Fix: text color of the last event description was incorrect.

Riot/Utils/ThemeColorResolver.swift

@@ -0,0 +1,48 @@
+// 
+// Copyright 2023 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+/// Utility struct to get a theme color by its name
+struct ThemeColorResolver {
+    private static var theme: Theme?
+    private static var colorsTable: [String: UIColor] = [:]
+    private static let queue = DispatchQueue(label: "io.element.ThemeColorResolver.queue", qos: .userInteractive)
+
+    private static func setTheme(theme: Theme) {
+        queue.sync {
+            guard self.theme?.identifier != theme.identifier else {
+                return
+            }
+            self.theme = theme
+            colorsTable = [:]
+            let mirror = Mirror(reflecting: theme.colors)
+            for child in mirror.children {
+                if let colorName = child.label {
+                    colorsTable[colorName] = child.value as? UIColor
+                }
+            }
+        }
+    }
+    
+    /// Finds a color by its name in the current theme colors
+    /// - Parameter name: color name
+    /// - Returns: the corresponding color or nil
+    static func getColorByName(_ name: String) -> UIColor? {
+        setTheme(theme: ThemeService.shared().theme)
+        return colorsTable[name]
+    }
+}