Is it possible to write new file to bundle resource directory in iOS app?
No there is no way to write in the bundle dir.. because the bundle dir is code signed with SSL certificate and you can't break it. however you can easily write in the documents directory of you iphone application
You can get the documents directory path using this -
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
return [paths objectAtIndex:0];