在 Flatlist React Native 中解析 JSON 对象

Question

我是 React Native 的新手，我正在开发一个像电子商务应用程序这样的应用程序，我使用 Woocommerce (Wordpress) 作为后端并通过 Woocomrce Api 响应我试图在我的 React Native 应用程序中实现，但是我有一个问题同时解析 JSON。基本上我不知道如何解析平面列表中的图像数组。下面提到了我的代码和 API 响应，我提醒您 item.images[0].src 不起作用。 提前谢谢你。

我的 Woocommerce API 响应

{
  "id": 794,
  "name": "Premium Quality",
  "slug": "premium-quality-19",
  "permalink": "https://example.com/product/premium-quality-19/",
  "date_created": "2017-03-23T17:01:14",
  "date_created_gmt": "2017-03-23T20:01:14",
  "date_modified": "2017-03-23T17:01:14",
  "date_modified_gmt": "2017-03-23T20:01:14",
  "type": "simple",
  "status": "publish",
  "featured": false,
  "catalog_visibility": "visible",
  "description": "<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>\n",
  "short_description": "<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.</p>\n",
  "sku": "",
  "price": "21.99",
  "regular_price": "21.99",
  "sale_price": "",
  "date_on_sale_from": null,
  "date_on_sale_from_gmt": null,
  "date_on_sale_to": null,
  "date_on_sale_to_gmt": null,
  "price_html": "<span class=\"woocommerce-Price-amount amount\"><span class=\"woocommerce-Price-currencySymbol\">&#36;</span>21.99</span>",
  "on_sale": false,
  "purchasable": true,
  "total_sales": 0,
  "virtual": false,
  "downloadable": false,
  "downloads": [],
  "download_limit": -1,
  "download_expiry": -1,
  "external_url": "",
  "button_text": "",
  "tax_status": "taxable",
  "tax_class": "",
  "manage_stock": false,
  "stock_quantity": null,
  "stock_status": "instock",
  "backorders": "no",
  "backorders_allowed": false,
  "backordered": false,
  "sold_individually": false,
  "weight": "",
  "dimensions": {
    "length": "",
    "width": "",
    "height": ""
  },
  "shipping_required": true,
  "shipping_taxable": true,
  "shipping_class": "",
  "shipping_class_id": 0,
  "reviews_allowed": true,
  "average_rating": "0.00",
  "rating_count": 0,
  "related_ids": [
    53,
    40,
    56,
    479,
    99
  ],
  "upsell_ids": [],
  "cross_sell_ids": [],
  "parent_id": 0,
  "purchase_note": "",
  "categories": [
    {
      "id": 9,
      "name": "Clothing",
      "slug": "clothing"
    },
    {
      "id": 14,
      "name": "T-shirts",
      "slug": "t-shirts"
    }
  ],
  "tags": [],
  "images": [
    {
      "id": 792,
      "date_created": "2017-03-23T14:01:13",
      "date_created_gmt": "2017-03-23T20:01:13",
      "date_modified": "2017-03-23T14:01:13",
      "date_modified_gmt": "2017-03-23T20:01:13",
      "src": "https://example.com/wp-content/uploads/2017/03/T_2_front-4.jpg",
      "name": "",
      "alt": ""
    },
    {
      "id": 793,
      "date_created": "2017-03-23T14:01:14",
      "date_created_gmt": "2017-03-23T20:01:14",
      "date_modified": "2017-03-23T14:01:14",
      "date_modified_gmt": "2017-03-23T20:01:14",
      "src": "https://example.com/wp-content/uploads/2017/03/T_2_back-2.jpg",
      "name": "",
      "alt": ""
    }
  ],
  "attributes": [],
  "default_attributes": [],
  "variations": [],
  "grouped_products": [],
  "menu_order": 0,
  "meta_data": [],
  "_links": {
    "self": [
      {
        "href": "https://example.com/wp-json/wc/v3/products/794"
      }
    ],
    "collection": [
      {
        "href": "https://example.com/wp-json/wc/v3/products"
      }
    ]
  }
}

我的 APP.js 代码

 import React, { Component } from 'react';
    import { View, Text, Image, Dimensions, ActivityIndicator, StatusBar, FlatList } from 'react-native';
    import WooCommerceAPI from 'react-native-woocommerce-api';

var WooCommerceApp = new WooCommerceAPI({
    url: 'http://store.oruga.in/', // Your store URL
    ssl: true,
    consumerKey: 'ck_113e04d8a91ce34cbfeaf21971b6d5e18e7XXXXX', // Your consumer secret
    consumerSecret: 'cs_fd0f4b6a5573837b1f7732a98dccb355a233XXXXX', // Your consumer secret
    wpAPI: true, // Enable the WP REST API integration
    version: 'wc/v3', // WooCommerce WP REST API version
    queryStringAuth: true
});

export default class App extends Component {
    constructor(props) {
        super(props);
        this.state = {
            responsedata: [],
            loading: true
        };
        WooCommerceApp.get('products/')
            .then(data => {
                this.setState({ responsedata: data }, () => {
                    this.setState({ loading: false });
                });
            })
            .catch(error => {
                console.log(error);
            });

    }

    render() {
        return (
            <View>
                <StatusBar hidden />
                {this.state.loading === true ? (
                    <View style={{ justifyContent: 'center', alignItems: 'center', height: Dimensions.get('window').height }}>
                        <ActivityIndicator size="large" color="#0f3443" />
                    </View>
                ) : (
                        <View>
                            <FlatList
                                data={this.state.responsedata}
                                keyExtractor={this._keyExtractor}
                                renderItem={({ item }) => (
                                    <View>
                                        <Image source={{ uri: item.images[0].src }} />
                                        <Text >{item.name}</Text>
                                    </View>

                                )} />
                        </View>)
                }
            </View>
        );
    }
}

Answer 1

我知道这是一个老问题，但答案可能对像我这样的其他人有所帮助。 我在使用 WC api 时也遇到过这种情况。 解决方案是使用

const image = item.images.slice(0,1).pop(); 从内部图像数组中获取第一个对象并使用

 <Image
        source={{ uri: image.src }}
        resizeMode={'contain'}
        style={{flex:1, width: '100%', height: 150 }}
    />

Answer 2

您应该将一个数组作为数据传递给您的FlatList，在您的示例中，您将一个 JSON 对象传递给您的平面列表，这就是它不呈现任何东西的原因。此外，您应该将高度和宽度传递给您的图像，否则它不会显示。

像这样更改您的平面列表，它应该可以工作。

<View>
  <FlatList
    data={this.state.responsedata.images}
    keyExtractor={item => `${item.id}`}
    renderItem={({ item }) => (
      <View>
        <Image style={{ height: 100, width: 100 }} source={{ uri: item.src }} />
        <Text>{item.name}</Text>
      </View>

    )}
  />
</View>

其他的，不要在你的构造函数中调用 setState，它会显示一个警告。将api调用移至componentDidMount函数：

componentDidMount() {
  WooCommerceApp.get('products/')
    .then((data) => {
      this.setState({ responsedata: data }, () => {
        this.setState({ loading: false });
      });
    })
    .catch((error) => {
      console.log(error);
    });
}

编辑： 如果你需要响应 json 那么你就不需要 FlatList，FlatList 是显示一个项目列表。如果您只想显示第一张图片，请像这样更改您的 FlatList

<Image style={{ height: 100, width: 100 }} source={{ uri: this.state.responsedata.images[0].src }} />