label设置列间距和首行缩进

NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc] initWithString:self.contentLabel.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStylealloc] init];
paragraphStyle.alignment = NSTextAlignmentLeft;
paragraphStyle.maximumLineHeight = 60; //最大的行高
paragraphStyle.lineSpacing = 5; //行自定义行高度
[paragraphStyle setFirstLineHeadIndent:self.usernameLabel.frame.size.width + 5];//首行缩进 根据用户昵称宽度在加5个像素
[attributedString addAttribute:NSParagraphStyleAttributeNamevalue:paragraphStyle range:NSMakeRange(0, [self.contentLabel.textlength])];
self.contentLabel.attributedText = attributedString;
[self.contentLabelsizeToFit];
／／self.contentLabel.adjustsLetterSpacingToFitWidth = YES;