lines not showing up

gistfile1.txt

import UIKit
import Alamofire
import SwiftCharts

class PressureSensorViewController: UIViewController {
    
    private var chart: Chart?
    
    @IBOutlet weak var lineChartView: ChartLinesView!
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        

        setChartData()
        
    }
    
    
    
    func setChartData(){
        
        let site = ActiveSite.sharedInstance.siteObject
        let url = "http://api.pivotrac.com:3000/pressure_sensors/recent_data_plots"
        var arrayOfPlotPoints: [(Double, Double)] = []
        
        var lowestDate: Double = 0
        var highestDate: Double = 0
        var lowestValue: Double = 0
        var highestValue: Double = 0
        
        Alamofire.request(.GET, url, parameters: ["id": site.pressureSensorID])
            .responseJSON { response in
                //print(response.result)   // result of response serialization
                
                // handle network problem
                switch response.result {
                case .Success(_):
                    print("success code back from api server for sites request")
                case .Failure(_):
                    let alertView = UIAlertController(title: "Connect Error", message: "Network error, please try again", preferredStyle: .Alert)
                    let alertAction = UIAlertAction(title: "OK", style: .Default) { _ in
                    }
                    alertView.addAction(alertAction)
                    self.presentViewController(alertView, animated: true) {}
                }
                
                if let jsonResult = response.result.value {
                    //print(response.result.value!)
                    
                    let arrayOfJSONDataPlots = JSON(jsonResult)
                    
                    for (key, item) in arrayOfJSONDataPlots {
                        var timestamp: Double = item[1].double!
                        let psi: Double = item[0].double! + 6.0
                        
                        // set the initial values for my comparison variables
                        if lowestDate == 0 {
                            lowestValue = psi
                            highestValue = psi
                            lowestDate = timestamp
                            highestDate = timestamp
                        }
                        
                        if highestValue > psi{
                           highestValue = psi
                        }
                        
                        if lowestValue < psi{
                           lowestValue = psi
                        }
                        
                        if timestamp < lowestDate{
                            lowestDate = timestamp
                        }
                        
                        if timestamp > highestDate {
                            highestDate = timestamp
                        }
                        
                        arrayOfPlotPoints.append((psi, timestamp))
                    }
                    
                    print("found lo psi = \(lowestValue) on \(lowestDate)")
                    print("found hi psi = \(highestValue) on \(highestDate)")
                    
                    
                }
                else {
                    print("JSON data is nil.")
                }
        } // end of json sites request
        
        let upperLimit: Double = 155.0
        let lowerLimit: Double = 0.0
        let width = lineChartView.bounds.width
        let height = lineChartView.bounds.height
        
        
        let chartConfig = ChartConfigXY(
            xAxisConfig: ChartAxisConfig(from: 0, to: 14, by: 2),
            yAxisConfig: ChartAxisConfig(from: 0, to: 15, by: 2)
        )
        
        let chart = LineChart(
            frame: CGRectMake(0, 70, 300, 500),
            chartConfig: chartConfig,
            xTitle: "X axis",
            yTitle: "Y axis",
            lines: [
                //(chartPoints: [(2.0, 10.6), (4.2, 5.1), (7.3, 3.0), (8.1, 5.5), (14.0, 8.0)], color: UIColor.redColor()),
                (chartPoints: arrayOfPlotPoints, color: UIColor.blueColor())
            ]
            
        )
        
        lineChartView.addSubview(chart.view)





    }
    
    
    
            
    
    

}