2017-12-29 189 views

Odpowiedz

4

Tworzenie niestandardowego formatowania:

class RandomCustomFormatter: NSObject, IValueFormatter { 

    convenience init(lineChart: LineChartView, xArray: [Double], yArray: [Double]) { 
     self.init() 

     var y = yArray 
     y.shuffle(count: y.count) 
     var dataEntries = [ChartDataEntry]() 
     var c = 0 
     for _ in xArray { 
     dataEntries.append(ChartDataEntry(x: xArray[c], y: y[c])) 
     c+=1 
     } 
     let theDataSet = LineChartDataSet(values: dataEntries, label: "Test Data") 
     print("dataentries shuffled: \(dataEntries)") 

     lineChart.data = LineChartData(dataSet: theDataSet) 


    } 


    public func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String { 
     let valueToUse = Int(value) 
     print("valuetouse: \(valueToUse)") 
     return String(valueToUse) 
    } 
} 

Dodaj rozszerzenie tablicy:

extension Array { 
    mutating func shuffle(count: Int) { 
     for _ in 0...count-1 { 
      sort { (_,_) in arc4random() < arc4random() } 
     } 
    } 
} 

ustawić formatowania:

//x datapoints 
let x = [1.0,2.0,3.0,4.0,5.0,6.0] 
//y datapoints 
var y = [8.0,16.0,23.0,63.0,66.0,323.0] 
let formatter = RandomCustomFormatter(lineChart: lineChart, xArray: x, yArray: y) 
self.lineChart?.data?.setValueFormatter(formatter) 

wynik 1:

result 1

Wynik 2:

result 2