![]() Once the TabBar is pinned, a bottom border should be faded in to add depth to TabViews sliding beneath it.Unlike with Header, we need to cap the total distance the component can travel up the screen, to give the effect that the tabs are pinned beneath the NavBar. Similar to the Header, the TabBar must be slid up the screen using translateY. The TabBar should slide up and then pin to the bottom edge of the NavBar.This transform gives the visual appearance of the Header scrolling with the TabBar and TabViews up and off the page, without actually scrolling the page (more on managing scroll position, and the complexity that comes with that in the implementation details below). Because the top-level Screen container cannot be scrollable, we must simulate the effect that the top of the page is “scrolling” by interpolating the active TabView’s scroll position to a translateY offset for the Header. Because TabViews must be independently scrollable (with their own independent scroll positions), the top-level Screen container cannot be scrollable. One important limitation of React Native is that there are no nested scroll surfaces. This might seem obvious, but getting this right on React Native can be quite challenging. The Header should slide up and off the screen (beneath the NavBar) on scroll.The ideal trigger point for this animation is right as the Header title is obstructed by the NavBar. We first noticed this behavior when analyzing Apple Note’s UI, but you’ll see in all of Apple’s native applications (Apple Music, Mail, etc.) that they implement this same fade trigger point. While this works really well when scrolling slowly, if you scroll more quickly (standard in day-to-day use of applications) you’ll notice the NavBar title will often transition in too abruptly. Many people make the mistake of interpolating the NavBar title opacity based on the page’s scroll position. The NavBar should fade in/out with a timer based animation when the scroll reaches a certain position. ![]() Study the gif above to see if you can pick out each of these subtle behaviors. Here is a list of key interactions (all of which you will find in our sample project on github). Many of these behaviors were identified through studying external implementations like Twitter and Instagram, as well as platform specific applications and specifications like Apple’s HIG and Google’s Material Design. ![]() There are a handful of key interactions that go into making the TabView look and feel organic.
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