选中 - 未选中在 ListView 中不起作用 - React Native [英] Checked - Unchecked doesn't working in ListView - React Native

问题描述

朋友我将集成选中 - 在列表视图中取消选中.这样当用户单击选中然后将数据存储在数组中并取消选中时，我将删除数据.它工作正常，但 UI 不会在选中后更新 - 未选中.

friend I Will integrated checked - unchecked in listView. So that When user click on checked then store the data in Array and unchecked then i will remove the data. Its working fine, But the UI Will not updated after checked - unchecked.

<List containerStyle={{marginTop : 0 , borderBottomWidth : 0 , borderBottomColor : 'black', borderTopWidth : 0}}>
  <FlatList
    data={this.state.list}
    renderItem={({ item }) => (
      <ListItem containerStyle={{height: 80, backgroundColor : 'transparent', borderBottomWidth : 0, borderTopWidth : 0}}
        title={
          <View style={styles.titleView}>
            <Text style={styles.ratingText}>{item.iWorkerID.vFirstName}</Text>
          </View>
        }
        rightIcon={
           <TouchableOpacity onPress = {() => this.selectedWorker(item)} style={{width: 30, height: 30 , marginTop : 10, marginRight : 30}}>
             <Image style = {{width: 30, height: 30}} source={this.state.selectedList.includes(item) ? require("./Images/uncheckd.png") : require("./Images/checked.png")}/>
             {/* {this.state.selectedList.includes(item) && <Image style = {{width: 30, height: 30}} source={require("./Images/uncheckd.png")}/>}
             {!this.state.selectedList.includes(item) && <Image style = {{width: 30, height: 30}} source={require("./Images/checked.png")}/>} */}

           </TouchableOpacity>
        }
        avatar={<Avatar
          rounded
          medium
          containerStyle={{marginLeft: 30}}
          source={{uri: Globle.IMAGE_URL+item.vProfileImage}}
          activeOpacity={0.7}
        />}
      />
    )}
  />
</List>

在选中/取消选中按钮上，我将从数组中添加/删除对象，

And on the check/uncheck button, I will add/remove object from array,

selectedWorker = (data) =>{
  console.log('data is ', data);

  if (!this.state.selectedList.includes(data)) {
      // this.setState({ selectedList : [...this.state.selectedList , data]})
      this.state.selectedList.push(data);
  } else {

    var index = this.state.selectedList.indexOf(data);
    if (index > -1) {
        this.state.selectedList.splice(index, 1);
    }
  }

  this.setState({list : this.state.list})
  console.log('selected list' , this.state.selectedList);
}

主要问题:想要根据 selectedList 数组更新选中/取消选中的图像，我如何更新 listView 中的项目.

Main Issue : Want to update image checked/unchecked according to selectedList array, How can i Update item in listView.

在 selectedWorker 方法中做什么.

What to do inside selectedWorker method.

动图:

推荐答案

您在 List 中使用了 Flatelist，两者都是列出项目的组件.您可以使用 List 或 Flatelist，但不能同时使用两者.希望能帮到你..

you are using Flatelist inside List, Both are a component to listing items. you can use List or Flatelist, not both. I hope it will help you..

我尝试使 Demo 与您想要的相似.

I try to make Demo similar to that you want.

constructor(props) {
    super(props)
    this.state = {
        list: [
            {
                id: 1,
                name: "Harpal Singh Jadeja",
                avtar: "https://cdn.pixabay.com/photo/2016/08/08/09/17/avatar-1577909_960_720.png"
            },
            {
                id: 2,
                name: "Kirit Mode",
                avtar: "https://cdn.pixabay.com/photo/2016/08/08/09/17/avatar-1577909_960_720.png"
            },
            {
                id: 3,
                name: "Rajiv Patil",
                avtar: "https://cdn.pixabay.com/photo/2016/08/08/09/17/avatar-1577909_960_720.png"
            },
            {
                id: 4,
                name: "Chetan Doctor",
                avtar: "https://cdn.pixabay.com/photo/2016/08/08/09/17/avatar-1577909_960_720.png"
            }]


    };
};


renderListItem = (index, item) => {
    return (
        <View style={styles.notification_listContainer}>
            <Image source={{uri: item.avtar, cache: 'force-cache'}}
                   style={circleStyle}/>

            <View style={{flex: 1, paddingLeft: 10, justifyContent: 'center'}}>
                <Label roboto_medium
                       align='left'
                       color={Color.TEXT_PRIMARY}
                       numberOfLines={1}>
                    {item.name}
                </Label>
                <Label roboto_medium
                       small
                       align='left'
                       color={Color.TEXT_SECONDARY}
                       mt={8}>
                    Programmer
                </Label>
            </View>

            <View style={{justifyContent: 'center'}}>
                <TouchableHighlight
                    style={{
                        backgroundColor: item.isSelected ? Color.BLACK : Color.TEXT_SECONDARY,
                        alignItems: 'center',
                        justifyContent: 'center',
                        height: 40,
                        width: 40,
                        borderRadius: 20
                    }}
                    onPress={this.onSelectWorker.bind(this, index, item)} underlayColor={Color.BLACK}>
                    <Icon name='done'
                          size={20}
                          color={Color.WHITE}/>
                </TouchableHighlight>
            </View>
        </View>
    );

};
onSelectWorker = (index, item) => {
    console.log("Selected index : ", index);
    let tempList = this.state.list;
    tempList[index].isSelected = tempList[index].isSelected ? false : true
    this.setState({
        list: tempList
    });

};
render() {
    return (
        <View style={styles.notification_Container}>
            <FlatList
                data={this.state.list}
                renderItem={
                    ({index, item}) => this.renderListItem(index, item)
                }
                keyExtractor={item => item.id}
                extraData={this.state}
            />
        </View>
    )
}

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