react-native/Examples/UIExplorer/AppStateIOSExample.js

70 lines
1.7 KiB
JavaScript

/**
* Copyright 2004-present Facebook. All Rights Reserved.
*
* @providesModule AppStateIOSExample
*/
'use strict';
var React = require('react-native');
var {
AppStateIOS,
Text,
View
} = React;
var AppStateSubscription = React.createClass({
getInitialState() {
return {
appState: AppStateIOS.currentState,
previousAppStates: [],
};
},
componentDidMount: function() {
AppStateIOS.addEventListener('change', this._handleAppStateChange);
},
componentWillUnmount: function() {
AppStateIOS.removeEventListener('change', this._handleAppStateChange);
},
_handleAppStateChange: function(appState) {
var previousAppStates = this.state.previousAppStates.slice();
previousAppStates.push(this.state.appState);
this.setState({
appState,
previousAppStates,
});
},
render() {
if (this.props.showCurrentOnly) {
return (
<View>
<Text>{this.state.appState}</Text>
</View>
);
}
return (
<View>
<Text>{JSON.stringify(this.state.previousAppStates)}</Text>
</View>
);
}
});
exports.title = 'AppStateIOS';
exports.description = 'iOS app background status';
exports.examples = [
{
title: 'AppStateIOS.currentState',
description: 'Can be null on app initialization',
render() { return <Text>{AppStateIOS.currentState}</Text>; }
},
{
title: 'Subscribed AppStateIOS:',
description: 'This changes according to the current state, so you can only ever see it rendered as "active"',
render() { return <AppStateSubscription showCurrentOnly={true} />; }
},
{
title: 'Previous states:',
render() { return <AppStateSubscription showCurrentOnly={false} />; }
},
];