label的段间距-ios

NSString *dLabelString = @"1. XXXXXXX \n2. XXXXXXXX\n3. XXXXXXXX";
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:dLabelString];
    NSMutableParagraphStyle   *paragraphStyle   = [[NSMutableParagraphStyle alloc] init];
    //行间距
    [paragraphStyle setLineSpacing:5.0];
    //段落间距
    [paragraphStyle setParagraphSpacing:7];
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [dLabelString length])];
   label.attributedText = attributedString;