设置Label的行间距

- (void)labelSpacing:(NSString *)textString
{
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:textString];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:10];//调整行间距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [textString length])];
self.contentLabel.attributedText = attributedString;
[self.contentLabel sizeToFit];
}