如何使用可折叠的搜索栏实现SliverAppBar [英] How to implement a SliverAppBar with a collapsable search bar

问题描述

这是我要尝试的操作，它是iOS上非常常见的小部件.这是我的代码:

This is what I'm trying to do, it's a pretty common Widget on iOS. This is my code:

return Scaffold(
  backgroundColor: Colors.white,
  body: CustomScrollView(
    slivers: <Widget>[
      SliverAppBar(
        automaticallyImplyLeading: false,
        pinned: true,
        titleSpacing: 0,
        backgroundColor: Colors.white,
        elevation: 1.0,
        title: Container(
          width: double.infinity,
          child: Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            mainAxisSize: MainAxisSize.max,
            children: <Widget>[
              CupertinoButton(
                padding: EdgeInsets.all(0),
                onPressed: () {},
                child: AutoSizeText(
                  'Ordenar',
                  style: TextStyle(
                    color: Color(0xff16161F),
                    fontFamily: 'Brutal',
                    fontSize: 17.0,
                  ),
                ),
              ),
              AutoSizeText(
                'Equipos 14',
                style: TextStyle(
                  color: Color(0xff16161F),
                  fontFamily: 'Archia',
                  fontSize: 22.0,
                ),
              ),
              CupertinoButton(
                padding: EdgeInsets.all(0),
                onPressed: () {},
                child: AutoSizeText(
                  'Editar',
                  style: TextStyle(
                    color: Color(0xff16161F),
                    fontFamily: 'Brutal',
                    fontSize: 17.0,
                  ),
                ),
              ),
            ],
          ),
        ),
        centerTitle: true,
      ),
      SliverFillRemaining(
        child: Center(
          child: CupertinoButton(
            onPressed: () {
              setState(() {
                (isBottom) ? isBottom = false : isBottom = true;
              });
            },
            child: Text('YESSS'),
          ),
        ),
      ),
    ],
  ),
  bottomNavigationBar: (isBottom) ? _toolBar() : _tabBar(),
);

我尝试将CupertinoTextField()添加到bottom属性，但是它进入了我的Row()并弄乱了所有内容.有没有人做到这一点，或者知道如何实现?

I've tried adding a CupertinoTextField() to the bottom property, but it gets into my Row() and messes up everything. Has anyone done this, or knows how to achieve it?

谢谢.

推荐答案

我设法解决了这个问题. SliverAppBar具有一个名为flexibleSpace的属性.在这里放置一个FlexibleSpaceBar，其中包含一个background属性.现在，不要上当，这不仅限于纯色或图像.它可以带任何您想要的小部件.就我而言，我想添加一个搜索栏.并且因为此属性将填充整个expandedHeight属性，所以您要添加一个小的空白，以使自定义窗口小部件不会在SliverAppBar上绘制.这是相关的代码段:

I managed to solve it. SliverAppBar has a property called flexibleSpace. In here you put a FlexibleSpaceBar, which contains a background property. Now, don't be fooled, this is not limited to a solid color or an image. It can take any Widget you want. In my case, I wanted to add a search bar. And because this property will fill the entire expandedHeight property, you want to add a small blank space so your custom widgets don't get drawn over your SliverAppBar. Here's the relevant piece of code:

flexibleSpace: FlexibleSpaceBar(
          background: Column(
            children: <Widget>[
              SizedBox(height: 90.0),
              Padding(
                padding: const EdgeInsets.fromLTRB(16.0, 6.0, 16.0, 16.0),
                child: Container(
                  height: 36.0,
                  width: double.infinity,
                  child: CupertinoTextField(
                    keyboardType: TextInputType.text,
                    placeholder: 'Filtrar por nombre o nombre corto',
                    placeholderStyle: TextStyle(
                      color: Color(0xffC4C6CC),
                      fontSize: 14.0,
                      fontFamily: 'Brutal',
                    ),
                    prefix: Padding(
                      padding:
                          const EdgeInsets.fromLTRB(9.0, 6.0, 9.0, 6.0),
                      child: Icon(
                        Icons.search,
                        color: Color(0xffC4C6CC),
                      ),
                    ),
                    decoration: BoxDecoration(
                      borderRadius: BorderRadius.circular(8.0),
                      color: Color(0xffF0F1F5),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),

这是结果.滚动向上滚动时，搜索栏将消失.希望这对想要这样做的人有所帮助.

And here is the result. The search bar will disappear when the scroll goes up. Hope this helps anyone wanting to do this.

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