iOS 选择器

Props

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onValueChange 函数型

selectedValue 任意类型

例子

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  1. 'use strict';
  2. var React = require('react-native');
  3. var {
  4.   PickerIOS,
  5.   Text,
  6.   View,
  7. } = React;
  8. var PickerItemIOS = PickerIOS.Item;
  9. var CAR_MAKES_AND_MODELS = {
  10.   amc: {
  11.     name: 'AMC',
  12.     models: ['AMX', 'Concord', 'Eagle', 'Gremlin', 'Matador', 'Pacer'],
  13.   },
  14.   alfa: {
  15.     name: 'Alfa-Romeo',
  16.     models: ['159', '4C', 'Alfasud', 'Brera', 'GTV6', 'Giulia', 'MiTo', 'Spider'],
  17.   },
  18.   aston: {
  19.     name: 'Aston Martin',
  20.     models: ['DB5', 'DB9', 'DBS', 'Rapide', 'Vanquish', 'Vantage'],
  21.   },
  22.   audi: {
  23.     name: 'Audi',
  24.     models: ['90', '4000', '5000', 'A3', 'A4', 'A5', 'A6', 'A7', 'A8', 'Q5', 'Q7'],
  25.   },
  26.   austin: {
  27.     name: 'Austin',
  28.     models: ['America', 'Maestro', 'Maxi', 'Mini', 'Montego', 'Princess'],
  29.   },
  30.   borgward: {
  31.     name: 'Borgward',
  32.     models: ['Hansa', 'Isabella', 'P100'],
  33.   },
  34.   buick: {
  35.     name: 'Buick',
  36.     models: ['Electra', 'LaCrosse', 'LeSabre', 'Park Avenue', 'Regal',
  37.              'Roadmaster', 'Skylark'],
  38.   },
  39.   cadillac: {
  40.     name: 'Cadillac',
  41.     models: ['Catera', 'Cimarron', 'Eldorado', 'Fleetwood', 'Sedan de Ville'],
  42.   },
  43.   chevrolet: {
  44.     name: 'Chevrolet',
  45.     models: ['Astro', 'Aveo', 'Bel Air', 'Captiva', 'Cavalier', 'Chevelle',
  46.              'Corvair', 'Corvette', 'Cruze', 'Nova', 'SS', 'Vega', 'Volt'],
  47.   },
  48. };
  49. var PickerExample = React.createClass({
  50.   getInitialState: function() {
  51.     return {
  52.       carMake: 'cadillac',
  53.       modelIndex: 3,
  54.     };
  55.   },
  56.   render: function() {
  57.     var make = CAR_MAKES_AND_MODELS[this.state.carMake];
  58.     var selectionString = make.name + ' ' + make.models[this.state.modelIndex];
  59.     return (
  60.       <View>
  61.         <Text>Please choose a make for your car:</Text>
  62.         <PickerIOS
  63.           selectedValue={this.state.carMake}
  64.           onValueChange={(carMake) => this.setState({carMake, modelIndex: 0})}>
  65.           {Object.keys(CAR_MAKES_AND_MODELS).map((carMake) => (
  66.             <PickerItemIOS
  67.               key={carMake}
  68.               value={carMake}
  69.               label={CAR_MAKES_AND_MODELS[carMake].name}
  70.               />
  71.             )
  72.           )}
  73.         </PickerIOS>
  74.         <Text>Please choose a model of {make.name}:</Text>
  75.         <PickerIOS
  76.           selectedValue={this.state.modelIndex}
  77.           key={this.state.carMake}
  78.           onValueChange={(modelIndex) => this.setState({modelIndex})}>
  79.           {CAR_MAKES_AND_MODELS[this.state.carMake].models.map(
  80.             (modelName, modelIndex) => (
  81.               <PickerItemIOS
  82.                 key={this.state.carmake + '_' + modelIndex}
  83.                 value={modelIndex}
  84.                 label={modelName}
  85.               />
  86.             ))
  87.           }
  88.         </PickerIOS>
  89.         <Text>You selected: {selectionString}</Text>
  90.       </View>
  91.     );
  92.   },
  93. });
  94. exports.title = '<PickerIOS>';
  95. exports.description = 'Render lists of selectable options with UIPickerView.';
  96. exports.examples = [
  97. {
  98.   title: '<PickerIOS>',
  99.   render: function(): ReactElement {
  100.     return <PickerExample />;
  101.   },
  102. }];