iOS富文本设置尾部间距

- (void)setAttributeStringForValueLabel:(UILabel *)label text:(NSString *)text
{
    NSMutableAttributedString *attrString = [[NSMutableAttributedString
                                              alloc] initWithString:text];
    NSUInteger length = [text length];
    NSMutableParagraphStyle *
    style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
    style.tailIndent = -PASFactor(5); //设置与尾部的距离
    style.alignment = NSTextAlignmentRight;//靠右显示
    [attrString addAttribute:NSParagraphStyleAttributeName value:style
                       range:NSMakeRange(0, length)];
    label.attributedText = attrString;
}