像 btns 这样的 facebook 一样,在 flatlist 中单独更改特定组件的状态 [英] Change the state of particular component individually in flatlist as in facebook like btns
问题描述
我在一个平面列表中有一个类似图标的列表.如果单击特定图标,我想更改颜色.但是如果我使用 likeStatus 状态来执行它并单击任何图标,那么所有图标的颜色都会改变.如何使用状态在平面列表中单独处理单个图标?我尝试了很多,但徒劳无功.任何帮助表示赞赏.提前致谢
I've a lists of like icons in a flatlist. I want to change the color if the particular icon is clicked. But if I use likeStatus state to do it and click any icon, then the color of all the icons will change. How can I treat individual icon separately in flatlist using state? I've tried a lot but in vain. Any help is appreciated. Thanks in advance
constructor(props) {
super(props);
this.state = {
isLoading: true,
likeStatus: null,
};
}
componentDidMount() {
this._reload();
}
_reload = () => {
return fetch(url)
.then(response => response.json())
.then(responseJson => {
this.setState({
isLoading: false,
data: responseJson.data
});
})
.catch(error => {
console.log(error);
});
};
likePost = item => {
this.setState({
likeStatus: !item.like_status
});
if (this.state.likeStatus == true) {
ToastAndroid.show(`You have unliked the post`, ToastAndroid.SHORT);
} else {
ToastAndroid.show(`You have liked the post`, ToastAndroid.SHORT);
}
fetch(likeUploadUrl, {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
post_id: item.id,
user_id: item.user_id
})
})
.then(response => response.json())
.then(responseJson => {
console.log("likeResponse", responseJson);
})
.catch(error => {
});
};
_renderItem = item => {
return (
_ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _
<TouchableOpacity
activeOpacity={0.5}
onPress={() => this.likePost(item.item)}
style={{ flexDirection: "row" }} >
{item.item.like_status != null &&
item.item.like_status != false ? (
<FontAwesome5
name={"heart"}
size={15}
style={{color: "blue" }}
/>
) : (
<FontAwesome5
name={"heart"}
size={15}
style={{ color: "gray" }}
/>
)}
</TouchableOpacity>
);
};
render() {
return(
<FlatList
data={this.state.data}
renderItem={this._renderItem}
/>
);
}
推荐答案
这个问题有很多解决方案,但我的建议是这个
There are many solutions to this problem but my suggestion is this
在您的主 .js 文件中,像这样更改渲染.
In your main .js file change render like this.
render() {
return(
<FlatList
data={this.state.data}
renderItem={(item) => <MyItem item={item}/>}
/>
);
}
//in MyItem.js
export default class MyItem extends React.Component {
constructor(props){
super(props);
this.state={
like_status: false;
};
}
likePost = item => {
this.setState({
like_status: !this.state.like_status
});
if (this.state.likeStatus == true) {
ToastAndroid.show(`You have unliked the post`, ToastAndroid.SHORT);
} else {
ToastAndroid.show(`You have liked the post`, ToastAndroid.SHORT);
}
fetch(likeUploadUrl, {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify({
post_id: item.id,
user_id: item.user_id
})
})
.then(response => response.json())
.then(responseJson => {
console.log("likeResponse", responseJson);
})
.catch(error => {
});
};
render(){
return (
_ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _
<TouchableOpacity
activeOpacity={0.5}
onPress={() => this.likePost(this.props.item.item)}
style={{ flexDirection: "row" }} >
{this.state.like_status != null &&
this.state.like_status != false ? (
<FontAwesome5
name={"heart"}
size={15}
style={{color: "blue" }}
/>
) : (
<FontAwesome5
name={"heart"}
size={15}
style={{ color: "gray" }}
/>
)}
</TouchableOpacity>
);
}
}
这是一个干净的方法来做到这一点.只需在另一个类中呈现您的 FlatList 项目,这样您就可以为每个项目拥有单独的状态.
This is a clean way to do this. Just render your FlatList items in another class so that you can have a separate state for each item.
这篇关于像 btns 这样的 facebook 一样,在 flatlist 中单独更改特定组件的状态的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!