Swift Charts – 更改X轴标签

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英文:

Swift Charts - changing the X axis literals

问题

I am moving my charts over from Daniel Gindi to Apple's Chart and haven't worked out how to control the X axis labels.

The X axis generates a daily angle from day 1 to 365 for the year, so is an integer. I want to display the months of the year, as shown in the previous version of the chart.

Swift Charts – 更改X轴标签

Is it possible to use .chartXScale for this purpose? I am not sure how to get it to accept strings or if I need to try a different approach.

var monthValues: [String] = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sept","Oct","Nov","Dec"]

Chart{
    ForEach(dayTilt) {item in
        LineMark(
        ...      
        )  
}
.frame(height: 360)
.chartXScale(domain: monthValues[0...11])
英文:

I am moving my charts over from Daniel Gindi to Apple's Chart and haven't worked out how to control the X axis labels.

The X axis generates a daily angle from day 1 to 365 for the year, so is an integer. I want to display the months of the year, as shown in the previous version of the chart.

Swift Charts – 更改X轴标签

Is it possible to use .chartXScale for this purpose? I am not sure how to get it to accept strings or if I need to try a different approach.

        var monthValues: [String] = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sept","Oct","Nov","Dec"]

        Chart{
            ForEach(dayTilt) {item in
                LineMark(
                ...      
                )  
        }
        .frame(height: 360)
        .chartXScale(domain: monthValues[0...11])

答案1

得分: 1

你可能应该存储一个Date而不是Int来表示日期,可以像这样修改代码:

struct DayTilt: Identifiable {
    
    internal init(day: Int, value: Float) {
        date = Calendar.current.date(from: DateComponents(day: day))!
        self.value = value
    }
    
    let id = UUID()
    let date: Date
    let value: Float
}

然后你可以使用以下的PlottableValue函数:

value(_:date:unit:calendar:)

例如:

struct ContentView: View {
    
    @State var dayTilts: [DayTilt] = 
    
    var body: some View {
        Chart(dayTilts) { dayTilt in
            LineMark(x: .value("Date", dayTilt.date, unit: .day),
                     y: .value("Angle", dayTilt.value))
        }
        .padding()
    }
}
英文:

You should probably store a Date rather than an Int for a day, so something like:

struct DayTilt: Identifiable {
    
    internal init(day: Int, value: Float) {
        date = Calendar.current.date(from: DateComponents(day: day))!
        self.value = value
    }
    
    let id = UUID()
    let date: Date
    let value: Float
}

then you can use the following PlottableValue

value(_:date:unit:calendar:)

e.g.

struct ContentView: View {
    
    @State var dayTilts: [DayTilt] = …
    
    var body: some View {
        Chart(dayTilts) { dayTilt in
            LineMark(x: .value("Date", dayTilt.date, unit: .day),
                     y: .value("Angle", dayTilt.value))
        }
        .padding()
    }
}

huangapple
  • 本文由 发表于 2023年2月14日 04:47:05
  • 转载请务必保留本文链接:https://go.coder-hub.com/75441021.html
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