joinGroup method
Apply to join a group, requiring approval from an administrator or the group.
joinSource
2: Invited, 3: Searched, 4: Using a QR code
Implementation
Future<dynamic> joinGroup({required String groupID, String? reason, String? operationID, int joinSource = 3, String? ex}) => _channel.invokeMethod(
'joinGroup',
_buildParam({
'groupID': groupID,
'reason': reason,
'joinSource': joinSource,
'ex': ex,
'operationID': Utils.checkOperationID(operationID),
}));