iOS Chart errors due to no documentation

Question

I want to include Charts on a section of my side project. I struggle to get their demo working. I do not know Objective C so I've converted their code to Swift. Im using Swift 3:

viewDidLoad():

self.title = "Filled Line Chart"
    self.chartView.delegate = self // after build: Thread 1:EXC_BAD_ACCESS (code=2, address=0x……)
    self.chartView.backgroundColor = UIColor.white
    self.chartView.gridBackgroundColor = UIColor(red: CGFloat(51 / 255.0), green: CGFloat(181 / 255.0), blue: CGFloat(229 / 255.0), alpha: CGFloat(150 / 255.0))
    self.chartView.drawGridBackgroundEnabled = true
    self.chartView.drawBordersEnabled = true
    self.chartView.chartDescription.isEnabled = false
    self.chartView.pinchZoomEnabled = false
    self.chartView.dragEnabled = true
    chartView.scaleEnabled = true
    var l = chartView.legend
    l.isEnabled = false
    var xAxis = chartView.xAxis
    xAxis.isEnabled = false
    var leftAxis = chartView.leftAxis
    leftAxis.axisMaximum = 900.0
    leftAxis.axisMinimum = -250.0
    leftAxis.drawAxisLineEnabled = false

Since I dont know what to do from there, I dragged a line from my view to the code to create an IBOutlet: @IBOutlet var chartView: BarChartView!

In all it looks like this:

import UIKit
import Charts

class DashboardVC: UIViewController, ChartViewDelegate {

  @IBOutlet var chartView: BarChartView!

  override func viewDidLoad() {
    super.viewDidLoad()

self.title = "Filled Line Chart"
        self.chartView.delegate = self
        self.chartView.backgroundColor = UIColor.white
        self.chartView.gridBackgroundColor = UIColor(red: CGFloat(51 / 255.0), green: CGFloat(181 / 255.0), blue: CGFloat(229 / 255.0), alpha: CGFloat(150 / 255.0))
        self.chartView.drawGridBackgroundEnabled = true
        self.chartView.drawBordersEnabled = true
        self.chartView.chartDescription?.isEnabled = false
        self.chartView.pinchZoomEnabled = false
        self.chartView.dragEnabled = true
        self.chartView.scaleXEnabled = true
        var l = chartView.legend
        l.isEnabled = false
        var xAxis = chartView.xAxis
        xAxis.isEnabled = false
        var leftAxis = chartView.leftAxis
        leftAxis.axisMaximum = 900.0
        leftAxis.axisMinimum = -250.0
        leftAxis.drawAxisLineEnabled = false
  }
}

Error I got with above:

The aim was to add a chart in a small container on my view but just to see of this moule works, I select the entire view to create the outlet. I see not documentation. I've looked on youtube for videos, searched for tutorials for this module but nothing. Spent 2hrs looking and so far no good. Would appreciate any little input.

Thanks.

EDIT:

As per comments/answer, Ive changed isEnabled to enable. Only one error, Thread 1:EXC_BAD_ACCESS. The fix brought me to this.

This simple question gets longer as when I made the change but selecting Charts for Module, I get the above error which points to my custom segue:

func goTodashboard() {

        let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)

        let dc: DashboardVC = storyboard.instantiateViewController(withIdentifier: "dashboardVC") as! DashboardVC

        self.present(dc, animated: true, completion: nil)

    }

Basically, that code is called in viewDidAppear() from loginViewController. When user logs in, it goes to the dashboard. Is that the correct way to switch view? It works ok but the Charts having an issue with it.

you can find the official documentation at github.com/PhilJay/MPAndroidChart/wiki to resolve your errors simply use enabled instead of isEnabled — Tobi
– Tobi, Commented Dec 22, 2016 at 7:12
i suggest you take a closer look at segues and the prepare-method, that may resolve the bad access. Did you set the correct class to your uiview(barChart) in the storyboard? — Tobi
– Tobi, Commented Dec 22, 2016 at 7:58
@Tobi Thats where Im lost. I only have LoginVC and DashboardVC. — Sylar
– Sylar, Commented Dec 22, 2016 at 8:03
i would, without knowing more of your structure, call performSegue(withIdentifier: "Your Identifier", sender: /*login-button*/) after the login is proven correct and put all the other stuff in the prepare-method or wire up everything in the storyboard and disable the segue if login data are incorrect — Tobi
– Tobi, Commented Dec 22, 2016 at 8:08

CodeChanger · Accepted Answer · 2016-12-22 07:30:56Z

1

As I have observed that you need to hide description & legends so you are changing wrong property of Charts framework use below property for enable / disable description.

self.chartView.chartDescription?.enabled = false

let l  = chartView.legend as Legend
l.enabled = false

let xAxis = chartView.xAxis
xAxis.enabled = false

isEnable is a readonly property to check that feature is enable or not and its returning YES/NO.

Hope this will helps you.

answered Dec 22, 2016 at 7:30

CodeChanger

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Comments

Tobi · Accepted Answer · 2016-12-22 09:35:01Z

0

To narrow down the solution from my comments you can find the official documentation for the Charts framework here

the isEnabled-Methods are getter, the corresponding setter method is enabled

instead of using a custom segue-function try to use the build-in prepare-method, you can call it programmatically with performSegue(withIdentifier: "Your Identifier", sender: /*login-button*/) after you validated the login as correct

make sure you set the right class to the UIView that displays your chart (in storyboard select the view and go to the identity inspector > enter 'BarChartView' in the Class property and 'Charts' in the Module property)

after everything works, you need to provide data to your chart:

let me give you an example

let data = Utils().getData()               
var dataEntries: [ChartDataEntry] = []

for i in 0..<data.count
{
  let dataEntry = ChartDataEntry(x:Double(data[i].xValue), y:Double(data[i].yValue))
  dataEntries.append(dataEntry)
}

let chartDataSet = BarChartDataSet(values: dataEntries, label: "Label")  
let chartData = BarChartData(dataSets: [chartDataSet])            
self.barChart.data = chartData

everything should be set up and working now

edited Dec 22, 2016 at 9:35

answered Dec 22, 2016 at 9:09

Tobi

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4 Comments

Sylar Over a year ago

Ok I'll try this out later. Thanks

Sylar Over a year ago

What is Utils()?

Tobi Over a year ago

An example Classobject, from where you get your chart data belongs to you .. you could also hardcode them, read them from a database or receive them from a server ... it's up to you

Sylar Over a year ago

Ok this worked but...not really "usable" as when I change graph types I get errors. However, what you've given works with LineChart and I'll accept. Thank you.

Jiang Yufeng · Accepted Answer · 2016-12-22 07:21:22Z

0

isEnable is Getting funcation ,can not be use for Setting. please use

xAxis.enable = false

answered Dec 22, 2016 at 7:21

Jiang Yufeng

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