// 调整行间距
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.content.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:7];
paragraphStyle.firstLineHeadIndent=32;
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.content.text length])];
self.content.attributedText = attributedString;
[self.content sizeToFit];
self.content.numberOfLines=0;