垂直可视窗口高度未被限定。
垂直可视窗口高度未被限定。
这是我的代码：
@override
Widget build(BuildContext context) {
return new Material(
color: Colors.deepPurpleAccent,
child: new Column(
mainAxisAlignment: MainAxisAlignment.center,
children:[new GridView.count(crossAxisCount: _column,children: new List.generate(_row*_column, (index) {
return new Center(
child: new CellWidget()
);
}),)]
)
);
}
以下是异常：
I/flutter ( 9925): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter ( 9925): The following assertion was thrown during performResize(): I/flutter ( 9925): Vertical viewport was given unbounded height. I/flutter ( 9925): Viewports expand in the scrolling direction to fill their container.In this case, a vertical I/flutter ( 9925): viewport was given an unlimited amount of vertical space in which to expand. This situation I/flutter ( 9925): typically happens when a scrollable widget is nested inside another scrollable widget. I/flutter ( 9925): If this widget is always nested in a scrollable widget there is no need to use a viewport because I/flutter ( 9925): there will always be enough vertical space for the children. In this case, consider using a Column I/flutter ( 9925): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size I/flutter ( 9925): the height of the viewport to the sum of the heights of its children. I/flutter ( 9925): I/flutter ( 9925): When the exception was thrown, this was the stack: I/flutter ( 9925): #0 RenderViewport.performResize. (package:flutter/src/rendering/viewport.dart:827:15) I/flutter ( 9925): #1 RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:880:6) I/flutter ( 9925): #2 RenderObject.layout (package:flutter/src/rendering/object.dart:1555:9)
admin 更改状态以发布 2023年5月20日
当你尝试把ListView / GridView放在Column中时，通常会发生这种情况，有许多解决方法，我在这里列出了几种。
-
将
ListView包装在Expanded中Column( children:
[ Expanded( // wrap in Expanded child: ListView(...), ), ], ) -
将
ListView包装在SizedBox中，并给予指定的heightColumn( children:
[ SizedBox( height: 400, // fixed height child: ListView(...), ), ], ) -
在
ListView中使用shrinkWrap: true。Column( children:
[ ListView( shrinkWrap: true, // use this ), ], )
