Not work after upgrade to IOS 17 and Xcode 15 #899 (#905)

Co-authored-by: Salma <salmaahhmed2@yahoo.com>

Author: salmaahhmed

ios/Classes/FlutterDownloaderPlugin.m

@@ -299,7 +299,9 @@ - (void)sendUpdateProgressForTaskId: (NSString*)taskId inStatus: (NSNumber*) sta
 {
  NSArray *args = @[@(_callbackHandle), taskId, status, progress];
  if (initialized && _callbackHandle != 0) {
- [_callbackChannel invokeMethod:@"" arguments:args];
+ dispatch_async(dispatch_get_main_queue(), ^{
+ [self-> _callbackChannel invokeMethod:@"" arguments:args];
+ });
  } else {
  [_eventQueue addObject:args];
  }
@@ -361,11 +363,7 @@ - (NSURL*)fileUrlOf:(NSString*)taskId taskInfo:(NSDictionary*)taskInfo downloadT
  if (filename == nil || ![filename isKindOfClass:[NSString class]] || [filename isEqualToString:@""]) {
  // If suggestedFilename is empty, use the last path component of the URL as the filename
  filename = [self sanitizeFilename:suggestedFilename];
- } else {
- // Sanitize the suggestedFilename to remove unsafe characters
- filename = [self sanitizeFilename:filename];
- }
-
+ } 
  // Update the taskInfo with the sanitized filename
  NSMutableDictionary *mutableTaskInfo = [taskInfo mutableCopy];
  mutableTaskInfo[KEY_FILE_NAME] = filename;
@@ -390,7 +388,25 @@ - (NSString*)absoluteSavedDirPathWithShortSavedDir:(NSString*)shortSavedDir sear
 
 - (NSString *)sanitizeFilename:(nullable NSString *)filename {
  // Define a list of allowed characters for filenames
- NSCharacterSet *allowedCharacters = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_."];
+ NSMutableCharacterSet *allowedCharacters = [[NSMutableCharacterSet alloc] init];
+
+ // Allow alphabetical characters (lowercase and uppercase)
+ [allowedCharacters formUnionWithCharacterSet:[NSCharacterSet letterCharacterSet]];
+
+ // Allow digits
+ [allowedCharacters addCharactersInRange:NSMakeRange('0', 10)]; // ASCII digits
+
+ // Allow additional characters: -_.()
+ [allowedCharacters addCharactersInString:@"-_.()"];
+
+ // Allow empty spaces
+ [allowedCharacters addCharactersInString:@" "];
+
+ // Remove the backslash (if you want to disallow it)
+ [allowedCharacters removeCharactersInString:@"\\"];
+
+ // Now, you have a character set that allows the specified characters
+ NSCharacterSet *finalCharacterSet = [allowedCharacters copy];
  if (filename == nil || [filename isEqual:[NSNull null]] || [filename isEqualToString:@""]) {
  NSString *defaultFilename = @"default_filename";
  return defaultFilename;