React-Native View 以显式设置的宽度/高度呈现，但 flexBasis 为 0

Question

在 React-native 0.39 中，

我经常收到这个错误，但我真的不明白为什么(显然我没有设置 flexGrow ......)。

这是来自控制台的错误

View was rendered with explicitly set width/height but with a 0 flexBasis. (This might be fixed by changing flex: to flexGrow:) View: <RCTShadowView: 0x6080005a02a0; viewName: RCTView; reactTag: 2608; frame: {{0, 0}, {nan, nan}}>

有人可以向我解释为什么会触发此错误吗？

编辑 :错误来自我在主 View 中添加的这段样板代码:

flex: 1,
// remove width and height to override fixed static size
width: null,
height: null,

但是，如果有人可以阐明 react-native 样式或引导我找到好的资源，我将不胜感激 :)

Answer 1

引用 react-native/React/Views/RCTShadowView.m ，有评论

    This works around a breaking change in css-layout where setting flexBasis needs to 
be set explicitly, instead of relying on flex to propagate.

    We check for it by seeing if a width/height is provided along with a flexBasis  
of 0 and the width/height is laid out as 0.

当 时触发错误没有定义 flexBasis 且宽度和高度为零的 flex .

引用 react-native/Libraries/StyleSheet/LayoutPropTypes.js ，我们知道 flexGrow、flexShrink 和 flexBasis 接收数字值。

有关视觉指南，您可以引用此网页， A Visual Guide to CSS3 Flexbox Properties .