NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.infoLabel.text attributes:@{NSKernAttributeName : @(1.5f)}];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:6];
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, self.infoLabel.text.length)];
[self.infoLabel setAttributedText:attributedString];
self.infoLabel.numberOfLines = 0;
[self.infoLabel sizeToFit];
[self.scrollView addSubview:self.infoLabel];
设置Label行间距和字间距
