![](/img/trans.png)
[英]Navigation from the header of the bottom tab navigator in react native
[英]How to access a variable in header tab navigation in react native
我的選項卡標題中有一個開關,每次切換開關時,我都想在標題中獲取開關值的值。 我怎樣才能得到那個值?
const navigationOptions = ({ navigation }) => {
const { params = {} } = navigation.state;
return {
title: "Home",
headerTitleStyle: {
flex: 1,
textAlign: "center",
color: "white",
fontSize: 20,
},
headerTintColor: "white",
headerStyle: {
backgroundColor: "#4169E1",
},
headerRight: (
<Switch
onValueChange={() => params.handleSave()}
value={this.navigation.state.switchValue}
/>
),
};
};
class HomeScreen extends React.Component {
state = { switchValue: false };
componentDidMount() {
this.props.navigation.setParams({ handleSave: this.toggleSwitch });
}
toggleSwitch = (value) => {
//onValueChange of the switch this function will be called
this.setState({ switchValue: value });
//state changes according to switch
//which will result in re-render the text
};
}
每次更新導航選項中的參數值時,我都調用了 this.props.navigation.setParams
toggleSwitch = (value) => {
this.setState({ switchValue: value });
this.props.navigation.setParams({
switchValue: holder,
});
};
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.