feat(ReactPickerView): Add ReactPickerView

[ebragge]

ReactPicker provides access to native selector UI Components for React Native JavaScript applications.

Fixes #231

[ebragge]

Basic functionality works - labels, colors, value change, style

`<View

        <Switch 
            onValueChange={(value) => this.setState({eventSwitchIsOn: value}) }
            value={this.state.eventSwitchIsOn}/>            
        <Picker
            selectedValue={this.state.language}
            onValueChange={(lang) => this.setState({language: lang})}>   
            <Picker.Item label="Java" value="java" color='blue' testID='1'/>
            <Picker.Item label="JavaScript" value="js" color='red' testID='2'/>
            <Picker.Item label="C++" value="cpp" color='green' testID='3'/>
            <Picker.Item label="C#" value="cs" color='yellow' testID='4'/>
            <Picker.Item label="C" value="c" color='magenta' testID='5'/>
        </Picker>
        <Picker
            style={{width: 100, height: 40}}
            selectedValue={this.state.language}
            enabled={this.state.eventSwitchIsOn}
            onValueChange={(lang) => this.setState({language: lang})}>   
            <Picker.Item label="Java" value="java" color='blue' testID='1'/>
            <Picker.Item label="JavaScript" value="js" color='red' testID='2'/>
            <Picker.Item label="C++" value="cpp" color='green' testID='3'/>
            <Picker.Item label="C#" value="cs" color='yellow' testID='4'/>
            <Picker.Item label="C" value="c" color='magenta' testID='5'/>
        </Picker>

`

...

[rozele]

We have to keep everything working on iOS and Android, I don't think we can comment these out.

[rozele]

See https://github.com/facebook/react-native/blob/master/Libraries/Picker/PickerIOS.android.js.

You'll want to name this file PickerIOS.windows.js #Closed

[ebragge]

Done

[rozele]

Can you also make sure this outputs an "UnimplementedView", i.e.:
module.exports = require('UnimplementedView');

---

In reply to: 56820832 [](ancestors = 56820832)

[rozele]

Do we need this constant, since it has custom measurement? #Closed

[ebragge]

Removed

[rozele]

👍