Flutter：滑动窗口小部件itemCount从无限（？）起变化

Question

我正在使用Swiper小部件构建助手列表。问题是，例如，从助手列表中来的只有1个用户或2个用户，而刷卡器无限次地向这些用户致敬，我想知道如何将其限制为助手的数量。谢谢！这是我的代码：

    child: Swiper(
      autoplay: true,
      autoplayDelay: 2000,
      itemBuilder: (BuildContext context, int index) {
        return Column(
          mainAxisSize: MainAxisSize.min,
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: <Widget>[
            CircleAvatar(
              backgroundImage: NetworkImage(
                  "host${_user.img}"),
              radius: 35.0,
            ),
            Text(
              assistants[index].username,
              style: TextStyle(fontSize: 12.0),
            ),
          ],
        );
      },
      scale: .01,
      itemCount: assistants.length,
      viewportFraction: .18,
    ),

Answer 1

实际上，它已经只构建了2个项目（或者最好根据助手列表的长度来说明它的构建项目）。因此，如果您希望它结束​​于某个地方，则可以轻松地将loop属性设置为false。尝试下面的代码：

  child: Swiper(
  autoplay: true,
  loop: false,  //this is the property that prevents the swiper from looping
  autoplayDelay: 2000,
  itemBuilder: (BuildContext context, int index) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
        CircleAvatar(
          backgroundImage: NetworkImage(
              "host${_user.img}"),
          radius: 35.0,
        ),
        Text(
          assistants[index].username,
          style: TextStyle(fontSize: 12.0),
        ),
      ],
    );
  },
  scale: .01,
  itemCount: assistants.length,
  viewportFraction: .18,
),