SwiftUI-如何在Swift中使用结果

Question

如果我使用此代码，请正常工作。

<div id="sectionOne" class="container-fluid d-flex flex-column justify-content-center align-items-center" style="height: 80vh;">
  <div class="row d-flex justify-content-center" style="color: #0069d9">
    <h1 >Section One</h1>
  </div>
  <div class="row section-one-row d-flex justify-content-around">
    <div class="col-lg-4 text-center">
        <div style="padding: 40px">
        <div class="card-item" style="padding: 40px;">
            <h3>Card A</h3>
            <h5>
                Some text here. Some text here. Some text here
            </h5>
        </div>
      </div>
    </div>
    <div class="col-lg-4 text-center">
        <div style="padding: 40px">
        <div class="card-item" style="padding: 40px;">
            <h3>Card B</h3>
            <h5>
                Some text here. Some text here. Some text here
            </h5>
        </div>
      </div>
    </div>
    <div class="col-lg-4 text-center">
        <div style="padding: 40px">
        <div class="card-item" style="padding: 40px;">
            <h3>Card C</h3>
            <h5>
              Some text here. Some text here. Some text here
            </h5>
        </div>
      </div>
    </div>
  </div> 
  <div class="row section-one-row d-flex justify-content-around">
    <div class="col-12 d-flex justify-content-center">
      <button id="caption-button" class="btn btn-primary">Get Started!</button>
    </div>
  </div>
</div>

如果我在SwiftUI中使用相同的代码，请不要使用（请参见截屏屏幕）

如何消除错误？

Answer 1

index => "my-index-%{+YYYY-MM-dd}" 必须返回一个视图，因此只需添加body或您想在return EmptyView()之后显示的任何视图

fetchUnreadCount

无论如何，您不应该执行诸如在View中获取数据之类的事情，这项工作应该在模型中完成