12/30/2023 0 Comments Table swipe delete flickery swiftWe have to be especially careful when using this prop because it is not available on Android for performance reasons It’s often used together with layoutMeasurement and contentOffset - for example, to determine whether the user has scrolled to the end of the content. contentSize – We use this prop to get the height and width of the content inside the ScrollView.If it’s a horizontal ScrollView component, we’re using contentOffset.x if it’s vertical, we’re using contentOffset.y contentOffset – This value is the distance that the user has already scrolled from the beginning, most often used when we want to track the scrolled value.A single scroll event is an object that looks like this: This event fires maximally once per frame during scrolling. To do so correctly, we should use onScroll props. When working with ScrollView, we often need to track the scroll position. So now that we know when to use ScrollView and how to style it, I’ll explain some of the common props that may cause some confusion and lead to bugs. It’s the moving part of the ScrollView, and this is where we’re applying styles that allow us to align the items inside, add padding, etc. The contentContainerStyle prop is a scrollable container inside the parent ScrollView I described above.This parent container cannot exceed viewport’s height or width We’re setting the size of the ScrollView element on the window viewport and its relative position to sibling elements. The style prop is used for the styling of the ScrollView parent element, which we can think of as a simple, non-scrollable View.Here’s a short explanation of those props: Beginners often waste a lot of time figuring out how to properly style the ScrollView because it has two styling props: style and contentContainerStyle. Now that we know when to use the ScrollView component, let’s take a look at how to use it. I hope by reading the paragraph above I helped you understand when to use which component. There are a few more great tips on how to improve FlatList performance, which have been very well explained in the docs here. Setting this number too low may cause blank areas The best practice is to define the precise amount of items that would cover the viewport for every device, which could be a performance boost for the initial rendering of the component. initialNumToRender – This is the initial amount of items to be rendered into the FlatList.removeClippedSubviews – A Boolean that, when enabled (it’s false by default), detaches views that are outside the viewport from the native view hierarchy, which reduces time spent on the main thread, leading to reduced risk of dropped frames.Because FlatList only renders elements that are currently showing on the screen - not all the elements at once - it is capable of displaying long lists in a more performant way.įlatList exposes to us a long list of props that are designed for the best UX and performance of rendering long data lists, including: Whenever you’re fetching data from an API in the form of lists, for example, the best way to display them in your app would be with the FlatList component, which is implemented differently. This is why if you have a lot of elements inside your ScrollView and some of them are, for example, taller, portrait-style pictures, ScrollView’s performance may be a bit laggy and unpleasant for the user. To determine which one to use, we only have to remember one thing: ScrollView works best to display a small amount of elements with a limited size because all of ScrollView’s children components are rendered at once - even if they’re not currently visible on-screen. There are two common List components in React Native: ScrollView and FlatList. The first and most common mistake of using ScrollView is not knowing when to use it. Today, I’ll explain some common mistakes when using ScrollView in React Native and how to avoid them, plus a few tips and tricks to help provide the best user experience possible. We can see scrolled components in almost every app available on the App Store and Google Play. After putting all those elements inside the ScrollView component, you can use it to scroll through them vertically (the default) or horizontally (by adding it as a prop). React Native’s ScrollView component is a generic container that can contain multiple elements - Views, Texts, Pressables, and even another ScrollView. Follow me on Instagram Common bugs in React Native ScrollView and how to fix them Paweł Karniej Follow Self-made developer specializing in building React Native apps.
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