无法使图表对象在自定义UIView中工作

Question

我正在使用Daniel Gindi的图表库（ios图表），为了简单起见，我使用自定义UIView来存储图表视图（作为ChartViewBase）。我有一个View Controller类的类层次结构，其中leaf类具有对其中包含ChartViewBase的UIView的引用。问题是图表拒绝显示，我得到的只是图表应该是的黑色矩形。我想代码可能是最有用的，所以这里什么都没有：通用的UIView图表保持类：

import UIKit
import Charts

protocol GenericChartViewDelegate: class {
func backButtonTapped()
func switchChartButtonTapped()
func finalizeResultsButtonTapped()
}

class GenericChartView: UIView, ChartViewDelegate
{

@IBOutlet weak var headerDisplay: UIButton!
@IBOutlet var view: UIView!
weak var delegate: GenericChartViewDelegate?
required init?(coder aDecoder: NSCoder)
{
    super.init(coder: aDecoder)
    Bundle.main.loadNibNamed("GenericChartView", owner: self, options: nil)
    self.addSubview(self.view)
    chart.delegate = self
}
override init(frame: CGRect)
{
    super.init(frame: frame)
    Bundle.main.loadNibNamed("GenericChartView", owner: self, options: nil)
    self.addSubview(self.view)
    chart.delegate = self
}
@IBOutlet var chart: ChartViewBase!
@IBAction func BackButton(_ sender: UIButton) {
    delegate?.backButtonTapped()
}

@IBAction func SwitchChartButton(_ sender: UIButton) {
    delegate?.switchChartButtonTapped()
}

@IBAction func FinalizeResultsButton(_ sender: UIButton) {
    delegate?.finalizeResultsButtonTapped()
}
func setHeader(header: String)
{
    headerDisplay.setTitle(header, for: UIControlState.normal)
    headerDisplay.layer.cornerRadius = MyVariables.borderCurvature
    headerDisplay.titleLabel?.adjustsFontSizeToFitWidth = true

}
}

现在基础图表视图控制器：

class ChartViewControllerBase: UIViewController
{

var myColors : [NSUIColor] = []
//var bounds : CGRect!
override func viewDidLoad() {
    super.viewDidLoad()
    let sessionCount = ShareData.sharedInstance.currentSessionNumber
    //NotificationCenter.default.addObserver(self, selector: "rotated", name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
    createChart()
    var myBase = getChartObject()

    var myChartView = getChartDisplayView()
    setDelegate()
    if let myName = ShareData.sharedInstance.currentAccount.name {//sessionName.characters.last!
        let myTitle = "Session " + "(sessionCount)" + " Results - " + myName

        myChartView.setHeader(header: myTitle)
    }

    //chartOriginalBounds = chart.bounds
    if let resultChoice = ShareData.sharedInstance.sessionDataObjectContainer[ShareData.sharedInstance.currentAccountSessionNames[sessionCount - 1]]?.chartInfo
    {
        makeChart(resultChoice: resultChoice)
    }

    // Do any additional setup after loading the view.
}

func setDelegate()
{

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func createChart()
{

}
func getChartDisplayView() -> GenericChartView
{
    return GenericChartView(frame: self.view.bounds)
}

func getChartObject() -> ChartViewBase
{
    return ChartViewBase()
}

func makeChart(resultChoice: chartData)
{

}

func getColors(value: Double)
{

}

func getChartDataEntry(xval: Double, yval: Double) -> ChartDataEntry
{
    return ChartDataEntry(x: xval, y: yval)
}
}

现在LineAndBarChart代码：

class LineAndBarChartViewControllerBase: ChartViewControllerBase {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func getChartObject() -> ChartViewBase
{
    return ChartViewBase()
}
var yAxis: YAxis!

func setYAxisFormatter() {

}

func createSet(myEntries: [ChartDataEntry])
{

}



override func makeChart(resultChoice: chartData)
{
    let chart = getChartObject() as! BarLineChartViewBase
    chart.chartDescription?.enabled = false
    chart.drawGridBackgroundEnabled = false
    chart.dragEnabled = true
    chart.setScaleEnabled(true)
    chart.pinchZoomEnabled = true
    let xAxis = chart.xAxis
    xAxis.labelPosition = XAxis.LabelPosition.bottom
    chart.rightAxis.enabled = false
    xAxis.drawGridLinesEnabled = false
    xAxis.drawAxisLineEnabled = true
    xAxis.granularity = 1.0


    //xAxis.setValuesForKeys(<#T##keyedValues: [String : Any]##[String : Any]#>)
    yAxis = chart.leftAxis
    chart.rightAxis.enabled = false
    chart.legend.enabled = true
    yAxis.granularity = 1.0
    yAxis.drawGridLinesEnabled = false
    var counter = 1.0
    var myEntries : [ChartDataEntry] = []

    var myXValues : [String] = []


    if !resultChoice.plotPoints.isEmpty
    {
        for var item in resultChoice.plotPoints
        {
            let timeString : String =
                {
                    let formatter = DateFormatter()
                    formatter.dateFormat = "h:mm a"
                    formatter.amSymbol = "AM"
                    formatter.pmSymbol = "PM"
                    return formatter.string(from: item.xValue)
            }()
            myXValues.append(timeString)
            /*if(item.showXValue)
             {
             myXValues.append(timeString)
             }
             else
             {
             myXValues.append("")
             }*/
            let myEntry = getChartDataEntry(xval: counter, yval: Double(item.yValue))
            getColors(value: myEntry.y)

            counter += 1
            myEntries.append(myEntry)

