我使用ios图表来显示条形图。看起来像这样:
我想要的是红色框中的标签(对于所有的条形图,我只是不想经常重复这个......:P)。这意味着每个酒吧都有自己的标题"标签,以便用户看到每个值的类别名称。
另一个问题是:我添加的条形越多,条形越小。我可以以某种方式将BarChartView放入滚动视图,将条形的宽度设置为静态值,例如,还有20个值,用户只是向右滚动以查看更多值吗?
编辑代码:
func entries(for chart:ChartType, content:ChartContent, max:Int = Int.max)->[ChartDataEntry]{
let transactions = manager.transactions.value
let grouped = content == .category ? transactions.categorise({$1.category}) : transactions.categorise({$1.payee})
var entries:[ChartDataEntry] = []
let formatter = NumberFormatter()
formatter.locale = Locale.current
formatter.numberStyle = .currency
for i in 0..<grouped.count {
let c = Array(grouped.keys)[i]
let ts = grouped[c]!
var sum = 0.0
ts.forEach{k,t in
if t.expense{
sum += Double(t.value)
}
}
if chart == .pie{
let entry = PieChartDataEntry(value: sum, label: "\(c)")
if entries.count < max{
entries.append(entry)
}else{
entries.sort(by: {$0.0.y > $0.1.y})
break
}
}else if chart == .bar{
let entry = BarChartDataEntry(x: Double(i), y: sum, data: c as AnyObject?)
if entries.count < max{
entries.append(entry)
}else{
entries.sort(by: {$0.0.y > $0.1.y})
break
}
}
}
return entries
}
func showBarChart(content: ChartContent){
// Do any additional setup after loading the view.
let data = BarChartData()
let content = entries(for: .bar, content: content)
let ds1 = BarChartDataSet(values: content, label: "")
let xAxis=XAxis()
let chartFormmater = ChartFormatter()
chartFormmater.content = content as! [BarChartDataEntry]
for i in 0..<content.count{
chartFormmater.stringForValue(Double(i), axis: xAxis)
}
xAxis.valueFormatter=chartFormmater
barChartView.xAxis.valueFormatter=xAxis.valueFormatter
barChartView.xAxis.labelPosition = .bottom
ds1.colors = ChartColorTemplates.material()
data.addDataSet(ds1)
self.barChartView.data = data
self.barChartView.gridBackgroundColor = NSUIColor.white
self.barChartView.animate(xAxisDuration: 0.0, yAxisDuration: 1.0)
}
@objc(BarChartFormatter)
class ChartFormatter:NSObject,IAxisValueFormatter{
var content:[BarChartDataEntry]!
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
return content[Int(value)].data as! String
}
}
答案 0 :(得分:7)
你可以在下面的代码中实现,以解决这两个问题。
在下面的函数中,我传递了两个参数,即 dataPoints: x-Axis Labels,以及值:栏的值。它还解决了你的滚动问题。
func setChart(dataPoints: [String], values: [Float])
{
barChartView.noDataText = "You need to provide data for the chart."
for i in 1..<values.count
{
let dataEntry = BarChartDataEntry(x: Double(i), yValues: [Double(values[i])])
dataEntries.append(dataEntry)
}
let chartDataSet:BarChartDataSet!
let chartDataSet = BarChartDataSet(values: dataEntries, label: "BarChart Data")
let chartData = BarChartData(dataSet: chartDataSet)
barChartView.data = chartData
barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values: dataPoints)
barChartView.xAxis.granularityEnabled = true
barChartView.xAxis.drawGridLinesEnabled = false
barChartView.xAxis.labelPosition = .bottom
barChartView.xAxis.labelCount = 30
barChartView.xAxis.granularity = 2
barChartView.leftAxis.enabled = true
//barChartView.leftAxis.labelPosition = .outsideChart
//barChartView.leftAxis.decimals = 0
let minn = Double(values.min()!) - 0.1
barChartView.leftAxis.axisMinimum = Double(values.min()! - 0.1)
//barChartView.leftAxis.granularityEnabled = true
//barChartView.leftAxis.granularity = 1.0
//barChartView.leftAxis.labelCount = 5
barChartView.leftAxis.axisMaximum = Double(values.max()! + 0.05)
barChartView.data?.setDrawValues(false)
barChartView.pinchZoomEnabled = true
barChartView.scaleYEnabled = true
barChartView.scaleXEnabled = true
barChartView.highlighter = nil
barChartView.doubleTapToZoomEnabled = true
barChartView.chartDescription?.text = ""
barChartView.rightAxis.enabled = false
barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInOutQuart)
chartDataSet.colors = [UIColor(red: 0/255, green: 76/255, blue: 153/255, alpha: 1)]
}
OR
如何设置x轴标签?
从Swift 3.0.1开始,我们也可以这样做:
let labels = ["Value 1", "Value 2", "Value 3"]
barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values:labels)
//Also, you probably we want to add:
barChartView.xAxis.granularity = 1
希望它对你有所帮助。
答案 1 :(得分:2)
您可以在自己的课程中实施IAxisValueFormatter:
为此你只需要实现这个方法:
func stringForValue(_ value: Double, axis: AxisBase?) -> String
示例:
DefaultAxisValueFormatter - &gt;在这里,您可以使用块来添加自定义计算
或您关注RayWenderlich Tutorial "Using Realm and Charts with Swift 3 in iOS 10":
您必须设置一些代理人,但这是自定义格式化程序的关键代码段:
// MARK: axisFormatDelegate
extension ViewController: IAxisValueFormatter {
func stringForValue(_ value: Double, axis: AxisBase?) -> String {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = “HH:mm.ss”
return dateFormatter.string(from: Date(timeIntervalSince1970: value))
}
}
答案 2 :(得分:1)
要补充之前的答案,如果您想要显示所有值并且您有超过25个值,请记住在AxisBase.swift中修改LabelCount的硬编码限制,如下所示:
open var labelCount: Int
{
get
{
return _labelCount
}
set
{
_labelCount = newValue
// WHY?
// This limits the Amount of Labels We can Display: (Removing) -> Comment OUT
//
// if _labelCount > 25
// {
// _labelCount = 25
// }
// if _labelCount < 2
// {
// _labelCount = 2
// }
//
forceLabelsEnabled = false
}
}
我希望这有助于: - )
答案 3 :(得分:0)
回答你的第一个和第二个问题。我建议你做的是有一个侧滚动集合视图。在每个集合视图单元格中,您可以包含标题栏和值。这可以帮助你所有人重复尽可能多的图形,就像你要求你想要一个滚动视图。