（2）样例代码

import UIKit
import Charts
 
class ViewController: UIViewController {
     
    //折线图
    var chartView: LineChartView!
     
    override func viewDidLoad() {
        super.viewDidLoad()
         
        //创建折线图组件对象
        chartView = LineChartView()
        chartView.frame = CGRect(x: 20, y: 80, width: self.view.bounds.width - 40,
                                 height: 300)
        self.view.addSubview(chartView)
         
        //生成20条随机数据
        var dataEntries = [ChartDataEntry]()
        for i in 0..<20 {
            let y = arc4random()%100
            let entry = ChartDataEntry.init(x: Double(i), y: Double(y))
            dataEntries.append(entry)
        }
        //这50条数据作为1根折线里的所有数据
        let chartDataSet = LineChartDataSet(values: dataEntries, label: "图例1")
        //目前折线图只包括1根折线
        let chartData = LineChartData(dataSets: [chartDataSet])
 
        //设置折现图数据
        chartView.data = chartData
    }
}

转载于：https://www.hangge.com/blog/cache/detail_2116.html