I have a FlatList, where the items are posts with their images and some texts. I don't want to render all images when the component is mounted. I want only load the images which are already seen. Is there any way to load only viewport images?
I finally found a solution for this. I used onViewableItemsChanged prop of FlatList. The logic is the following: with this prop you can see the items which are seen. You can register them properly (for example I add postSeen: true to each seen posts in the application state). That way you will have all changes under your hand and will be able to use them as needed. Hope this will help someone else.
If you have another solution for this, I will be happy to know. Thanks
Related
I am trying to use pull to refresh from FlatList. Is it possible to move the spinner to where the data actually starts rendering instead of the top of the screen? I found the progressViewOffset that works on Android but I am trying to find how I can implement this behaviour on iOS too. I feel like my solution is to watch scroll interactions and go on from there.
Any idea is appreciated. Thanks in advance.
I was researching this since last year from time to time. I always wonder how Instagram handles the feeds screen?
What kind a component they using for it?
I'm sure it's not a ScrollView becouse it's much more performant than a ScrollView.
It is not also a FlatList becouse I know the basics of the FlatList how it renders the rows etc... and I am sure that they don't use it. For example a FlatList renders the items on top of each other like a card stack. In this behavior you cannot achieve the current Pinch Zoom feature that they have.
I thought maybe they use flipkart's RecyclerListView which is based on Java and much more performant than ScrollView and FlatList, but I am not quite sure about that too.
Any ideas about what they using to achieve current functionality on the feeds screen?
I mean, is there a method or specific listing component to achieve same behavior with all the functions like Double Tap to Like, like Pinch Zoom with overlaying everything.
#Quick note about pinch zooming, it's nearly impossible to build a component with current states of ScrollView and FlatList which will be performant and has same functionality.
You can check out my other topic about that here
Long story short, I have tried a lot of methods and 3rd party components to achieve same thing, but still could not do it.
Thanks for your thoughts!
I am creating a Listview with pagination. If i put the ListView within KeyboardAwareScrollView then onEndReached not called properly. But if i don't put the ListView within any kind of Scrollview it is working perfectly.
My problem is that the content above the ListView is quite big. If i don't put it entire view within any scrollview the bottom content will not be shown.
How to solve this issue?
Thanks in advance.
Sorry I can't put comment because my rep is below 50.
I'm trying to imagine ur situation based on the description because there's no snapshot of ur desired outcome and current outcome. What I understood is this:
If i don't put it entire view within any scrollview the bottom content
will not be shown
This may be just the problem of not putting {flex:1} in the outtermost container view
If i put the ListView within KeyboardAwareScrollView then onEndReached
not called properly
ListView is deprecated as per React Native 0.55 documentation. I don't really understand your scenario, but you might wanna consider just using Scrollview or Flatlist, they might have the solution that ur looking for in a different form. If you are looking for a solution so that your view would avoid keyboard, u could simply use KeyboardAvoidingView from react native instead of using a third party lib, because sometimes they could be restrictive.
All the best! :)
Using the react native's official Modal component
Is there any way to prevent the behavior when the modal is open, if i press the menu button of the mobile (built-in one) the modal flickers and closes temporary exposing the background view. Please see the attached url of the GIF for clarification . I am also not sure whether its a default behavior in react native or not.
https://imgur.com/LeTtNj5
Thanks in advance
This isn't so much a solution as much as it's guidance. You haven't really given enough detail to help you out properly. Best if you can share the code or setup a reduced test case at https://snack.expo.io that we can fiddle with.
That said, I'm not totally sure. This is an interesting problem, and I'm curious if you'll find a possible solution and it may depend on your implementation details. For instance, is the modal part of the navigation stack (react-navigation?) or is it an imported component? Either way, I would begin by playing with componentWillUnmount. Does it get called? If so, perhaps you can insert some black magic there to minimize the effect, but you'd first need to isolate what specifically is going on before you can hope to solve it.
Not sure if this is a huge issue, but I am not completely sure a solution exists to this.
When creating a slideshow style element, where upon tap you image changes to another image (already prefetched using React Native's image prefetcher) there is this white flash when the screen re-renders (I think?).
Has there been a concrete solution to this? I can't figure out how something like say a snapchat story manages to render a new image completely instant
Has anyone ever done this? is the strategy to just load one image on top of another?