Use iTunes file sharing in your app and copy the ringtone file to the app's documents directory.
Set "Application supports iTunes file sharing" to YES in your info.plist
Wherever appropriate in your app copy out the file with the code below:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"MyRingtone" ofType:@"m4r"];
NSData *mainBundleFile = [NSData dataWithContentsOfFile:filePath];
[[NSFileManager defaultManager] createFileAtPath:[documentsDirectory stringByAppendingPathComponent:@"MyRingtone.m4r"]
contents:mainBundleFile
attributes:nil];
The user can now access the ringtone via itunes and add it to their device's ringtones.
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