UILabel设置行间距并且计算文本高度所占内容

有时候我们在有些文本设计中需要对行间距有一些特殊的要求，那么uilabel是不能直接设置行间距的，那么我们应该如何来设置行间距呢?

设置行间距

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.stringData];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:10];//调整行间距
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.stringData length])];
    contentLabel.attributedText = attributedString;

计算带有行间距的文本的高度

- (CGSize)getSizeWithLabelString:(NSString *)text
                             font:(UIFont *)font
                             width:(NSInteger)width
                             lineSpace:(NSInteger)lineSpace {
    NSMutableAttributedString *attributedString =
    [[NSMutableAttributedString alloc] initWithString:text];
    NSMutableParagraphStyle *paragraphStyle =
    [[NSMutableParagraphStyle alloc] init];
    
    [paragraphStyle setLineSpacing:lineSpace];
    [attributedString addAttribute:NSParagraphStyleAttributeName
                             value:paragraphStyle
                             range:NSMakeRange(0, text.length)];
    
    CGSize stringSize =
    [text boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
                       options:NSStringDrawingUsesLineFragmentOrigin |
     NSStringDrawingUsesFontLeading |
     NSStringDrawingTruncatesLastVisibleLine
                    attributes:@{
                                 NSFontAttributeName : font,
                                 NSParagraphStyleAttributeName : paragraphStyle
                                 } context:nil].size;
    
    return stringSize;
}