How can I hide 0 values on ios-chart? - ios

Question

I know that it is possible to hide y values when their values are equal to 0 on MPAndroidChart using a custom class for your value formatter (MPAndroidChart: Hide 0 value labels in a stacked bar chart).
Despite this, I am not able to create the same class on Swift 3.0 or get any other way to do this. I tried to "translate" the custom class from Java to Swift 3.0 without success (I can copy the code of what I have tried if you want but it is full of errors).
Is it possible to hide y values when they are equals to 0 on ios-chart library?
P.S: I am using Swift 3.0.
Thanks in advance!

Answer 1

I made it happen on a PieChart in one of my apps just like that :
...
let dataSet = PieChartDataSet(yVals: yVals, label: nil)
// This is where the magic happen
// You set a NSNumberFormatter with an empty zero Symbol
let noZeroFormatter = NumberFormatter()
noZeroFormatter.zeroSymbol = ""
dataSet.valueFormatter = ChartDefaultValueFormatter(formatter: noZeroFormatter)
let chartData = PieChartData(xVals: xVals, dataSet: dataSet)
...

Answer 2

if you want to add % in in your graph as well as hide/remove 0.0 values from graph :
used below lines of code for # Swift 3:-
func updateChartData() {
let chart = PieChartView(frame: mViewOutlet.frame)
// let chart = PieChartView(frame: CGRect(x: 122, y: 235 , width: self.mViewOutlet.frame.size.width, height: self.mViewOutlet.frame.size.height))
// 2. generate chart data entries
let track = ["Present","Leave", "EG/LC", "Halfday", "Absent", "Weeklyoff", "Holidays"]
// let money = [65, 13, 10, 2]
let money = mDaysArray
var entries = [PieChartDataEntry]()
for (index, value) in money.enumerated() {
print("index: \(index) \n value: \(value)")
let entry = PieChartDataEntry()
if value != 0 {
entry.y = Double(value)
}else{
}
entries.append(entry)
// entry.label = track[index] // if we want to remove name label
}
// 3. chart setup
let set = PieChartDataSet( values: entries, label: "Pie Chart")
// this is custom extension method. Download the code for more details.
//4. set chart color
let presentColor = UIColor(red: 80.0/255.0, green: 180.0/255.0, blue: 50.0/255.0, alpha: 1.0)
// let lateColor = UIColor(red: 241.0/255.0, green: 194.0/255.0, blue: 114.0/255.0, alpha: 1.0)
let leaveColor = UIColor(red: 203.0/255.0, green: 68.0/255.0, blue: 242.0/255.0, alpha: 1.0)
let egColor = UIColor(red: 95.0/255.0, green: 180.0/255.0, blue: 239.0/255.0, alpha: 1.0)
let halfdayColor = UIColor(red: 82.0/255.0, green: 64.0/255.0, blue: 152.0/255.0, alpha: 1.0)
let absentColor = UIColor(red: 242.0/255.0, green: 58.0/255.0, blue: 02.0/255.0, alpha: 1.0)
let weekOffColor = UIColor(red: 186.0/255.0, green: 221.0/255.0, blue: 79.0/255.0, alpha: 1.0)
let holidayColor = UIColor(red: 35.0/255.0, green: 215.0/255.0, blue: 179.0/255.0, alpha: 1.0)
let colors: [UIColor] = [presentColor,leaveColor,egColor,halfdayColor,absentColor,weekOffColor,holidayColor]
set.colors = colors
let data = PieChartData(dataSet: set)
let formatter = NumberFormatter()
formatter.numberStyle = .percent
formatter.maximumFractionDigits = 2
formatter.multiplier = 1.0
formatter.percentSymbol = "%"
formatter.zeroSymbol = ""
data.setValueFormatter(DefaultValueFormatter(formatter: formatter))
chart.data = data
chart.noDataText = "No data available"
chart.usePercentValuesEnabled = true
// user interaction
chart.isUserInteractionEnabled = false
let d = Description()
// d.text = "iOSCharts.io"
chart.chartDescription = d
// chart.tintColor = UIColor.black
// chart.centerText = "Pie Chart"
chart.holeRadiusPercent = 0.2
chart.chartDescription?.enabled = false
chart.legend.enabled = false
chart.data?.notifyDataChanged()
chart.notifyDataSetChanged()
chart.setNeedsDisplay()
chart.animate(xAxisDuration: 1.3, yAxisDuration: 1.3)
chart.transparentCircleColor = UIColor.clear
// self.view.addSubview(chart)
self.mPieChartMainView.addSubview(chart)
}

Answer 3

let data = PieChartData(dataSet: set)
let pFormatter = NumberFormatter()
pFormatter.numberStyle = .none
pFormatter.zeroSymbol = "";
pFormatter.maximumFractionDigits = 1
pFormatter.multiplier = 1
pFormatter.percentSymbol = ""
data.setValueFormatter(DefaultValueFormatter(formatter: pFormatter))