Charts优秀图表第三方 swift4

柱状图的x轴文字设置方法变成使用代理

具体github.com/danielgindi/Charts/issues/1496

给出大致代码

Class ChartViewController : UIViewController, IAxisValueFormatter //step1, 遵守代理  {

    var xVals = [String]() // step2, Declare a global variable array for time

    override func viewDidLoad() {

        super.viewDidLoad()

        setupChartStyle() // step 3

    }

    func setupChartStyle() {

        combinedChartView.chartDescription?.text = ""

        combinedChartView.noDataText = "加载中..."

        combinedChartView...

        combinedChartView.xAxis.valueFormatter = self // Important statement, don't forgot this st.

    }

    func setChartData() { // set ChartData DataSource step 4 这一步配置x轴lable, 我没用

        for i in 0..

            xVals.append("Time string formatted") // In this step, you can format time strings.

        }

    }

    // return xVals value func

    stringForValue(_ value: Double, axis: AxisBase?) -> String {//实现代理方法xVals总的数组

        return xVals[Int(value) % xVals.count]

    }// OR

    func stringForValue(_ value: Double, axis: AxisBase?) -> String {

        return xVals[Int(value)]

    }

}

charts使用分组柱状图

stackoverflow.com/questions/35294076/how-to-make-a-grouped-barchart-with-ios-charts/35368184#35368184