Question

我在Table中有以下Card。由于添加了padding小部件，因此出现以下错误：

    I/flutter (19671): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (19671): The following assertion was thrown during performLayout():
I/flutter (19671): 'package:flutter/src/rendering/table.dart': Failed assertion: line 882 pos 16: 'tableWidth >=
I/flutter (19671): targetWidth': is not true.
I/flutter (19671): 
I/flutter (19671): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (19671): more information in this error message to help you determine and fix the underlying cause.
I/flutter (19671): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (19671):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter (19671): 
I/flutter (19671): When the exception was thrown, this was the stack:
I/flutter (19671): #2      RenderTable._computeColumnWidths (package:flutter/src/rendering/table.dart:882:16)
I/flutter (19671): #3      RenderTable.performLayout (package:flutter/src/rendering/table.dart:1000:33)

代码：

body: Container(
          padding: EdgeInsets.all(5.0), margin: EdgeInsets.all(10.0),
            child: Card(
                child: Column(
                    mainAxisSize: MainAxisSize.min,
                    children: <Widget>[
                      Table(
                          children: list)
                    ])
            )
      )

为什么添加padding小部件会引发此错误？
如何为卡添加填充和边距？

Answer 1

由于值为2，因此不会根据填充物说明容器的增长，它将向内填充，导致内部溢出。只需使用Container中提供的属性即可。
容器具有可以应用的padding和margin属性。您不必用填充物包裹您的Containers子项。

容器（子级：Text（），填充：EdgeInsets.all（5.0），边距：EdgeInsets.all（10.0））

有关可用的更多属性，请参见Container-class

添加Padding小部件后出现Flutter异常

1 个答案: