Question

const AppStackLog = createDrawerNavigator(
  {

    Login: {
      screen: LogintStack,
      navigationOptions: (navOpt) => ({
        drawerLabel: ({focused}) =>(
        <TouchableOpacity style={[styles.button]} onPress={() => this.navigation.navigate('App')}>
         <Text><Icon

            size={17}
            name="log-in"
            family="Galio"
            color={focused ? 'white' : materialTheme.COLORS.MUTED} />
       <Text size={18}>        Logout</Text></Text>       
      </TouchableOpacity>
        ),
      }),
    },



  },
  Menu
);

export default createSwitchNavigator(
  {
    App: AppStack,
    Home: HomeStack,
    Auth:AppStackLog,
  },
  {
    initialRouteName: 'App',
  }
);

Answer 1

let pdf = new jsPDF('p', 'pt', 'a4'); let left = 36; // narrow margin - 12.7 mm let srcwidth = document.getElementById('html').style.width; let scale = (595.28 - left * 2) / Math.ceil(srcwidth.replace('px','')); // a4 pageSize 595.28 pdf.html(document.getElementById('html'), { html2canvas: { scale: scale // default is window.devicePixelRatio, }, x: left, y: 36, callback: function () { window.open(pdf.output('bloburl')); } });不会指向某个特定的组件，而是指向this等于定义此代码时的任何内容。相反，navOpt参数具有您所需要的：

this

React-native：unpress不是一个对象（评估'_this.props.navigation.navigate'）

1 个答案: