How to put ImageBackground with resizeMode set to "contain" at the top?

Question

I'm currently displaying a background image on my React Native app using the following code:

<ImageBackground 
   source={myImage} 
   style={{ width:'100%', height:'100%' }} 
   imageStyle={{resizeMode: 'contain'}}
>
....
</ImageBackground>

I don't want my image to stretch and the resizeMode: 'contain' does perfectly this job. In this way the image won't cover all my screen but only a portion of it and this is exactly what I want to achieve.

My issue is that the image is vertical aligned at the center with the code I shown above while I would like it to stick at the top. So it should keep proportions and stick at the top. I tried to use position:'absolute' and top:0 in the imageStyle property but it doesn't work.

I saw this question which apparently explain my same problem but it doesn't provide a solution to my issue.

Do you have any suggestion?

Answer 1

try this:

import {Dimensions} from 'react-native'

    constructor(props) {
      super(props);
      this.state = { height: 0 };
    }

    componentDidMount(){
          Image.getSize(imgUrl, (srcWidth, srcHeight) => {
             const maxHeight = Dimensions.get('window').height; 
             const maxWidth = Dimensions.get('window').width;
             const ratio = Math.min(maxWidth / srcWidth, maxHeight / srcHeight);
             this.setState({ height: srcHeight * ratio})
          })
    } 

    <ImageBackground 
       source={myImage} 
       style={{ flex:1 }} 
       resizeMode= 'contain'
       imageStyle={height: this.state.height, width:Dimensions.get('window').width}
    >
    ....
    </ImageBackground>

ImageBackground as the same props as Image so resizeMode is a prop not a style
See this: https://facebook.github.io/react-native/docs/imagebackground