Merge pull request #230 from willdale/226-publishing-changes-from-within-view-updates-is-not-allowed-this-will-cause-undefined-behavior

226: Fix warning about updates from within a view

Author: willdale

Sources/SwiftUICharts/BarChart/Models/ChartData/BarChartData.swift

@@ -25,7 +25,7 @@ public final class BarChartData: CTBarChartDataProtocol, GetDataProtocol, Publis
     @Published public final var viewData: ChartViewData
     @Published public final var infoView: InfoViewData<BarChartDataPoint> = InfoViewData()
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/BarChart/Models/ChartData/GroupedBarChartData.swift

@@ -30,7 +30,7 @@ public final class GroupedBarChartData: CTMultiBarChartDataProtocol, GetDataProt
     @Published public final var infoView: InfoViewData<GroupedBarDataPoint> = InfoViewData()
     @Published public final var groups: [GroupingData]
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/BarChart/Models/ChartData/HorizontalBarChartData.swift

@@ -25,7 +25,7 @@ public final class HorizontalBarChartData: CTHorizontalBarChartDataProtocol, Get
     @Published public final var viewData: ChartViewData
     @Published public final var infoView: InfoViewData<BarChartDataPoint> = InfoViewData()
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/BarChart/Models/ChartData/RangedBarChartData.swift

@@ -25,7 +25,7 @@ public final class RangedBarChartData: CTRangedBarChartDataProtocol, GetDataProt
     @Published public final var viewData: ChartViewData
     @Published public final var infoView: InfoViewData<RangedBarDataPoint> = InfoViewData()
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/BarChart/Models/ChartData/StackedBarChartData.swift

@@ -29,7 +29,7 @@ public final class StackedBarChartData: CTMultiBarChartDataProtocol, GetDataProt
     @Published public final var infoView: InfoViewData<StackedBarDataPoint> = InfoViewData()
     @Published public final var groups: [GroupingData]
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/LineChart/Models/ChartData/LineChartData.swift

@@ -30,7 +30,7 @@ public final class LineChartData: CTLineChartDataProtocol, GetDataProtocol, Publ
     public final var noDataText: Text
     public final var chartType: (chartType: ChartType, dataSetType: DataSetType)
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/LineChart/Models/ChartData/MultiLineChartData.swift

@@ -30,7 +30,7 @@ public final class MultiLineChartData: CTLineChartDataProtocol, GetDataProtocol,
     public final var noDataText: Text
     public final var chartType: (chartType: ChartType, dataSetType: DataSetType)
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/LineChart/Models/ChartData/RangedLineChartData.swift

@@ -30,7 +30,7 @@ public final class RangedLineChartData: CTLineChartDataProtocol, GetDataProtocol
     public final var noDataText: Text
     public final var chartType: (chartType: ChartType, dataSetType: DataSetType)
 
-    @Published public final var extraLineData: ExtraLineData!
+    @Published public final var extraLineData: ExtraLineData?
 
     // Publishable
     public var subscription = SubscriptionSet().subscription

Sources/SwiftUICharts/PieChart/Views/DoughnutChart.swift

@@ -82,7 +82,7 @@ public struct DoughnutChart<ChartData>: View where ChartData: DoughnutChartData
         if chartData.disableAnimation {
             return 1
         } else {
-            return startAnimation ? 1 : 0
+            return startAnimation ? 1 : 0.001
         }
     }
 }

Sources/SwiftUICharts/Shared/Types/Stroke.swift

@@ -37,7 +37,9 @@ public struct Stroke: Hashable, Identifiable {
         self.miterLimit = miterLimit
         self.dash = dash
         self.dashPhase = dashPhase
-    }    
+    }
+    
+    static let `default` = Stroke()
 }
 
 extension Stroke {

Sources/SwiftUICharts/Shared/ViewModifiers/TouchOverlay.swift

@@ -15,6 +15,9 @@ internal struct TouchOverlay<T>: ViewModifier where T: CTChartData {
 
