javascript - 在 ImageBackground 中添加要要求的变量

Question

我正在使用来自 react-native lib 的 ImageBackground。ImageBackground 使用 source={require('asd.png')} 例如。

但我试图在里面添加变量来要求。

const [image,setImage] = useState('./asd.png')

.then(image => {
            setImage(image.path) // gives 'something.png'
          });

<ImageBackground source={require(image)></ImageBackground> 

但我收到错误。第 122 行的无效调用：require(image)

Answer 1

// Declare a varible here...
const img = require('./asd.png')  

// Example of a network image
const networkImage = "https://images.pexels.com/photos/799443/pexels-photo-799443.jpeg"  

const [image, setImage] = useState(img) // Use it here like this

// Static Image Usage
<ImageBackground 
    source={image} 
    style={{ flex: 1, resizeMode: 'cover', justifyContent: 'center' }}>
</ImageBackground> 

// Network Image Usage
<ImageBackground 
    source={{uri : networkImage}} 
    style={{ flex: 1, resizeMode: 'cover', justifyContent: 'center' }}>
</ImageBackground> 

这是正确的使用方法ImageBackground

检查此小吃以查看工作示例

此外，请查看文档以获取更多帮助。

正如文档所说，

// GOOD (this is also correct)
<Image source={require('./my-icon.png')} />;

// BAD (this is wrong...)
var icon = this.props.active
  ? 'my-icon-active'
  : 'my-icon-inactive';
<Image source={require('./' + icon + '.png')} />;

// GOOD (this is correct)
var icon = this.props.active
  ? require('./my-icon-active.png')
  : require('./my-icon-inactive.png');
<Image source={icon} />;