What is the best way to implement flex shrink in react-native, and what are some effective methods for debugging react-native styles overall?

In my RN app styled with native-base, my homepage features a header, a tab view using vreact-native-tab-view that includes a ScrollView occupying 70% of the viewport, and two smaller elements at the bottom each with 100% width.

However, I noticed that the ScrollView extends beyond the viewport causing the smaller elements to be pushed down. When inspecting the elements, I found that applying flexShrink could help, but with so many divs in react-native, it's hard to pinpoint which one needs it. React devtools also present similar challenges in debugging.

I have two questions:

  1. How can I contain the scroll container within its desired dimensions?
  2. What effective methods are there for debugging react native when tools like Chrome and react devtools are not as helpful?

Below are snippets of how I've styled the components:

Home.tsx:

<View flex={1}>
  <TabView
    navigationState={{ index, routes }}
    renderScene={renderScene}
    renderTabBar={renderTabBar}
    onIndexChange={setIndex}
    initialLayout={{ width: layout.width, height: "100%" }}
  />

  <View width="100%">
    <Center width="100%">
      <StrengthSlider />
    </Center>
    <AdMobBanner
      ...props
    />
  </View>
</View>

Teas.tsx:

<View flex={1} bg="white">
  <ScrollCards teas={blackTeas} />
</View>

ScrollCards.tsx:

<ScrollView>
  <Center>
    {teas.length > 0 &&
      teas.map((teaObj) => (
        <TeaCard id={teaObj.id} teaData={teaObj.data} key={teaObj.id} />
      ))}
  </Center>
</ScrollView>

EDIT:

You can find the code sandbox link here. In the sandbox, you'll notice that the admob footer content stays beneath the cards instead of remaining sticky at the bottom of the screen. It seems that using the MainStackNavigator header component affects the behavior of the footer, although this interference with the AppBar component is unclear.

Answer №1

To achieve the desired outcome, it is recommended to include a flexBasis in the TabView as shown below:

<TabView 
  style={{ flexBasis: 0 }}
  // rest of the code
/> 

Explanation: The default styling for the TabView includes flex: 1, overflow: 'hidden' (refer to source code), causing it to expand to match the size of its largest child. By using flexBasis, this behavior can be prevented and ensure the tabview maintains the correct height.

Further Reading: This informative article delves into the differences between flexBasis and width/height:


Debugging styles in React-Native can be challenging. Here are some tips to assist with debugging styling:

  • RN inspector: Utilize the dev menu in React Native to access the "show inspector" option, which functions similarly to "inspect element" in a browser. This tool is helpful in debugging visible elements and input/tab events.

  • Color Coding: Using colored borders and backgrounds can help visualize element placement, size, and overlaps effectively.

  • Simplify & Comment: Consider commenting out irrelevant components and simplifying complex views during debugging. Replace intricate components with simple colored views to isolate specific behaviors for examination.

  • Browser Inspect & React Devtools: If running your RN app in a browser, leverage these tools for efficient debugging. Keep in mind that React and React-Native may have distinct behaviors.

When troubleshooting visual aspects, start from the top layer and gradually work down. Employ color enhancements and comment out elements progressively to pinpoint issues. Delve into package source codes if needed to understand unexpected behaviors more clearly.

Answer №2

If you're looking to make a change, consider swapping out

<View flex={1}> // applied a flex for the entire homepage

in Home.tsx with

<View flex="1 1 0">

An example of this adjustment can be found here (showcasing your code with the modified line).

In terms of debugging, my recommendation aligns with suggestions from the React Native Debugging page. Have you experimented with React Developer Tools yet? Consider adding it as a chrome extension via this link.

I'm uncertain about any disparities between the chrome extension and the npm package, but personally, the extension sufficed (for now).

My sole setback was grappling with debugging on codesandbox, since the extension doesn't function effectively with javascript online editors (and neither does the npm package in this specific scenario)

Answer №3

For a visual representation, you can check out this link.

import React from 'react';
import { View, Image, StyleSheet, ScrollView, Text } from 'react-native';

const styles = StyleSheet.create({
  container: {
    paddingTop: 50,
    flex:1,
    backgroundColor:'aqua',
  },
  tinyLogo: {
    width: 200,
    height: 200,
  },
  header:{
    backgroundColor:'green',
    paddingBottom:20,
  },
  footer:{
    backgroundColor:'green',
    paddingTop:20,
  }
});

const DisplayAnImage = () => {
  return (

    <View style={styles.container}>
      <View style={styles.header}><Text>header</Text></View>
       <ScrollView>
        <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />

              <Image
        style={styles.tinyLogo}
        source={require('@expo/snack-static/react-native-logo.png')}
      />
  
      </ScrollView>
      <View  style={styles.footer}><Text>footer</Text></View>
    </View>

  );
}

export default DisplayAnImage;

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