React Native Animation Zoom
When creating a scroll view for a mobile app, a common principle could be to have an image on the very top of the list. This could be to showcase the content of the page. Examples for this could be found in the Spotify app, where an album cover is shown first, followed by a list of its songs.
Scrolling up a list of items with an image on top, it can be a nice feature to zoom in the picture naturally. I describe how this can be easily done in React Native. In one of my current React Native apps, which is [open source] with full End-To-End and CI/CD setup, I have implemented this feature. The source code / component can be found on Github.
. This allows us to have content in a scrollable container. When hitting the end of the scroll container in one direction, you may see a bounce of the content. This can be manipulated by changing the boolean
React Native Image Viewer/readme.md At Master · Ascoders/react Native Image Viewer · Github
To 1. However, this could cause performance problems, since more data is sent (over the bridge - serialized and sent to the JavaScript environment).
The image is the first item in the scroll view. In order to change its size dynamically, the view must be animated. You could either do this by using
Prop. The idea is, that the scale increases to a certain value (20 in this example) in relation to a negative change of the
How To Use Zoom Component In Reactjs ?
Value. This means that the more negative (scrolling up, or over the top edge) the value gets, the more we increase the image's scale.
Now, you may notice an empty space on top of the image, the further you scrolled up. You might not want this, so what you could do is change the
Value. This should keep the image on top of the scroll view's container. You may need to play with the values a bit, since they can be different in your app.
Build A Map With Custom Animated Markers And Region Focus When Content Is Scrolled In React Native
Lastly, the content below the image may be a bit off when scrolling or zooming. If you don't want this, you could wrap these views in an
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Typed Config via Context in React Native # react # reactnative # javascript # typescript Animated Book Star Rating in React Native # react # reactnative # javascript # typescript Horizontal Card Carousel in React Native # react # reactnative # javascript # typescriptThe open-source library react-native-gesture-handler is a great way to add gestures to cross-platform React Native apps. Two of the main reasons I find this useful because it uses native support to handle gestures and the other reason being it is better at performing on each native platform than React Native's built-in touch system Gesture Responder system.
Animating Map Region With Animated Api
In this tutorial, let us explore this library by creating a small demo that allows the user to use their two fingers to pinch in to zoom a media content. For the media content, I am going to use a placeholder image. This pinch gesture is achievable by using
From the library. This handler tracks the distance between two fingers and uses that information to scale or zoom on the content. It gets activated when the fingers are placed on the screen and when their position changes.
Statement. This event is going to be an Animated event. This way gestures can directly map to animated values. The animated value to be used here is
Animate Your React Native App
That handles the state change when the gesture is over. Each gesture handler has is assigned a state that changes when a new touch event occurs.
Is used to check whether the event is still active or not. To access these states, the object is required to import from the library itself.
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Animated Image Component In React Native
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