iOS图表：值实际上是哪里？
我有以下 Xaxis 格式化程序：
extension ChartXAxisFormatter: IAxisValueFormatter {
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
guard let referenceTimeInterval = referenceTimeInterval,
let selectedFrame = selectedFrame
else {
return ""
}
let date = Date(timeIntervalSince1970: value * 3600 * 24 + referenceTimeInterval)
if(selectedFrame == .week) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "E"
return dateFormatter.string(from: date).capitalized
}
else if(selectedFrame == .month) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd"
return dateFormatter.string(from: date).capitalized
}
else {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM"
return dateFormatter.string(from: date).capitalized
}
}
}
我这样称呼它： xAxis.valueFormatter = ChartXAxisFormatter(referenceTimeInterval: referenceTimeInterval, selectedFrame: selectedFrame)
但是，这只是格式化值，它实际上并没有决定x 轴中出现哪些值。
当我运行它时，我得到类似的结果： 5 5 6 6 6 7
我可以通过设置 xAxis.capsularity = 1 来解决这个问题，但是我得到 5 6 而没有 7。
实际上决定出现什么值的是什么？我怎样才能获得唯一的值？
例如，如果我有权访问它使用的值，我可以调用类似 Array(Set(array)) 的内容
I have the following Xaxis formatter:
extension ChartXAxisFormatter: IAxisValueFormatter {
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
guard let referenceTimeInterval = referenceTimeInterval,
let selectedFrame = selectedFrame
else {
return ""
}
let date = Date(timeIntervalSince1970: value * 3600 * 24 + referenceTimeInterval)
if(selectedFrame == .week) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "E"
return dateFormatter.string(from: date).capitalized
}
else if(selectedFrame == .month) {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd"
return dateFormatter.string(from: date).capitalized
}
else {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "MMM"
return dateFormatter.string(from: date).capitalized
}
}
}
And I call it like so: xAxis.valueFormatter = ChartXAxisFormatter(referenceTimeInterval: referenceTimeInterval, selectedFrame: selectedFrame)
However, this is just formatting the values, it isn't actually deciding what values appear in the xAxis.
When I run it, I get something like: 5 5 6 6 6 7
I can fix this by setting xAxis.granularity = 1 but I get 5 6 without the 7.
What is actually deciding what values appear? How can I get just the unique values?
For example if I had access to what values it uses I can call something like Array(Set(array))
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请参阅图表库中的
xaxisRenderer。它具有computeaxisvalues函数，该功能实际上计算出显示在轴上的值。条目轴的数组存储将要显示的值。如果要格式化它，则必须对xaxisrenderer进行划分并覆盖
computeaxisvalues函数Refer to
XAxisRendererin the Charts library. It has acomputeAxisValuesfunction that actually calculates the values that appear on the axis. Theentriesarray of the axis stores the values that will be displayed.If you want to format it, you'll have to subclass the XAxisRenderer and override the
computeAxisValuesfunction