Merge pull request #2 from adri567/preference_key_on_pricelabel

Instead of makeView to get the size of the price label, we are now us…

Sources/CheesyChart/Extensions/View+Extensions.swift

@@ -0,0 +1,19 @@
+//
+//  View+Extensions.swift
+//  
+//
+//  Created by Adrian Suthold on 18.05.22.
+//
+
+import Foundation
+import SwiftUI
+
+extension View {
+
+    /// Get the actual width of the price label
+    /// - Parameter width: Width of the price label
+    /// - Returns: Since we are using this method as a modifier we need to return some View, to use it on a rectangle
+    func getTextWidth(_ width: CGFloat) -> some View {
+        preference(key: PriceLabelPreferenceKey.self, value: width)
+    }
+}

Sources/CheesyChart/HelperViews/ChartPriceLabelView.swift

@@ -1,6 +1,6 @@
 //
 //  ChartPriceLabelView.swift
-//  
+//
 //
 //  Created by Adrian Suthold on 21.04.22.
 //
@@ -25,9 +25,15 @@ public struct ChartPriceLabelView: View {
             .foregroundColor(setup.chartPriceLabelFontColor)
             .background(
                 GeometryReader { textGeometry in
-                    makeView(geometry: textGeometry)
+                    Rectangle()
+                        .fill(.clear)
+                        .frame(maxWidth: .infinity)
+                        .getTextWidth(textGeometry.size.width)
                 }
             )
+            .onPreferenceChange(PriceLabelPreferenceKey.self, perform: { value in
+                textWidth = value
+            })
             .background(setup.chartPriceLabelColor)
             .cornerRadius(setup.chartPriceLabelCornerRadius)
             .position(
@@ -53,16 +59,6 @@ public struct ChartPriceLabelView: View {
     private func checkInput() -> String {
         return vm.point > setup.data.count ? "" : setup.data[vm.point].asCurrencyWithTwoDecimals()
     }
-
-    /// Gives use the geometry of a text. In this case we are asign the geometry.size.width to our textWidth variable to get the width for further using in the calculateBorder() method.
-    /// - Parameter geometry: Geometry of the Text
-    /// - Returns: Rectangle View that is in the background of our Text
-    private func makeView(geometry: GeometryProxy) -> some View {
-        DispatchQueue.main.async {
-            self.textWidth = geometry.size.width
-        }
-        return Rectangle().fill(.clear)
-    }
 }
 
 //struct PriceLabelView_Previews: PreviewProvider {

Sources/CheesyChart/Utilities/PriceLabelPreferenceKey.swift

@@ -0,0 +1,19 @@
+//
+//  PriceLabelPreferenceKey.swift
+//  
+//
+//  Created by Adrian Suthold on 18.05.22.
+//
+
+import Foundation
+import SwiftUI
+
+struct PriceLabelPreferenceKey: PreferenceKey {
+
+    static var defaultValue: CGFloat = 0.0
+
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
+        value = nextValue()
+    }
+
+}