        }
        let myFormatter = MyXAxisValueFormatter(values: myXValues)

        xAxis.valueFormatter = myFormatter
        setYAxisFormatter()
        createSet(myEntries: myEntries)

    }

}
}

class MyXAxisValueFormatter: NSObject, IAxisValueFormatter {

var mValues: [String]

init(values: [String]) {
    self.mValues = values;
}


func stringForValue( _ value: Double, axis: AxisBase?) -> String
{
    // "value" represents the position of the label on the axis (x or y)
    let myVal: Int = Int(value)
    if (myVal < mValues.count)
    {
        return mValues[myVal];
    }
    else
    {
        return "ERROR"
    }
}
}

然后条形图基本代码：

class BarChartViewControllerBase: LineAndBarChartViewControllerBase {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}



override func createChart()
{
    var myChart = getChartDisplayView()
    myChart.chart = BarChartView(frame: myChart.chart.contentRect)
}

override func createSet(myEntries: [ChartDataEntry])
{
    let chart = getChartObject() as! BarChartView
    let mySet = BarChartDataSet(values: myEntries, label: "Values")
    mySet.colors = myColors
    mySet.valueColors = myColors
    setValueFormatter(set: mySet)

    let myBarChartData = BarChartData(dataSet: mySet)
    myBarChartData.barWidth = 0.8
    chart.data = myBarChartData
}

func setValueFormatter(set: BarChartDataSet)
{

}


override func getChartDataEntry(xval: Double, yval: Double) -> ChartDataEntry
{
    return BarChartDataEntry(x: xval, y: yval)
}
}

最后，叶子（大多数派生类）代码：

class DerivedClassChartViewController: BarChartViewControllerBase, GenericChartViewDelegate
{


@IBOutlet weak var chartView: GenericChartView!
override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


override func getChartDisplayView() -> GenericChartView
{
    return chartView
}

override func getChartObject() -> ChartViewBase
{
    return chartView.chart
}

override func getColors(value: Double)
{
    if (value == 0.0)
    {
        myColors.append(UIColor.black)
    }
    else if (value == 1.0)
    {
        myColors.append(MyVariables.colorOne)
    }
    else if (value == 2.0)
    {
        myColors.append(MyVariables.colorTwo)
    }
    else if (value == 3.0)
    {
        myColors.append(MyVariables.colorThree)
    }
    else if (value == 4.0)
    {
        myColors.append(MyVariables.colorFour)
    }
    else if (value == 5.0)
    {
        myColors.append(MyVariables.colorFive)
    }
}

func backButtonTapped()
{
    self.navigationController?.popViewController(animated: false)
}
func switchChartButtonTapped()
{
    let alertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.actionSheet)
    let goToLineChartAction = UIAlertAction(title: "Line Chart", style: UIAlertActionStyle.default)
    { (alertAction: UIAlertAction!) -> Void in
        self.navigationController?.popViewController(animated: false)
       let viewControllerStoryboardId = "LineChartDisplayViewController"
        let storyboardName = "Main"
        let storyboard = UIStoryboard(name: storyboardName, bundle: Bundle.main)
        let viewController = storyboard.instantiateViewController(withIdentifier: viewControllerStoryboardId)
        self.navigationController?.pushViewController(viewController, animated: false)
    }
    alertController.addAction(goToLineChartAction)
    alertController.view.tintColor = UIColor.black
    present(alertController, animated: true, completion:  nil)
    let presentationController = alertController.popoverPresentationController
    presentationController?.sourceView = self.view
    presentationController?.sourceRect = CGRect(x: 330, y: 210, width: 330, height: 210)
}
func finalizeResultsButtonTapped()
{

}

override func setDelegate()
{
    chartView.delegate = self
}
override func setValueFormatter(set: BarChartDataSet)
{
    set.valueFormatter = DerivedClassNumberFormatter()
}
}

class DerivedClassNumberFormatter: NSObject, IValueFormatter {
func stringForValue(_ value: Double, entry: ChartDataEntry, dataSetIndex: Int, viewPortHandler: ViewPortHandler?) -> String {
    var returnVal = "(Int(value))"

    return returnVal
}
}

我有几个问题。你是否将UIView设为ChartViewDelegate，还是应该是包含保存图表对象的UIView的视图控制器？我错过了什么明显的东西？我之前使用过自定义UIViews，所以我知道该代码是正确的（除了类是否应该是ChartViewDelegate，这是 - 我不知道）。是的，我确实需要所有这些课程，因为将来会有很多很多图表类型。无论如何，关于我可以做什么来获得图表的任何建议都会很棒。

谢谢，肖恩