Swift Charts3.0的使用---柱状图

一个很好的图表制作第三方框架的使用：Charts

柱状图 BarChatView，创建如下图的效果

• 初始化并进行一些配置的设置

// 柱状图
    let barChartView = BarChartView().then {
        
        $0.noDataText = "暂无统计数据" //无数据的时候显示
        
        $0.chartDescription?.enabled = false //是否显示描述
        $0.pinchZoomEnabled = true
        $0.drawBarShadowEnabled = true 
        $0.drawGridBackgroundEnabled = true
        
        let xAxisFormatter = NumberFormatter()
        xAxisFormatter.minimumFractionDigits = 0
        xAxisFormatter.maximumFractionDigits = 1
        xAxisFormatter.negativePrefix = "月"
        xAxisFormatter.positiveSuffix = "月"
        
        //chart设置,x轴设置， 相应的可以设置左侧，右侧y轴
        let xAxis = $0.xAxis
        xAxis.labelPosition = .bottom //x轴的位置
        xAxis.labelFont = .systemFont(ofSize: 10)
        xAxis.drawGridLinesEnabled = false
        xAxis.granularity = 1.0
        //        xAxis.labelCount = 12
        xAxis.valueFormatter = DefaultAxisValueFormatter(formatter: xAxisFormatter)
        
        $0.leftAxis.drawGridLinesEnabled = false //左侧y轴设置，不画线
        $0.leftAxis.axisMinimum = 0.0 //最小数据
        $0.rightAxis.drawGridLinesEnabled = false //右侧y轴设置，不画线
        $0.rightAxis.axisMinimum = 0.0
         //下方的说明
        $0.legend.enabled = true
        let legend = $0.legend
        legend.horizontalAlignment = .left
        legend.verticalAlignment = .bottom
        legend.orientation = .horizontal
        legend.drawInside = false
        legend.form = .square
        legend.formSize = 9.0
        legend.font = .systemFont(ofSize: 10)
        legend.xEntrySpace = 4.0

    }

• 添加到视图中

self.contentView.addSubview(self.barChartView)
self.barChartView.snp.makeConstraints {
       $0.centerX.equalToSuperview()
       $0.width.height.equalTo(screeW-20)
       $0.top.equalTo(self.segcontrol.snp.bottom).offset(10)
}
self.setBarChartViewData(withModel: model)

• 设置图标的数据

    /// 设置柱状图数据
    ///
    /// - Parameter model: 数据
    func setBarChartViewData(withModel model: ChartModels) {
        
        let charArray = model.chatDatas
        
        var dataEntris = [BarChartDataEntry]()
        for chart in charArray {
            
            let dataEntry = BarChartDataEntry(x: Double(chart.month), y: Double(chart.count))
            dataEntris.append(dataEntry)
        }
        
        let chartDataSet = BarChartDataSet(values: dataEntris, label: "发布数/月份")
        chartDataSet.colors = [NavbarColor]
        
        let chartData = BarChartData(dataSet: chartDataSet)
        self.barChartView.data = chartData
        self.barChartView.animate(yAxisDuration: 1.0, easingOption: .easeInBack)
    }