我正在编写一个React Native应用程序,我正在使用React Navigation(V2)。在我的组件更新后,我想更新navigationOptions
并添加一个新按钮。这是我尝试过的代码:
static navigationOptions = ({ navigation }) => {
const options = {
headerTitle: SCREEN_TEXT_MENU_HEADER,
headerStyle: {
borderBottomWidth: 0,
marginBottom: -5
}
};
if (navigation.getParam("drawer", true)) {
options["headerLeft"] = (
<HeaderIconButton
onClick={() => {
navigation.openDrawer();
}}
icon={require("../../assets/icons/burgerMenu.png")}
/>
);
}
if (navigation.getParam("renderBillButton", false)) {
options["headerRight"] = (
<HeaderIconButton
onClick={() => {
navigation.navigate("BillScreen");
}}
type="primary"
icon={require("../../assets/icons/euro.png")}
/>
);
}
return options;
};
componentDidUpdate = prevProps => {
const { navigation, orders } = this.props;
if (prevProps.orders.length !== orders.length) {
navigation.setParams({
renderBillButton: orders.length > 0
});
}
};
这种方法的问题是,navigationOptions
在componentDidUpdate()
之后不会被重置。如何使用React Navigation动态调整标题?
您可以使用this.props.navigation.setParams()
函数来更新导航状态参数。
参考:https://reactnavigation.org/docs/en/headers.html#updating-navigationoptions-with-setparams
好的,这里出了什么问题:我还必须在componentDidMount()
中调用相同的代码,否则在加载时不会影响页面。所以除了我的问题的代码,我补充说:
componentDidMount = () => {
const { navigation, order } = this.props;
navigation.setParams({
renderBillButton: orders.length > 0
});
}