设置Label行间距和字间距

 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