React Native 将状态中的数组值应用为 Picker 项

问题描述：

我的 state 中有一个名为 Categories 的数组.

I have an array in my state named Categories.

这些是它的值:['Food', 'Home', 'Savings'].

我的目标是我需要将它们呈现为 Picker.items 供我的用户选择.

My goal is that I need them to be rendered as Picker.items for my user to select.

这怎么可能?

我尝试在 Picker 对象中使用 ListView，但是当我导航到该页面时，

I tried using ListView inside a Picker object, but when I navigate to that page,

AppName 停止工作

AppName stopped Working

提示.

答

你不需要在选择器

var options ={
    "1": "Home",
    "2": "Food",
    "3": "Car",
    "4": "Bank",
};

<Picker
    style={{your_style}}
    mode="dropdown"
    selectedValue={this.state.selected}
    onValueChange={()=>{}}>
    {Object.keys(options).map((key) => {
        return (<Picker.Item label={this.props.options[key]} value={key} key={key}/>) //if you have a bunch of keys value pair
    })}
</Picker>

2) 当你有一个值数组时

2) When you have an array of values

var options =["Home","Savings","Car","GirlFriend"];

<Picker
    style={{your_style}}
    mode="dropdown"
    selectedValue={this.state.selected}
    onValueChange={()=>{}}> //add your function to handle picker state change
    {options.map((item, index) => {
        return (<Picker.Item label={item} value={index} key={index}/>) 
    })}
</Picker>

React Native 将状态中的数组值应用为 Picker 项

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