[React Native]map遍历以及获取图片尺寸

1.array里面装了图片

state = {
        array: [image_1, image_2, image_3, image_4, image_5,image_kc1,image_kc2,image_kc3,image_kc4,image_kc5],
      }

 2.遍历这些图片:

renderChildren() {
        return this.state.array.map((i, key) => {
              return (
                <View style={this.getChildrenStyle(i)} key={key}>
                <Text>{key}</Text>
                  <Image source={i}/>
                </View>
              ); 
            }, this);
      }

上面使用了map遍历,key是index,i是value. key={key}不可或缺,否则报错.

 

获取图片尺寸:

import resolveAssetSource from 'resolveAssetSource';

getChildrenStyle(i) {
        return {
          width: resolveAssetSource(i).width,
          height: resolveAssetSource(i).height,
        };
      }

通过上面的遍历,传入的i,可以获得item,然后获取高度和宽度