Swift - 第三方图表库Charts使用详解17（散点图）

1，基本用法

import UIKit
import Charts

class ViewController: UIViewController {
    
    //散点图
    var chartView: ScatterChartView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //创建散点图组件对象
        chartView = ScatterChartView()
        chartView.frame = CGRect(x: 20, y: 80, width: self.view.bounds.width - 40,
                                 height: 260)
        self.view.addSubview(chartView)
        
        //第一组散点图的10条随机数据
        let dataEntries1 = (0..<10).map { (i) -> ChartDataEntry in
            let val = Double(arc4random_uniform(100) + 3)
            return ChartDataEntry(x: Double(i), y: val)
        }
        let chartDataSet1 = ScatterChartDataSet(values: dataEntries1, label: "图例1")
        
        //第二组散点图的10条随机数据
        let dataEntries2 = (0..<10).map { (i) -> ChartDataEntry in
            let val = Double(arc4random_uniform(100) + 3)
            return ChartDataEntry(x: Double(i), y: val)
        }
        let chartDataSet2 = ScatterChartDataSet(values: dataEntries2, label: "图例2")
        chartDataSet2.setColor(.orange) //第二组数据使用橙色
        
        //目前散点图包括2组数据
        let chartData = ScatterChartData(dataSets: [chartDataSet1, chartDataSet2])
        
        //设置散点图数据
        chartView.data = chartData
    }
}

2，修改散点的大小

chartDataSet1.scatterShapeSize = 5

3，设置散点中心部分的颜色和大小

chartDataSet1.scatterShapeHoleColor = .orange
chartDataSet1.scatterShapeHoleRadius = 2.5

4，散点的样式

chartDataSet1.setScatterShape(.circle) //使用圆形散点