button 按钮 字符间距

NSString *buttonTitle = title;
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:buttonTitle];

// 设置字符间距（这里使用10作为例子）
[attributedString addAttribute:NSKernAttributeName value:@(2) range:NSMakeRange(0, [buttonTitle length])];

UIFont *boldFont = WLFontBold(14); // 设置所需的粗体大小
[attributedString addAttribute:NSFontAttributeName value:boldFont range:NSMakeRange(0, [buttonTitle length])];

// 将修改后的标题应用到按钮上
[_updataCardBtn setAttributedTitle:attributedString forState:UIControlStateNormal];