look this video of current scrolling behavior. i want, as soon as finger is lifted from screen, to disable scrolling. Edit: the video shows a user scrolling through a list. When the finger is lifted from the screen, you see the scrolling continues up or down for a short time. Answer I think what you need is: …
Tag: react-native
Rendering heavy SVG files (improving performance)
In our company we want to come up with universal solution for creating interactive presentations as mobile applications. First idea was to create a PDF file and use it in mobile phone, it didn’t work out – it was too slow. Another idea was to convert PDF into SVGs and use them as scenes (slides) a…
Detect swipe left in React Native
How can I detect a left swipe on the entire screen in React Native? Would it be necessary to use PanResponder or can it be done a little more easy? Answer There is an existing component react-native-swipe-gestures for handling swipe gestures in up, down, left and right direction, see https://github.com/glepur…
undefined is not an object (evaluating ‘this.props.navigation.navigate’) – React Native
I am trying to make my first React Native Android app and I am getting this error: undefined is not an object (evaluating ‘this.props.navigation.navigate’) This is the code: I can not figure out why the error is coming. Answer You are exporting the component wrong. You should get rid of the export…
How to invert react native vector icon buttons color?
I am using Vector Icons as Icon.Button and I would like to have two Cancel and Accept Icons. I am doing this: I am getting this: I would like this: How to invert react native vector icon buttons color? Thanks Answer Change backgroundColor to transparent, set the color property to the preferred color and bump …
How to change the behaviour of a mocked import?
I am quite confused with mocking in Jest an how to unit test the implementations. The thing is i want to mock different expected behaviours. Is there any way to achieve this? as imports can be only on the top of the file and to be able to mock something it must be declared before the import. I have also
eslint Parsing error: Unexpected token =
Why is eslint throwing this error? The Javascript runs without issue inside of React Native. The code was taken from the react-navigation example at : https://reactnavigation.org/docs/intro/ Javascript: eslint error: .eslintrc.js file: Answer The syntax is not yet standardised, but a stage-2 proposal for incl…
How to Disable back swipe option or pop a route in React Navigation?
I have a Login Page(StackNavigator) and a Tabbed pages(TabNavigator). After logging the user in there is still a possibility for the user to go back(to Login Page) by swiping back. What is the way of popping the login route from the Route Stack or disabling the back swipe option. Thanks Answer Dispatch a rese…
React-Native modules for Android int value returned late?
I have a native Android app that now has a React-Native part to it. In short, i have a list view in native Android/Java. When i tap a row, i start a new Activity which leads to the React-Native code. The components make an API call, but before it does it, my code goes through the React Native module to
How to mock Push notification native module in React native jest tests?
When using the module react-native-push-notification, I had this error: I tried to mock the module by creating __mocks__/react-native.js and putting this code within it: Now, I have this error: How I could mock fully this module the right way? Answer I mocked the module PushNotificationIOS by creating a setup…