I am using charts library and want to display a bar chart. I am facing issue for binding the data to the chart.This is my code.
class FirstViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
@IBOutlet weak var barChartView: BarChartView!
@IBOutlet weak var yearDropDown: UIPickerView!
@IBOutlet weak var rmDropDown: UIPickerView!
@IBOutlet weak var txtYear: UITextField!
@IBOutlet weak var txtRm: UITextField!
var months = [String]()
override func viewDidLoad() {
super.viewDidLoad()
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]
getYear()
setChart(dataPoints: months, values: unitsSold)
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func getYear()
{
url = RestMonitorServer.baseUrl + "/foo/bar"
Alamofire.request(url, method: .get, parameters: ["foo": bar,"foo":bar,"foo":bar])
.responseJSON(){
(response) in
print("get year list response ",response)
if ((response.result.value) != nil) {
let jsonData = JSON(response.result.value!)
if jsonData["duration"].arrayObject != nil {
self.durationArray.append("duration")
print("duration array ", self.durationArray)
}
} else if (((response.error)) != nil) {
let jsonError = response.error
print("Error in getting year list ", jsonError as Any)
}
}
}
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return durationArray.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if pickerView == yearDropDown {
let titleRow = durationArray[row]
return titleRow
}
return ""
}
func setChart(dataPoints: [String], values: [Double]) {
var dataEntries: [BarChartDataEntry] = []
for i in 0..<dataPoints.count {
let dataEntry = BarChartDataEntry(x:values[i],y:Double(i))
dataEntries.append(dataEntry)
}
print("data entries ",dataEntries)
let chartDataSet = BarChartDataSet(values: dataEntries, label: "Units Sold")
print("chart data set ", chartDataSet)
let chartData = BarChartData(dataSets: [chartDataSet])
print("chart data ",chartData)
barChartView.data = chartData //error at this line as fatal error: unexpectedly found nil while unwrapping an Optional value
print("bar chart data" , barChartView.data!)
}
}
This is my full code. And I am getting error for barChartView which I have initialised as above, but it still giving me error.
Thanks
As per my exp you need to move your function to BarChartView extension like below :
extension BarChartView {
func setBarChartData(xValues: [String], yValues: [Double], label: String) {
var dataEntries: [BarChartDataEntry] = []
for i in 0..<yValues.count {
let dataEntry = BarChartDataEntry(x: Double(i), y: yValues[i])
dataEntries.append(dataEntry)
}
let chartDataSet = BarChartDataSet(values: dataEntries, label: label)
let chartData = BarChartData(dataSets: [chartDataSet])
self.data = chartData
}
}
and Call it like below :
override func viewDidLoad() {
super.viewDidLoad()
barChartView.setBarChartData(xValues: months, yValues: unitsSold, label: "Monthly Sales")
}
Try this and let me know is it working or not.
Also one more thing you are setting static data of months & values my question is where are you filling server response data ?