React Native Flickering Issue When position : absolute in iOS only

[cd-ssrivastava]

Description

On Play floating button 2 buttons in row on click, only bottom UI flickers,
I noticed this happens only when position:absolute and bottom:0 .
flickers dont happens if position:absolute and top: deviceHeight // from Dimensions , but using this on some Android Phone the Bottom UI goes beyond screen view,
Android works, only issue with iOS

<View>
<Dialog1 visible=false>
<Dialog2 visible=false>

<View>
 <FlatList> // removed this , still same issue
</View

   <View style={{
                        position: 'absolute',
                        //  bottom: 0,
                        width: '100%',
                        zIndex: 10,
                        height: 150,
                        alignItems: 'flex-end',
                        top: Platform.OS == 'android' ? '80%' : '80%',
                    }}>

                        <TouchableRipple style={styles.floatingButton} onPress={() => startScanning()}>
                            {isScanning ? <Image
                                    source={require("../../../assets/icons/ic_stop_scan.png")}
                                    resizeMode={'contain'}
                                    style={{
                                        height: 80,
                                        alignSelf: 'center',
                                        marginBottom: 0
                                    }}/> :
                                <Image
                                    source={require("../../../assets/icons/ic_start_scan.png")}
                                    resizeMode={'contain'}
                                    style={{
                                        height: 80,
                                        alignSelf: 'center',
                                        marginBottom: 0
                                    }}/>}
                        </TouchableRipple>
                        <View style={{
                            position: 'absolute',
                            width: '100%',
                            bottom: 0,
                        }}>

                            <View style={styles.bottomButtonContainer}>
                                <AppButton text={"Exit & go back"} type={ButtonType.outlined} style={{
                                    flex: 1,
                                    marginHorizontal: 8
                                }} onClick={() => {
                                    navigation.goBack();
                                }}/>
                                <AppButton text={"Ship"}
                                           style={{
                                               flex: 1,
                                               marginHorizontal: 8
                                           }}
                                           onClick={() => {
                                               updateNewOrder();
                                           }}/>
                            </View>
                        </View>


                    </View>

</View>


const styles = StyleSheet.create({
   bottomButtonContainer: {
        flexDirection: 'row',
        width: '100%',
        zIndex: 10,
        //  top: Platform.OS == 'android' ? (deviceHeight * 0.80) : (deviceHeight * 0.80),
        bottom: 0,
        left: 0,
        right: 0,
        paddingBottom: 8,
        paddingTop: 8,
        alignItems: 'flex-end',
        justifyContent: 'space-evenly',
    },

   floatingButton: {
        position: 'absolute',
        // top: Platform.OS == 'android' ? (deviceHeight * 0.70) : (deviceHeight * 0.70),
        // bottom: 80,

        backgroundColor: 'blue',
        width: 60,
        height: 60,
        borderRadius: 30,
        alignSelf: 'center',
        justifyContent: 'center',
        alignItems: 'center',
        elevation: 5, // For Android shadow
        shadowColor: '#000', // For iOS shadow
        shadowOffset: {width: 0, height: 2},
        shadowOpacity: 0.8,
        shadowRadius: 2,
        zIndex: 10,

    },
});

Steps to reproduce

1. Set View at bottom of page, which container 2 button in row and Floating button at center , as per video,
2. On Floating button click state Changes causing flickering
3. I noticed this happens only when position:absolute and bottom:0 .
4. flickers dont happens if position:absolute and top: deviceHeight // from Dimensions , but using this on some Android Phone the Bottom UI goes beyond screen view,

React Native Version

0.76.5

Affected Platforms

Runtime - iOS

Output of npx react-native info

System:
  OS: macOS 14.5
  CPU: (10) arm64 Apple M2 Pro
  Memory: 92.78 MB / 16.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.13.0
    path: /usr/local/bin/node
  Yarn: Not Found
  npm:
    version: 10.9.2
    path: /usr/local/bin/npm
  Watchman:
    version: 2024.12.02.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.2
      - iOS 18.2
      - macOS 15.2
      - tvOS 18.2
      - visionOS 2.2
      - watchOS 11.2
  Android SDK:
    API Levels:
      - "28"
      - "29"
      - "30"
      - "31"
      - "32"
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.3
      - 34.0.0
      - 35.0.0
    System Images:
      - android-34 | Google APIs ARM 64 v8a
      - android-34 | Google Play ARM 64 v8a
      - android-UpsideDownCakePrivacySandbox | Google Play ARM 64 v8a
      - android-UpsideDownCakePrivacySandbox | Google Play Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: 2024.1 AI-241.18034.62.2412.12266719
  Xcode:
    version: 16.2/16C5032a
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 21.0.5
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.1.3
    wanted: 15.1.3
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.5
    wanted: 0.76.5
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

Stacktrace or Logs

No Log errors

Reproducer

Private repo

Screenshots and Videos

20250130_135859.mp4

[react-native-bot]

Tip

Newer version available: You are on a supported minor version, but it looks like there's a newer patch available - 0.76.6. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Please provide either:

• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template
• Otherwise send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.

[react-native-bot]

Tip

Newer version available: You are on a supported minor version, but it looks like there's a newer patch available - undefined. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.