YYLabel 设置行间距 和 字间距

 // 设置字间距
    CGFloat spacing = 4.0;
    [attributedString yy_setKern:@(spacing) range:NSMakeRange(0, attributedString.length)];
    

    CGFloat spacing = 4.0;
    [hintString yy_setKern:@(spacing) range:NSMakeRange(0, hintString.length)];
    
    
    // 创建NSMutableParagraphStyle并设置行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = 4.0; // 设置行间距为10
    
    // 将段落样式应用到整个字符串
    [hintString yy_setParagraphStyle:paragraphStyle range:NSMakeRange(0, hintString.length)];

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建一个YYLabel
    YYLabel *yyLabel = [[YYLabel alloc] initWithFrame:CGRectMake(20, 50, 300, 50)];
    
    // 创建一个NSMutableAttributedString
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"这是一段测试文本"];
    
    // 设置整体字体
    attributedString.yy_font = [UIFont systemFontOfSize:18.0];
    
    // 设置指定范围内的字体大小
    UIFont *largeFont = [UIFont systemFontOfSize:24.0];
    [attributedString yy_setFont:largeFont range:NSMakeRange(0, 5)];
    
    // 设置字间距
    CGFloat spacing = 4.0;
    [attributedString yy_setKern:@(spacing) range:NSMakeRange(0, attributedString.length)];
    
  // 创建NSMutableParagraphStyle并设置行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = 10.0; // 设置行间距为10
    
    // 将段落样式应用到整个字符串
    [attributedString yy_setParagraphStyle:paragraphStyle range:NSMakeRange(0, attributedString.length)];
    

    // 设置YYLabel的属性文本
    yyLabel.attributedText = attributedString;
    
    // 将YYLabel添加到视图中
    [self.view addSubview:yyLabel];
}