Dynamically hide/show header in react-native

问题:

I am using react-navigation for routing purpose. I want to dynamically hide or show header on one component. Any way to do it?

I change headerLeft dynamically like this but can not find any way to do it for entire header.

static navigationOptions = ({ navigation }) => ({
    headerRight: navigation.state.params ? navigation.state.params.headerRight : null
});

this.props.navigation.setParams({
        headerRight: (
            <View>
                <TouchableOpacity onPress={() => blaa} >
                     <Text>Start</Text>
                </TouchableOpacity>
            </View>
        )
});

I want something like this - hide/show header based on state:

this.props.navigation.setParams({
        header: this.state.header
});

回答1:

Got it working:

Don't know why it is so but passing undefined to header will show default header and null will hide the header.

I am doing something like this:

static navigationOptions = ({ navigation }) => ({
    header: navigation.state.params ? navigation.state.params.header : undefined
});

and on state change;

this.props.navigation.setParams({ 
        header: null 
});

回答2:

According to the docs, setting the header to null hides the header. Go about it like this

this.props.navigation.setParams({
  header: this.state.header ? whatever-you-want : null
})