    _ = createBezierPath()
    graphView.layer.addSublayer(shapeLayer)
}

@discardableResult
@objc func createBezierPath(isPathAlreadyCreated: Bool = false) -> UIBezierPath {
    
    for _ in 0..<205 {
        let path = UIBezierPath()
        path.move(to: CGPoint(x: movingPoint,y: graphView.halfHeight))
        path.addLine(to: CGPoint(x: startInterval,y: graphView.halfHeight))
        
        // P Point Curve
        let pWaveX = startInterval + pWaveWidth
        path.addQuadCurve(to: CGPoint(x: pWaveX,y: graphView.halfHeight),controlPoint: CGPoint(x: pWaveX - 6.0,y: graphView.halfHeight - 30.0))
        
        let gapBetweenPAndQRS: CGFloat = 20.0
        path.addLine(to: CGPoint(x: (pWaveX + gapBetweenPAndQRS),y: graphView.halfHeight))
        
        // QRS
        let qrsStartPoint = pWaveX + gapBetweenPAndQRS
        let qrsComplex = qrsStartPoint + qrsWaveWidth
        let qrsComplexEndPoint = qrsComplex + (qrsWaveWidth / 2)
        path.addLine(to: CGPoint(x: qrsStartPoint + (qrsWaveWidth / 2),y: graphView.halfHeight - 70.0))
        path.addLine(to: CGPoint(x: qrsComplex,y: graphView.halfHeight + 40.0))
        path.addLine(to: CGPoint(x: qrsComplexEndPoint,y: graphView.halfHeight))
        
        let gapBetweenQRSAndTWave: CGFloat = 20.0
        let tWaveStartPoint = qrsComplexEndPoint + gapBetweenQRSAndTWave
        path.addLine(to: CGPoint(x: tWaveStartPoint,y: graphView.halfHeight))
        
        // T Point Curve
        let tWaveEndX = tWaveStartPoint + tWaveWidth
        print(tWaveEndX)
        path.addQuadCurve(to: CGPoint(x: tWaveEndX,controlPoint: CGPoint(x: tWaveEndX - 7.0,y: graphView.halfHeight - 30.0))
        
        movingPoint = tWaveEndX
        startInterval = tWaveEndX + gapBetweenTwoIntervals
        path.addLine(to: CGPoint(x: startInterval,y: graphView.halfHeight))
        bezierPath.append(path)
    }
    
    shapeLayer.path = bezierPath.cgPath
    
    animation.fromValue = 0.0
    animation.duration = 205 * 2
    shapeLayer.add(animation,forKey: "PathAnimation")
    
    return bezierPath
}

}

解决方法

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