label设置行间距

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:label.text];

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

[paragraphStyle setLineSpacing:5];//调整行间距

[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [label.text length])];

label.attributedText = attributedString;

 [label sizeToFit];