First and most important: I am by no means a developer. We hired an agency to develop an APP for us, and i was given by a developed solution that i am not convinced if it is the best solution, So i would like to ask you guysfor advice.
Unfortunatelly i cannot put pictures nor links to code for the app, but i will do my best to explain myself:
The problems i encountered are mainly two:
All items appear to have fixed sizes applyed to them: When testing the app on different devices, the size of the elements is not responsive at all. In fact on small devices (Moto G5) There are elements that fall behind the bottom navigation bar making them unaccessible.
Lot of stuff fall below that said bottom navigation bar.
My question is the following:
Is react native responsive?
In web development there is a lot of flexibility when it comes to responsiveness with CSS and JS. Is React native any different? or there is a way to prepare the layout so it fits most of the common sizes without losing acces to interactions?
Hope i explained myself correctly. and again, sorry for not asking a technical specific question.
React Native is designed to be responsive, but it requires a different approach compared to web development. In web development, you can use CSS and JavaScript to make your website responsive, but in React Native, you use a different set of tools.
We have many ways to make the app responsive with the device's large screen and small screen.
Use the Dimensions API: React Native provides the Dimensions API, which allows you to get the dimensions of the screen at runtime. You can use this information to adjust the layout of your app based on the size of the screen.
Use third-party libraries ex: react-native-size-matters, react-native-responsive-screen, ...
Use Flexbox: React Native uses Flexbox for layout, just like web development. Flexbox is a powerful tool for creating responsive layouts that adapt to different screen sizes. You can use the flex property to adjust the size and position of elements on the screen.
In terms of your specific issue with elements falling behind the bottom navigation bar, it's likely that the layout is not taking the height of the navigation bar into account. You can use the Dimensions API to get the height of the navigation bar and adjust the layout accordingly.
Related
I am very new to programming and I am currently using react native to make android applications. Now I am just testing out my code in my own physical smartphone. I want to know if it is more apt to use '%' unit in dimensions to properly scale apps in different phone sizes.
It depends upon your UI like how your UI is look like, But general approach is use react native default view property like flex, flexbox which have different property as per your UI so it will scale your UI in any point upto 99% of devices. Some of devices may very depend on resolution and screen height so for that you can use % in width and height but remember only specific condition not every where .
General View style you can refer this
https://reactnative.dev/docs/layout-props
https://reactnative.dev/docs/image-style-props
https://reactnative.dev/docs/shadow-props
https://reactnative.dev/docs/text-style-props
https://reactnative.dev/docs/view-style-props
For simple login screen UI you can refer this example so you can get idea how react native UI we can create generalize
https://code.tutsplus.com/tutorials/common-react-native-app-layouts-login-page--cms-27639
I need to display dozens of fairly complex SVGs on screen, on a React native chat app.
Each SVG represents an avatar with 3 shades, whose color I change through code to fit the user's preferences.
Because I am changing colors dynamically, I am currently displaying the SVGs as components in a Webview.
This works fine, but when I have a dozen of those on-screen (for example inside a busy chat room), I am having some serious performance issues.
What would be a good approach to keep both my colorized SVGs AND performance?
Using react-native-svg's SvgCss improved perfomance tremendously.
I want to display several components (maybe up to 6) in my React Native app that continuously change their position, i.e. slowly but fluently float on the screen and change their moving direction randomly or based on an angle at which they approach the edge of their parent, if they do. What I don't know is how to change their position dynamically in a performance friendly way. Because I also want to let the user interact with them by tapping on them, it cannot be a video in a background or something similar.
If I were dealing with a standard React app running in a browser, I think I would simply manipulate the element's style attributes top and left. Since I want to implement this in React Native, I think there must be a solution that is way more performant and elegant, involving manipulation of the native elements that back the React Native views or using some animation mechanism, because re-rendering a view with like 6 components at least 30 times per second doesn't seem like an appropriate solution and an overhead in general.
Googling things like "react native dynamically move element" or "react native dynamically change element position" did not bring any obviously appropriate results. I came across a native element method setNativeProps, though, but couldn't find any information on what props I could set to change the element's position on the screen and how performant that would be. I also looked into React Native's Animated API, but could not quite relate my problem to the solutions that this API offers from a first glance.
Does anyone know a mechanism or maybe a library that would be appropriate to use in the situation that I described?
I want to render a three-dimensional cube with images on its six surfaces in React Native, that can be rotated by the user. First, I wanted to use react-native-canvas, but 3D rendering isn't possible within such a canvas.
My second idea was a Web View, that is shown in React Native and that renders the cube. The big disadvantage of this solution is, that a internet connection is necessary. Furthermore, maybe the performance isn't that good this way.
So, do you have any idea how to solve my problem? Thanks for all responds.
I would recommend you use a javascript framework called three.js. it is designed to do exactly what you are looking for.
If i make my application screen on nexus4 emulator screen and wanted to see it on small screen phones, would it be necessary to use scrollview instead of View in react-native.
In some cases yes, because scaling everything according to the screen size will make the app elements look extremely tiny on some devices and text will be hard to read. I had a similar issue where I scaled every screen according to the device resolution and customers complained about not being able to read on small devices.
What I did was wrap such screens in a ScrollView, then put a View inside it with a minHeight: screenHeight then put elements with flexbox and fixed size inside it. This way it would fit most screens perfectly and on smaller ones it would still look good enough. You should experiment a little to see what works best for your app.