cp_first.swift

import UIKit
import CorePlot

class ViewController: UIViewController {
    
    var plotData = [Double](repeating: 0.0, count: 1000)
    @IBOutlet var graphView: CPTGraphHostingView!
 
    override func viewDidLoad() {
        super.viewDidLoad()
        initializeGraph()
    }
    
    func initializeGraph(){
        configureGraphtView()
    }
       
    func configureGraphtView(){
        graphView.allowPinchScaling = false
        self.plotData.removeAll()
        self.currentIndex = 0
                
        //Configure graph
        let graph = CPTXYGraph(frame: hostView.bounds)
        graph.plotAreaFrame?.masksToBorder = false
        hostView.hostedGraph = graph
        graph.backgroundColor = UIColor.black.cgColor
        graph.paddingBottom = 40.0
        graph.paddingLeft = 40.0
        graph.paddingTop = 30.0
        graph.paddingRight = 15.0
        
        //Style for graph title
        let titleStyle = CPTMutableTextStyle()
        titleStyle.color = CPTColor.white()
        titleStyle.fontName = "HelveticaNeue-Bold"
        titleStyle.fontSize = 20.0
        titleStyle.textAlignment = .center
        graph.titleTextStyle = titleStyle

        //Set graph title
        let title = "CorePlot"
        graph.title = title
        graph.titlePlotAreaFrameAnchor = .top
        graph.titleDisplacement = CGPoint(x: 0.0, y: 0.0)
    }
}

extension ViewController: CPTScatterPlotDataSource, CPTScatterPlotDelegate {
    func numberOfRecords(for plot: CPTPlot) -> UInt {
        return UInt(self.plotData.count)
    }

    func number(for plot: CPTPlot, field: UInt, record: UInt) -> Any? {     
       switch CPTScatterPlotField(rawValue: Int(field))! {
            case .X:
                return NSNumber(value: Int(record) + self.currentIndex-self.plotData.count)
            case .Y:
                return self.plotData[Int(record)] as NSNumber           
            default:
                return 0
        } 
    }
}