iOS Charts , Swift 2.1.1 Xcode 7.2 seems doesn't work,

Question

I was trouble in 2 weeks, so please let me ask question.

Situation

XCode 7.2 Apple Swift version 2.1.1 (swiftlang-700.1.101.15 clang-700.1.81) https://github.com/yosuke1985/ios-charts

iOS Chart ttps://github.com/danielgindi/ios-charts

This code is from

ttp://www.appcoda.com/ios-charts-api-tutorial/

What I want

I want to use this framework, but error is EXEC_BAC_ACCESS,

I only put the window object on Viewcontroller by StoryBoard, and connect as BarChartView Class.

And wanna show Bar Chart, When I change the attribute, "noDataText" and "noDataTextDescription" It doesnt work, and cannot figure out the error comes from.

    barChartView.noDataText = "there is no data"
    barChartView.noDataTextDescription = "give me the reason"

Only these code doesn't work so, I start to think the problem is comes from version of Swift or XCode? Please give me advice to solve this problem.

error

EXEC_BAC_ACCESS ERROR, Screen Shot

import UIKit
import Charts

class ViewController: UIViewController {
var months: [String]!


@IBOutlet weak var barChartView: BarChartView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    barChartView.noDataText = "there is no data"
    barChartView.noDataTextDescription = "give me the reason"
    self.months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
    let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 4.0]

    setChart(months, values: unitsSold)
}


func setChart(dataPoints: [String], values: [Double]) {
    barChartView.noDataText = "You need to provide data for the chart."


    var dataEntries: [BarChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Units Sold")
    let chartData = BarChartData(xVals: months, dataSet: chartDataSet)
    barChartView.data = chartData
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


}

Answer 1

Solved. You need to set the Class of bar chart view to let the storyboard know which class to initialize. Custom class is empty now, which means it will be initialized as UIView and be use as BarChartView. See https://i.sstatic.net/uefli.png