iOS选择器震动反馈 iOS 选择器

Props

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onValueChange 函数型

selectedValue 任意类型

例子

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"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 />;
  },
}];