Реализация графика в приложении Stocks для iPhone - PullRequest
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Реализация графика в приложении Stocks для iPhone

0 голосов
/ 03 февраля 2019

Я пытаюсь реализовать простую версию «графика» в приложении для акций в iPhone (iOS 12).Особенно жест двумя пальцами, который используется для поиска изменения цены.

Я использовал UITouch и его метод TouchesMoved, но линии постоянно мерцают.

please see this image

Есть ли другой способ реализовать то же будущее без мерцающих линий.

код: 

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.lineLayer.path = UIBezierPath().cgPath
    self.lineLayerS.path = UIBezierPath().cgPath
    self.circleLayer.path = UIBezierPath().cgPath
    self.circleLayerS.path = UIBezierPath().cgPath
    var touch = touches
    if touches.count == 1{

        handleTouch(firstTouch: touch.popFirst()!, secondTouch: nil)
    } else if touches.count == 2{
        var tempF = touch.popFirst()
        var tempS = touch.popFirst()

        let tempFX = Int((tempF?.location(in: self).x)!)
        let tempSX = Int((tempS?.location(in: self).x)!)
        print(String(tempFX)+" "+String(tempSX))
        if tempFX > tempSX{
            swap(&tempF, &tempS)
        }

        if !((tempFX-Int((tempF?.majorRadius)!)...tempFX+Int((tempF?.majorRadius)!)~=tempSX)&&(tempSX-Int((tempS?.majorRadius)!)...tempSX+Int((tempS?.majorRadius)!)~=tempFX)){
            handleTouch(firstTouch: tempF!, secondTouch: tempS!)
        }
    }
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {

    if delegate != nil{
        delegate!.chartStopped()
    }
    self.lineLayer.path = UIBezierPath().cgPath
    self.lineLayerS.path = UIBezierPath().cgPath
    self.circleLayer.path = UIBezierPath().cgPath
    self.circleLayerS.path = UIBezierPath().cgPath

}

private func handleTouch(firstTouch fT:UITouch, secondTouch sT:UITouch?){

    let loc1 = fT.location(in: self)
    let xRawValue1 = getClosest(searchValue: Int(loc1.x), arrayValue: self.xRaw)
    let yRawValue1 = self.yRaw[self.xRaw.index(of: xRawValue1)!]
    self.date = self.x[self.xRaw.index(of: xRawValue1)!]
    self.price = self.y[self.xRaw.index(of: xRawValue1)!]
    drawLines(xRawValue: xRawValue1, yRawValue: yRawValue1,lineLayer: lineLayer,circleLayer: circleLayer)
    //self.lineLayerS.path = UIBezierPath().cgPath
    //self.circleLayerS.path = UIBezierPath().cgPath
    if delegate != nil{
        delegate!.chartMoved(currentPrice: self.price, currentDate: self.date)
    }

    if let locT = sT{
        let loc2 = locT.location(in: self)
        let xIndex1 = self.xRaw.index(of: xRawValue1)!
        let xRawValue2 = getClosest(searchValue: Int(loc2.x), arrayValue: self.xRaw)
        let xIndex2 = self.xRaw.index(of: xRawValue2)!
        let yRawValue2 = self.yRaw[xIndex2]
        var averageSum = 0.0
        for i in xIndex1..<xIndex2{
            averageSum += Double(self.y[i])
        }
        averageSum = averageSum/Double(xIndex2-xIndex1)
        self.date = self.x[xIndex1]+"-"+self.x[xIndex2]
        self.price = Float(averageSum)
        if delegate != nil{
            delegate!.chartMoved(currentPrice: self.price, currentDate: self.date)
        }
        drawLines(xRawValue: xRawValue2, yRawValue: yRawValue2,lineLayer: lineLayerS,circleLayer: circleLayerS)

    }
}


private func drawLines(xRawValue xV:Int,yRawValue yV:Int,lineLayer:CAShapeLayer,circleLayer:CAShapeLayer){
    let line = UIBezierPath(rect: CGRect(x: xV, y:0, width: 1, height: Int(self.frame.height)))
    lineLayer.path = line.cgPath
    lineLayer.strokeColor = UIColor.black.cgColor
    circleLayer.path = UIBezierPath(ovalIn: CGRect(x: xV-4, y: yV-4, width: 8, height: 8)).cgPath;
    circleLayer.strokeColor = Colors.blueDark.cgColor
    circleLayer.fillColor = Colors.blueDark.cgColor
    self.layer.addSublayer(circleLayer)
}
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