xcode swift 3 中的折线图
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Line Chart in swift 3
提问by Denis
Im trying to create a line chart with this code. I've laid out most of the code I've been messing around with it for hours trying different things. In class:
我正在尝试使用此代码创建折线图。我已经列出了大部分代码，我花了几个小时尝试不同的东西。在班上：
PendingViewController: UIViewController, ChartViewDelegate
Outlet:
出口：
@IBOutlet weak var lineChartView: LineChartView!
ViewDidLoad:
let months = ["Jan" , "Feb", "Mar", "Apr", "May", "June", "July", "August", "Sept", "Oct", "Nov", "Dec"]
let dollars1 = [1453.0,2352,5431,1442,5451,6486,1173,5678,9234,1345,9411,2212]
self.lineChartView.delegate = self
// 2
self.lineChartView.descriptionText = "Tap node for details"
// 3
self.lineChartView.chartDescription?.textColor = UIColor.white
self.lineChartView.gridBackgroundColor = UIColor.darkGray
// 4
self.lineChartView.noDataText = "No data provided"
// 5
setChartData(months: months)
Func:
功能：
func setChartData(months : [String]) {
// 1 - creating an array of data entries
var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
for i in 0 ..< months.count {
yVals1.append(ChartDataEntry(x: dollars1[i], y: Double(i)))
}
// 2 - create a data set with our array
let set1: LineChartDataSet = LineChartDataSet(values: yVals1, label: "First Set")
set1.axisDependency = .left // Line will correlate with left axis values
set1.setColor(UIColor.red.withAlphaComponent(0.5)) // our line's opacity is 50%
set1.setCircleColor(UIColor.red) // our circle will be dark red
set1.lineWidth = 2.0
set1.circleRadius = 6.0 // the radius of the node circle
set1.fillAlpha = 65 / 255.0
set1.fillColor = UIColor.red
set1.highlightColor = UIColor.white
set1.drawCircleHoleEnabled = true
//3 - create an array to store our LineChartDataSets
var dataSets : [LineChartDataSet] = [LineChartDataSet]()
dataSets.append(set1)
//4 - pass our months in for our x-axis label value along with our dataSets
let data: LineChartData = LineChartData(xVals: months, dataSets: dataSets)
data.setValueTextColor(UIColor.white)
//5 - finally set our data
self.lineChartView.data = data
}
Im receiving this error:
我收到此错误：
Cannot invoke initializer for typel 'LineChartData' with an argument list of type '(xVals: [String], dataSets: [LineChartDataSet])'
Thank You,
谢谢你，
Denis
丹尼斯
采纳答案by Joyful Machines
A hint for how you can figure out the overloads and I use all the time. In the "Find Navigator" in xCode you can search for "class LineChartData" -- then you can go examine the code in your pod where the "LineChartData" class is defined and see what arguments are in its init methods. Anyway, the answer I believe, base on this would be to change the line where you say:
关于如何找出重载的提示，我一直在使用。在 xCode 的“Find Navigator”中，您可以搜索“class LineChartData”——然后您可以检查 pod 中定义了“LineChartData”类的代码，并查看其 init 方法中有哪些参数。无论如何，我相信基于此的答案是更改您说的行：
let data: LineChartData = LineChartData(xVals: months, dataSets: dataSets)
to THIS
到这个
let data: LineChartData = LineChartData(dataSets: dataSets)
This matches the available overloads. If too late for you, above may help somebody else.
这匹配可用的重载。如果对你来说太晚了，上面可能会帮助别人。
回答by Sanjay Mali
Working code snippet: (Swift 3.0 and Chart 3.0)
工作代码片段：（Swift 3.0 和 Chart 3.0）
fileprivate func setChart(_ lineChartView: LineChartView, dataPoints: [Double], values: [Double]) {
var dataEntries: [ChartDataEntry] = []
for i in 0..<dataPoints.count {
let dataEntry = ChartDataEntry(x: Double(i), y: values[i])
dataEntries.append(dataEntry)
}
let lineChartDataSet = LineChartDataSet(values: dataEntries, label: "Altitude")
lineChartDataSet.setColor(UIColor.blue)
// lineChartDataSet.drawCubicEnabled = true
lineChartDataSet.mode = .cubicBezier
lineChartDataSet.drawCirclesEnabled = false
lineChartDataSet.lineWidth = 1.0
lineChartDataSet.circleRadius = 5.0
lineChartDataSet.highlightColor = UIColor.red
lineChartDataSet.drawHorizontalHighlightIndicatorEnabled = true
var dataSets = [IChartDataSet]()
dataSets.append(lineChartDataSet)
let lineChartData = LineChartData(dataSets: dataSets)
lineChartView.data = lineChartData
}
