使用Charts实现图表

• Charts

• 界面展示

  
  界面展示.png

1. 使用pod将Charts导入项目中

2. 步骤

(1)新建视图

• 在故事版中拖入1个ViewController视图
• 在新视图中拖入2个View,垂直排布平分整个视图

• 选中其中一个View并之设置为BarChartView，另一个View为PieChartView

  
  BarChartView.png
  PieChartView.png

备注:设置View为BarChartView何PieChartView时，找不到BarChartView和PieChartView，原因可能是Charts导入项目后需要重新编译项目。

(2)创建视图对应的控制器文件MyChartViewController.swift
(3)视图和控制器绑定,并在控制器中添加视图中两个view控件的引用

添加控件的引用成功.png

2. 具体实现

(1)MyChartViewController.swift

//
//  MyChartViewController.swift
//  JackUChat
//
//  Created by 徐云 on 2019/1/16.
//  Copyright © 2019 Liy. All rights reserved.
//

import UIKit
import Charts

class MyChartViewController: UIViewController {

    @IBOutlet weak var barChartView: BarChartView!
    @IBOutlet weak var pieChartView: PieChartView!
    
    var months:[String]!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        months = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"]
        let percents = [20.0,18.0,25.0,19.0,16.0,20.0,17.0,17.0,15.0,21.0,20.0,13.0]
        setBarChart(dataPoints: months, values: percents)
        setPieChart(dataPoints: months, values: percents)
    }
    
    func setBarChart(dataPoints:[String],values:[Double]) {
        //barChartView.noDataText = "该处显示无数据时的显示文字,不设置则显示默认信息"
        
        var dataEntries:[BarChartDataEntry] = []
        for i in 0..<dataPoints.count {
            let dataEntry = BarChartDataEntry(x: values[i], y: Double(i))
            dataEntries.append(dataEntry)
        }
        let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
        let chartData = BarChartData(dataSet: chartDataSet)
        barChartView.data = chartData
        
        
    }
    
    func setPieChart(dataPoints:[String],values:[Double]) {
        var dataEntries:[PieChartDataEntry] = []
        for i in 0..<dataPoints.count {
            let dataEntry = PieChartDataEntry(value: values[i], label: months[i])
            dataEntries.append(dataEntry)
        }
        let chartDataSet = PieChartDataSet(values: dataEntries, label: "Units Sold")
        let chartData = PieChartData(dataSet: chartDataSet)
        pieChartView.data = chartData
        
        
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}