我想在图点中的 (1,2,3,4,5,6) 位置显示一些随机值,例如 (16,23,323,63,8,66)。我在图表框架中使用折线图。
是否有任何格式化程序可用于完成此操作?
上图显示了我想要绘制的示例图。
最佳答案
创建自定义格式化程序:
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)
}
}
添加数组扩展:
extension Array {
mutating func shuffle(count: Int) {
for _ in 0...count-1 {
sort { (_,_) in arc4random() < arc4random() }
}
}
}
设置格式化程序:
//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)
结果 1:
结果 2:
关于ios - 设置自定义数据集值 - 图表 3.0.4 和使用 Swift 4.0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48023702/