Implemented parsing TAN challenge's HTML

ui/BankingiOSApp/BankingiOSApp/ui/SwiftExtensions.swift

@@ -41,6 +41,25 @@ extension String {
     }
     
     
+    ///
+    /// Be aware that this crashes when used in a View's body method. So use it only e.g. in init() method
+    ///
+    /// This an htmlToString has been copied from https://stackoverflow.com/a/47230632
+    ///
+    var htmlToAttributedString: NSAttributedString? {
+        guard let data = data(using: .utf8) else { return nil }
+        do {
+            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
+        } catch {
+            return nil
+        }
+    }
+    
+    var htmlToString: String {
+        return htmlToAttributedString?.string ?? ""
+    }
+    
+    
     var isCoreDataId: Bool {
         return self.starts(with: "x-coredata://")
     }

ui/BankingiOSApp/BankingiOSApp/ui/views/EnterTanDialog.swift

@@ -35,6 +35,8 @@ struct EnterTanDialog: View {
     
     private let imageTanChallenge: ImageTanChallenge?
     
+    private let messageToShowToUser: String
+    
     @State private var enteredTan = ""
 
     
@@ -57,6 +59,8 @@ struct EnterTanDialog: View {
         self.flickerCodeTanChallenge = tanChallenge as? FlickerCodeTanChallenge
         self.imageTanChallenge = tanChallenge as? ImageTanChallenge
         
+        self.messageToShowToUser = tanChallenge.messageToShowToUser.htmlToString // parse in init() calling this method in body { } crashes application
+        
         if let decodingError = (tanChallenge as? FlickerCodeTanChallenge)?.flickerCode.decodingError {
             showDecodingTanChallengeFailedErrorDelayed(decodingError)
         }
@@ -97,7 +101,7 @@ struct EnterTanDialog: View {
                 }
                 
                 HStack {
-                    CollapsibleText(tanChallenge.messageToShowToUser)
+                    CollapsibleText(messageToShowToUser)
                     Spacer()
                 }
                 .padding(.top, 6)