react native - Setting NavigationBar's title asynchronously -

-

i trying set navigationbar navigator. when display static title, ok. however, when try set title asynchronously (for example when go user's profile route, user's display name api , set this.props.navigation.title when api call promise resolves) title gets jumpy.

what proper approach issue?

here component (which connected redux store) handles navigationbar:

import react 'react-native'; let {     component,     navigator,     view } = react;  import {connect} 'react-redux';  let navigationbarroutemapper = {     title: (route, navigator, index, navstate) => {         return (             <text style={{margintop: 15, fontsize: 18, color: colors.white}}>{this.props.navigation.title}</text>         );     } };  class app extends component {     render() {          return (             <view style={{flex: 1}}>                 <navigator                     ref={'navigator'}                     configurescene={...}                     navigationbar={                         <navigator.navigationbar routemapper={ navigationbarroutemapper } />                     }                     renderscene={(route, navigator) => {...}}                 />             </view>         );     } }  export default connect(state => state)(app);

since routemapper stateless object , route seems way (best practice) keep state of navigationbar.

route can set this.props.navigator.replace(newroute); in child components. however, re-renderscene , cause dead loop of rerendering child components. want change navigationbar without side effects.

luckily, there's way keep context of current route. this:

var route = this.props.navigator.navigationcontext.currentroute; route.headeritems = {title: "message"}; this.props.navigator.replace(route);

refs:


Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more