Get a nicely formatted filename for an ALAsset

ALAssetName

- (NSDateFormatter *)syncDateFormatter
{
    static NSDateFormatter *_syncDateFormatter;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _syncDateFormatter = [NSDateFormatter new];
        _syncDateFormatter.dateFormat = @"yyyy-MM-dd HH.mm.ss";
        _syncDateFormatter.locale = [NSLocale currentLocale];
    });
    return _syncDateFormatter;
}

- (NSString *)filenameForAsset:(ALAsset *)asset
{
    NSDate *itemDate = [asset valueForProperty:ALAssetPropertyDate];
    NSURL *itemURL = [[asset defaultRepresentation] url];
    NSString *itemExtension = [itemURL dictionaryFromQueryString][@"ext"];

    return [NSString stringWithFormat:@"%@.%@", [[self syncDateFormatter] stringFromDate:itemDate], itemExtension.lowercaseString];
}