I have developed a application using react native map. I would like to know does the onRegionChange() method is called by default whenever the onUserLocationChange() is trigger?
After deeper search in the code source, the response is NO.
onRegionChange function called continuously when the region changes, such as when a user is dragging the map.
Related
I am currently attempting to code an app in react native for an android device. I have created a custom loading component and am using the to show a loading icon.
But, I want to use a custom gif loading icon that contains my app's colours. I have looked but I cannot seem to find anything, is it possible to do this?
react native does not support gif feature in its raw form. However, in order to reach what you want and use gifs in the application, you can take a look at the accepted answer on the subject;
How do I display an animated gif in React Native?
Then all you need to do is to use Image component instead of ActivityIndicator. And passing the relevant gif information to the image component.
How do you implement a navigation tracking in real time with mapbox in react-native?
I'm looking into the docs and this polyline looks kinda like it but im not sure. I can display a map with user location from the quick start, but I'm not too sure how to use this component (Fairly new to React-Native).
Thanks!
I am writing a custom component for a Windows 8.1 tablet application our team are mostly developing in React Native.
I've realised that some of the custom code we need doesn't naturally belong to any specific UI element. For example, we want a button to trigger the native Camera UI dialog (as in this CameraUICapture element sample). However, there's no reason this would necessarily be triggered from a button. It could be a callback from something else, it could be a click event on an image. I don't want to lock the function calls to a specific UI piece.
All the tutorials and demos I have managed to find so far for React Custom Components are explicitly for UI pieces, and require implementing a React View manager subclass to interact with React when the piece is loaded. Is this the only way to write native code accessible from a React page? Do I need at least a dummy UI element even to hook into functional code in the native layer, or is there another way?
It turns out the phrase I'm yearning for is "Native Modules".
iOS:
https://facebook.github.io/react-native/docs/native-modules-ios.html
Android:
https://facebook.github.io/react-native/docs/native-modules-android.html
Windows:
https://github.com/Microsoft/react-native-windows/blob/master/docs/NativeModulesWindows.md
I would like to know how to implement a component that has a fixed layout, but frequently updates its display.
Suppose it is an element that needs to be tied to some in app state like a stop watch timer:
(source: mzstatic.com)
If the timer is running then the hundredths of seconds should be ticking on every frame. But in react native my instinct is to make that a <Text>00:12.36</Text> element.
Obviously calling render() is wrong. Is creating a native module the only option for this? Or is there some mechanism to drive frequent display changes within pure js? Are there best practices in this case?
Checkout setNativeProps it allows directly set text (and other properties of elements). Here're docs
You will be able to set text of <Text> component as
this._textInput.setNativeProps({text: '00:12:36'});
Is it possible to use React Native only for one view within the project?
I've successfully added React view for particular iOS app screen (using instructions from "Integration with existing iOS project" docs), but i don't know how to get data from that screen and call other (objective-c) code. For example I want to replace old storyboard-based Search Form to React view and then call storyboard-based screens when user clicks "Search".
Or it is intended to make all views in React and convert existing non-React views into 'native' components (very huge work for big apps)?
This is easily accomplished via the Native Module concept which is described here - https://facebook.github.io/react-native/docs/nativemodulesios.html
You can export obj-c methods to JS via a single call.
I've solved my issue in following way:
Create Native Module wrapper around NSNotificationCenter, so
javascript code could publish iOS events.
Subscribe for that event within ReactController-wrapper around React-Native code.
Raise event when user clicked «Search» (when we need to give control back to objective-c) with needed data to pass as dictionary.
Catch event, process data, open other controllers/etc