ios 图表 - 寻找在 y 轴上创建自定义间隔的方法 - swift

ios charts - Looking for a way to make custom intervals on the y-axis - swift

我正在寻找一种在 ios 图表的 y 轴上设置自定义间隔的方法。因此,我正在寻找一种方法将步长更改为 60,而不是预先计算的 100 间隔。

而不是这个:

我正在寻找这个:

我使用 YAxisRenderer 解决了我自己的问题。我设置了自定义 YAxisRenderer 并更改了 computeAxisValues 函数以满足我自己的需要。这是我的代码:

import Charts

class TimelineYAxisRender: YAxisRenderer{
 /// Sets up the axis values. Computes the desired number of labels between the two given extremes.
    @objc open override func computeAxisValues(min: Double, max: Double)
    {
        super.computeAxisValues(min: min, max: max)

        guard let axis = self.axis else { return }

        let labelCount = axis.labelCount
        let range = max - min

        // Ensure stops contains at least n elements.
        axis.entries.removeAll(keepingCapacity: true)
        axis.entries.reserveCapacity(labelCount)

        let lowestHour = Int((min/60).rounded(.down))
        let highestHour = Int((max/60).rounded(.up))

        let rangeHour = highestHour - lowestHour

        switch range {
        case 160..<600:
            for i in 0...2 * rangeHour{
                axis.entries.append(Double(i) * 30 + Double(lowestHour * 60))
            }
        case 50..<160:
            for i in 0...4 * rangeHour{
                axis.entries.append(Double(i) * 15 + Double(lowestHour * 60))
            }
        case 15..<50:
            for i in 0...12 * rangeHour{
                axis.entries.append(Double(i) * 5 + Double(lowestHour * 60))
            }
        case 0..<15:
            for i in 0...60 * rangeHour{
                axis.entries.append(Double(i) + Double(lowestHour * 60))
            }
        default:
            for i in 0...8{
                axis.entries.append(Double(i) * 180)
            }
        }

    }
}

我的代码将左侧 y 轴设置为新的 YAxisRenderer:

let transformer = barChart.getTransformer(forAxis:.left)
let viewPortHandler = barChart.leftYAxisRenderer.viewPortHandler
barChart.leftYAxisRenderer = TimelineYAxisRender(viewPortHandler: viewPortHandler, yAxis: barChart.leftAxis, transformer: transformer)

我使用了舍入系统,所以我只会加载用户可以看到的图表部分的标签,因为加载每个标签会占用太多内存并导致模拟器卡顿。我还使用 max - min 来确定要加载哪些标签以创建平滑缩放。加载新标签的时间可以通过更改开关盒的参数来更改,缩放量可以通过更改实际附加到 axis.entries.

的内容来更改