英文:

How do I install React Native Skia so that I can use it with an Expo project and see it working in Expo Go?

问题 {#heading}

我一直在尝试启动一个项目，该项目将使用React Native Skia来绘制类似HTML Canvas的图形。我已经设置了一个Expo项目，并运行了以下命令 - npx expo install @shopify/react-native-skia。

当我尝试在Expo GO中打开项目时，我收到以下消息：

Uncaught Error
无法读取未定义的属性'displayName'

我认为这是从withDevTools.js中调用的，我认为它是Expo捆绑软件的一部分。

只有当我尝试在项目中使用Skia时才会发生这种情况，否则不会发生？

我尝试运行基本的Skia示例，如下所示：

import { Canvas, Circle, Group } from "@shopify/react-native-skia";
`export const HelloWorld = () => {
const size = 256;
const r = size * 0.33;
return (
<Canvas style={{ flex: 1 }}>
<Group blendMode="multiply">
<Circle cx={r} cy={r} r={r} color="cyan" />
<Circle cx={size - r} cy={r} r={r} color="magenta" />
<Circle
cx={size / 2}
cy={size - r}
r={r}
color="yellow"
/>
</Group>
</Canvas>
);
};
`

在下面链接的Skia安装指南中，它说要在ios目录上运行pod install。我还没有执行这一步，因为Expo尚未创建我可以找到的ios目录。任何帮助将不胜感激。

https://shopify.github.io/react-native-skia/docs/getting-started/installation 英文:

I've been trying to start a project which will use React Native Skia to draw HTML Canvas like graphics. I've set up an Expo project and ran the following command - npx expo install @shopify/react-native-skia.

When I try to open the project in Expo GO I get the following message:

Uncaught Error
Cannot read property 'displayName' of undefined

This is being called from withDevTools.js which I assume is part of the Expo bundling software.

This only happens if I try to use Skia in the project but not otherwise?

I tried to run the basic Skia example as follows:

import {Canvas, Circle, Group} from "@shopify/react-native-skia";
`export const HelloWorld = () => {
const size = 256;
const r = size * 0.33;
return (
<Canvas style={{ flex: 1 }}>
<Group blendMode="multiply">
<Circle cx={r} cy={r} r={r} color="cyan" />
<Circle cx={size - r} cy={r} r={r} color="magenta" />
<Circle
cx={size/2}
cy={size - r}
r={r}
color="yellow"
/>
</Group>
</Canvas>
);
};
`

Within the Skia Installation guide linked below it says run pod install on the ios directory. I have not do this step as Expo has not created an ios directory that I can find? Any help would be appreciated.

https://shopify.github.io/react-native-skia/docs/getting-started/installation

答案1 {#1}

得分: 1

我也遇到了这个问题。原来你需要在你的 App.js 文件中设置默认导出。

也就是说，你需要这样写 export default HelloWorld = () => { ...。 英文:

I had this issue as well. Turns out that you need a default export in your App.js.

i.e. you need export default HelloWorld = () => { ... instead.