Props
onValueChange 函数型
selectedValue 任意类型
例子
use strict;var React = require(react-native);var { PickerIOS, Text, View, } = React;var PickerItemIOS = PickerIOS.Item;var CAR_MAKES_AND_MODELS = { amc: { name: AMC, models: [AMX, Concord, Eagle, Gremlin, Matador, Pacer], }, alfa: { name: Alfa-Romeo, models: [159, 4C, Alfasud, Brera, GTV6, Giulia, MiTo, Spider], }, aston: { name: Aston Martin, models: [DB5, DB9, DBS, Rapide, Vanquish, Vantage], }, audi: { name: Audi, models: [90, 4000, 5000, A3, A4, A5, A6, A7, A8, Q5, Q7], }, austin: { name: Austin, models: [America, Maestro, Maxi, Mini, Montego, Princess], }, borgward: { name: Borgward, models: [Hansa, Isabella, P100], }, buick: { name: Buick, models: [Electra, LaCrosse, LeSabre, Park Avenue, Regal, Roadmaster, Skylark], }, cadillac: { name: Cadillac, models: [Catera, Cimarron, Eldorado, Fleetwood, Sedan de Ville], }, chevrolet: { name: Chevrolet, models: [Astro, Aveo, Bel Air, Captiva, Cavalier, Chevelle, Corvair, Corvette, Cruze, Nova, SS, Vega, Volt], }, };var PickerExample = React.createClass({ getInitialState: function() { return { carMake: cadillac, modelIndex: 3, }; }, render: function() { var make = CAR_MAKES_AND_MODELS[this.state.carMake]; var selectionString = make.name + + make.models[this.state.modelIndex]; return ( <View> <Text>Please choose a make for your car:</Text> <PickerIOS selectedValue={this.state.carMake} onValueChange={(carMake) => this.setState({carMake, modelIndex: 0})}> {Object.keys(CAR_MAKES_AND_MODELS).map((carMake) => ( <PickerItemIOS key={carMake} value={carMake} label={CAR_MAKES_AND_MODELS[carMake].name} /> ) )} </PickerIOS> <Text>Please choose a model of {make.name}:</Text> <PickerIOS selectedValue={this.state.modelIndex} key={this.state.carMake} onValueChange={(modelIndex) => this.setState({modelIndex})}> {CAR_MAKES_AND_MODELS[this.state.carMake].models.map( (modelName, modelIndex) => ( <PickerItemIOS key={this.state.carmake + _ + modelIndex} value={modelIndex} label={modelName} /> )) } </PickerIOS> <Text>You selected: {selectionString}</Text> </View> ); }, }); exports.title = <PickerIOS>; exports.description = Render lists of selectable options with UIPickerView.; exports.examples = [ { title: <PickerIOS>, render: function(): ReactElement { return <PickerExample />; }, }];
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