UILabelで行間を調節したい。ただし、折り返しの場合は行間はデフォルトで。 ref: http://qiita.com/y_koh/items/4f6c6eb3d8c8cd691c81

file0.txt

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];
NSArray *texts = [text componentsSeparatedByString:@"\n"];
int i = 0;
for (NSString *text in texts) {
    if (i > 0) {
        // 行間用の改行を追加
        NSMutableAttributedString *lf = [[NSMutableAttributedString alloc] initWithString:@"\n\n"];
        UIFont *font = [UIFont systemFontOfSize:4.0f];
        [lf addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, lf.length)];
        [attributedString appendAttributedString:lf];
    }

    NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:text];
    UIFont *font = [UIFont systemFontOfSize:12.0f];
    [attributedText addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, attributedText.length)];
    [attributedString appendAttributedString:attributedText];

    i++;
}