Label字间距行间距

UILabel *label2 = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 100, 500)];
    [self.view addSubview:label2];
    
    NSString *labelText = @"哈哈\nqwer\n!!!aaaaaaaaaaaaaaaaaaaaaa";
    label2.numberOfLines = 0; // 最关键的一句
    NSMutableDictionary *attDic = [NSMutableDictionary dictionary];
    // 字体大小
    [attDic setValue:[UIFont systemFontOfSize:15] forKey:NSFontAttributeName];
    // 字体颜色
    [attDic setValue:[UIColor redColor] forKey:NSForegroundColorAttributeName];
    // 字间距
    [attDic setValue:@5 forKey:NSKernAttributeName];
    // 设置字体背景色
    [attDic setValue:[UIColor cyanColor] forKey:NSBackgroundColorAttributeName];
    
    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:labelText attributes:attDic];
    
    // 设置行间距
    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
    style.lineSpacing = 10;
    [attStr addAttribute:NSParagraphStyleAttributeName value:style range: NSMakeRange(0, labelText.length)];
    
    label2.attributedText = attStr;