     @ObservedObject private var chartData: T
     let minDistance: CGFloat
+    private let specifier: String
+    private let formatter: NumberFormatter?
+    private let unit: TouchUnit
 
     internal init(
         chartData: T,
@@ -25,9 +28,9 @@ internal struct TouchOverlay<T>: ViewModifier where T: CTChartData {
     ) {
         self.chartData = chartData
         self.minDistance = minDistance
-        self.chartData.infoView.touchSpecifier = specifier
-        self.chartData.infoView.touchFormatter = formatter
-        self.chartData.infoView.touchUnit = unit
+        self.specifier = specifier
+        self.formatter = formatter
+        self.unit = unit
     }
 
     internal func body(content: Content) -> some View {
@@ -55,6 +58,11 @@ internal struct TouchOverlay<T>: ViewModifier where T: CTChartData {
                 }
             } else { content }
         }
+        .onAppear {
+            self.chartData.infoView.touchSpecifier = specifier
+            self.chartData.infoView.touchFormatter = formatter
+            self.chartData.infoView.touchUnit = unit
+        }
     }
 }
 #endif

Sources/SwiftUICharts/SharedLineAndBar/Models/Protocols/LineAndBarProtocols.swift

@@ -38,7 +38,7 @@ public protocol CTLineBarChartDataProtocol: CTChartData where CTStyle: CTLineBar
     /**
      A data model for the `ExtraLine` View Modifier
     */
-    var extraLineData: ExtraLineData! { get set }
+    var extraLineData: ExtraLineData? { get set }
 
     /**
      A type representing a View for displaying second set of labels on the Y axis.

Sources/SwiftUICharts/SharedLineAndBar/Models/Protocols/LineAndBarProtocolsExtentions.swift

@@ -311,12 +311,12 @@ extension CTLineBarChartDataProtocol {
 
     internal var extraLabelsArray: [String] { self.generateExtraYLabels(self.viewData.yAxisSpecifier) }
     private func generateExtraYLabels(_ specifier: String) -> [String] {
-        
-        let dataRange: Double = self.extraLineData.range
-        let minValue: Double = self.extraLineData.minValue
-        let range: Double = dataRange / Double(self.extraLineData.style.yAxisNumberOfLabels-1)
+        guard let extraLineData = extraLineData else { return [] }
+        let dataRange: Double = extraLineData.range
+        let minValue: Double = extraLineData.minValue
+        let range: Double = dataRange / Double(extraLineData.style.yAxisNumberOfLabels-1)
         let firstLabel = [String(format: specifier, minValue)]
-        let otherLabels = (1...self.extraLineData.style.yAxisNumberOfLabels-1).map { String(format: specifier, minValue + range * Double($0)) }
+        let otherLabels = (1...extraLineData.style.yAxisNumberOfLabels-1).map { String(format: specifier, minValue + range * Double($0)) }
         let labels = firstLabel + otherLabels
         return labels
 
@@ -363,7 +363,7 @@ extension CTLineBarChartDataProtocol {
 
     public func getExtraYAxisTitle(colour: AxisColour) -> some View {
         Group {
-            if let title = self.extraLineData.style.yAxisTitle {
+            if let title = self.extraLineData?.style.yAxisTitle {
                 VStack {
                     if self.chartStyle.xAxisLabelPosition == .top {
                         Spacer()
@@ -391,7 +391,7 @@ extension CTLineBarChartDataProtocol {
                             case .none:
                                 EmptyView()
                             case .style(let size):
-                                self.getAxisColourAsCircle(customColour: self.extraLineData.style.lineColour, width: size)
+                                self.getAxisColourAsCircle(customColour: self.extraLineData?.style.lineColour ?? ColourStyle(), width: size)
                             case .custom(let colour, let size):
                                 self.getAxisColourAsCircle(customColour: colour, width: size)
                             }