更改条形图设计[iOS图表]

Question

我使用BarChartView的Charts创建了一个BarChart，但我无法弄清楚如何改变条形设计。

我正在使用的设计在图像的右侧看到，而我需要实现左侧设计。

@IBOutlet weak var charts: BarChartView!

charts.chartDescription?.enabled = false
charts.isUserInteractionEnabled = false
//charts.maxVisibleCount = 10
charts.drawBarShadowEnabled = false
charts.legend.enabled = false

let xAxis = charts.xAxis
xAxis.labelPosition = .bottom
xAxis.labelTextColor = .white
charts.xAxis.drawGridLinesEnabled = false
charts.rightAxis.drawGridLinesEnabled = false
charts.rightAxis.drawLabelsEnabled = false
charts.leftAxis.drawGridLinesEnabled = false
charts.leftAxis.drawLabelsEnabled = false
charts.leftAxis.axisMinimum = 0 ///
charts.rightAxis.axisMinimum = 0
charts.fitBars = true
charts.legend.textColor = .white

charts.setBarChartData(xValues: time, yValues: data, label: "Bar Chart")

任何帮助将不胜感激。

Answer 1

目前，无法以您想要的方式更改条形设计。

然而，有人通过更改网格线来绘制条形图但确实没有添加。 见：Added drawGridLinesOnTopEnabled boolean flag to draw grid lines on top of Bar Charts。 你可以查看他的作品here。

另一种手动解决方法，虽然不是最好的但是如果你绝对需要的话应该可以工作，就是在chartView（或任何其他UIView）的顶部放置一个透明的非透明线条视图

Example:

class HorizontalLines: UIView {        
    override func draw(_ rect: CGRect) {

        //number of parts to divide the height of view by
        let segments = 20

        //number of lines ignoring the bottom most line
        let numberOfLines = segments - 1

        //draw the lines from left to right
        for i in (1...numberOfLines).reversed() {
            let multiplier = CGFloat(i)/CGFloat(segments)
            let y = rect.size.height * multiplier
            let startPoint = CGPoint(x:0, y:y)
            let endPoint = CGPoint(x:rect.size.width, y:y)

            let aPath = UIBezierPath()
            aPath.move(to: startPoint)
            aPath.addLine(to: endPoint)
            aPath.close()

            //line width
            aPath.lineWidth = 1

            aPath.stroke()
            aPath.fill()
        }
    }
}

Usage:

let lineView = HorizontalLines()
lineView.isUserInteractionEnabled = false
lineView.backgroundColor = .clear

lineView.translatesAutoresizingMaskIntoConstraints = false
chartView.addSubview(lineView)

lineView.leadingAnchor.constraint(equalTo: chartView.leadingAnchor).isActive = true
lineView.trailingAnchor.constraint(equalTo: chartView.trailingAnchor).isActive = true
lineView.topAnchor.constraint(equalTo: chartView.topAnchor).isActive = true
lineView.bottomAnchor.constraint(equalTo: chartView.bottomAnchor).isActive = true

---

请注意，这将在chartView上显示的任何内容上划一条线。 因此，如果您决定显示条形数据标签，那么这些线条也将覆盖它。

我希望这能以某种方式帮助你:)