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获取数据问题 #4

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yangxuy opened this issue Aug 1, 2019 · 1 comment
Open

获取数据问题 #4

yangxuy opened this issue Aug 1, 2019 · 1 comment

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@yangxuy
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yangxuy commented Aug 1, 2019

我打开你的案例demo直接报错The getter 'length' was called on null. 点进去是这个地方
Scrollbar(
child: SingleChildScrollView(
child: Container(
width: bloc.rectWidth * data.length,(这里的length为null)
),
controller: _controller,
scrollDirection: Axis.horizontal,
))
@yangxuy
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yangxuy commented Aug 1, 2019

Scrollbar(
child: SingleChildScrollView(
child: Container(
width: bloc.rectWidth * (data?.length ?? 0),(这里做一下这样的处理，就没有报错了)
),
controller: _controller,
scrollDirection: Axis.horizontal,
))

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@yangxuy