為了查看當(dāng)前的狀態(tài)，你可以檢查 AppStateIOS.currentState，該方法會(huì)一直保持最新?tīng)顟B(tài)。然而，當(dāng) AppStateIOS 在橋接器上檢索currentState時(shí)，在啟動(dòng)時(shí)它將會(huì)為空。

    getInitialState: function() {
      return {
        currentAppState: AppStateIOS.currentState,
      };
    },
    componentDidMount: function() {
      AppStateIOS.addEventListener('change', this._handleAppStateChange);
    },
    componentWillUnmount: function() {
      AppStateIOS.removeEventListener('change', this._handleAppStateChange);
    },
    _handleAppStateChange: function(currentAppState) {
      this.setState({ currentAppState, });
    },
    render: function() {
      return (
       <Text>Current state is: {this.state.currentAppState}</Text>
      );
    },

這個(gè)例子似乎只能說(shuō)"當(dāng)前狀態(tài)是：活躍的"因?yàn)樵?active 狀態(tài)時(shí)，應(yīng)用程序只對(duì)用戶是可見(jiàn)的，空狀態(tài)只能是暫時(shí)的。

方法

static addEventListener(type: string, handler: Function)

通過(guò)監(jiān)聽(tīng) change 事件類型和提供處理程序，為應(yīng)用程序狀態(tài)變化添加一個(gè)處理程序。

static removeEventListener(type: string, handler: Function)

通過(guò)傳遞 change 事件類型和處理程序，刪除一個(gè)處理程序。

例子

Edit on GitHub

    '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(): ReactElement { return <AppStateSubscription showCurrentOnly={true} />; }
      },
      {
        title: 'Previous states:',
        render(): ReactElement { return <AppStateSubscription showCurrentOnly={false} />; }
      },
    ];

上一篇：安裝 Android 運(yùn)行環(huán)境下一篇：應(yīng)用程序注冊(cè)表

在线观看不卡亚洲电影_亚洲妓女99综合网_91青青青亚洲娱乐在线观看_日韩无码高清综合久久

iOS 應(yīng)用程序狀態(tài)

iOS 應(yīng)用程序狀態(tài)

基本用法

方法

例子