如何使用 ios 图表设置 x 轴标签
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How to set x-axis labels with ios charts
提问by matt
I've recently started using the ios charts library and am having trouble finding information on how to manipulate the x-axis with the swift3 update.
我最近开始使用 ios 图表库，但无法找到有关如何使用 swift3 更新操作 x 轴的信息。
What I want to do is label the x-axis with time values, e.g. 2:03:00, 2:03:01, 2:03:02, etc. In the tutorials I find online, this seems to be very easy; many of them use months of the year as the x-axis label.
我想要做的是用时间值标记 x 轴，例如 2:03:00、2:03:01、2:03:02 等。在我在网上找到的教程中，这似乎很容易；他们中的许多人使用一年中的几个月作为 x 轴标签。
However, in the swift3 update, charts now initializes values with x and y values, and I am not sure how to use labels in this version of the library. Does anyone know how to create labels in charts with swift3?
但是，在 swift3 更新中，图表现在使用 x 和 y 值初始化值，我不确定如何在此版本的库中使用标签。有谁知道如何使用 swift3 在图表中创建标签？
回答by Shrestha Ashesh
Proper Solution for X-Axis String labels in Swift 3+
Swift 3+ 中 X 轴字符串标签的正确解决方案
let months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values:months)
barChartView.xAxis.granularity = 1
回答by Hamed
Create a class like this:
创建一个这样的类：
import Foundation
import Charts
@objc(BarChartFormatter)
class ChartFormatter:NSObject,IAxisValueFormatter{
var months: [String]! = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return months[Int(value)]
}
}
Set the x-Axis like this:
像这样设置 x 轴：
let xAxis=XAxis()
let chartFormmater=ChartFormatter()
for i in index{
chartFormmater.stringForValue(Double(i), axis: xAxis)
}
xAxis.valueFormatter=chartFormmater
chartView.xAxis.valueFormatter=xAxis.valueFormatter
回答by biloshkurskyi.ss
I propose to use more flexible and pretty solution. You should have a formatter class like this:
我建议使用更灵活和漂亮的解决方案。你应该有一个像这样的格式化程序类：
final class MonthNameFormater: NSObject, IAxisValueFormatter {
func stringForValue( _ value: Double, axis _: AxisBase?) -> String {
return Calendar.current.shortMonthSymbols[Int(value)]
}
}
Set up this type to your barChartView:
将此类型设置为您的barChartView：
barChartView.xAxis.valueFormatter = MonthNameFormater()
barChartView.xAxis.granularity = 1.0
As a result you will have: Jan, Feb, ..., DecIn addition if you want to change presentation kind you should change shortMonthSymbols with some other: monthSymbols, veryShortMonthSymbols, standaloneMonthSymbols
因此，您将拥有：Jan, Feb, ..., Dec此外，如果您想更改演示文稿类型，您应该将 shortMonthSymbols 更改为其他一些：monthSymbols, veryShortMonthSymbols, standaloneMonthSymbols
回答by MHCsk
Swift 4.2
斯威夫特 4.2
I'm having pretty good results using standard DateFormatter()I'm converting UNIX timestamp to format day.month
我使用标准得到了很好的结果DateFormatter()我正在将 UNIX 时间戳转换为格式 day.month
final class XAxisNameFormater: NSObject, IAxisValueFormatter {
func stringForValue( _ value: Double, axis _: AxisBase?) -> String {
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "dd.MM"
return formatter.string(from: Date(timeIntervalSince1970: value))
}
}
Usage:
用法：
self.lineChartView.xAxis.valueFormatter = XAxisNameFormater()
self.lineChartView.xAxis.granularity = 1.0
回答by Bhavesh Patel
You can do this by creating your own formatter for the time. Below I mention sample code for that for your reference.
您可以通过创建自己的格式化程序来做到这一点。下面我提到了示例代码供您参考。
public class DateValueFormatter: NSObject, AxisValueFormatter {
private let dateFormatter = DateFormatter()
override init() {
super.init()
dateFormatter.dateFormat = "HH:mm:ss"
}
public func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return dateFormatter.string(from: Date(timeIntervalSince1970: value))
}
}
To set your value just use below code.
要设置您的值，只需使用以下代码。
self.yourChart.xAxis.valueFormatter = DateValueFormatter()
self.yourChart.xAxis.granularity = 1.0
