(NSString )dataFilePath{
NSArray paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:@”config.plist”];
}

+(NSMutableDictionary )loadFromFile {
NSString error = nil;
NSPropertyListFormat format;
NSMutableDictionary dict = nil;
NSString filePath = [self dataFilePath];
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
filePath = [[NSBundle mainBundle] pathForResource:@”config” ofType:@”plist”];
}
NSData plistXML = [[NSFileManager defaultManager] contentsAtPath:filePath];
dict = (NSMutableDictionary )[NSPropertyListSerialization propertyListFromData:plistXML
mutabilityOption:NSPropertyListMutableContainersAndLeaves
format:&format
errorDescription:&error];
return dict;
}

+(BOOL)saveToFile:(NSMutableDictionary )withData {
NSString error = nil;
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:withData format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
if(plistData) {
return [plistData writeToFile:[self dataFilePath] atomically:YES];
} else {
return FALSE;
}
}