A guide on implementing fadein fadeout animations in React Native using z-index

I am currently working on animating a message to always appear at the top of the screen even when scrolling. The animation triggers perfectly when clicking on onButtonClick from my FlatList component. However, I have encountered a small issue where the Animated.View is positioned absolutely at the top of the screen, causing the topmost element of the Flatlist to be unclickable. I attempted to adjust the zIndex but it didn't seem to have any effect. How can I resolve this clickability issue while maintaining the current animation functionality?

//styles
 notification: {
    position: 'absolute',
    top: 50,
    alignSelf: 'center',
    zIndex: 100
  },
  notificationWrapper: {
    height: 100,
    width: 270,
    backgroundColor: 'rgba(255,255,255,1)',
    borderRadius: 10,
    marginTop: 40,
    marginBottom: 40,
    marginLeft: 28,
    marginRight: 28,
    flexDirection: 'row',
    alignItems: 'center',
    paddingLeft: 28
  }
//js

onButtonClick = () => {
    this.fadeIn.setValue(0);
    Animated.timing(
      this.fadeIn,           
      {
        toValue: 1,
        duration: 1000,
      }
    ).start(() => {
      setTimeout(() => {
        this.fadeOut();
      }, 2000);
    });
}

fadeOut = () => {
    this.fadeIn.setValue(1);
    Animated.timing(
       this.fadeIn,
       {
         toValue: 0,
         duration: 1000,
       }
    ).start();
}
<Fragment>
  <ScrollView style={[styles.mainContainer, {flex: 1}]}>
   <FlatList
     style={{ paddingTop: 10, paddingLeft: 20, paddingRight: 20 }}
     data={favouriteData}
     keyExtractor={this.keyExtractor}
     renderItem={this.rendeCampus}
   />
 </ScrollView>
   <Animated.View                 
     style={[styles.notification, {opacity: this.fadeIn, zIndex: 
          this.fadeIn}]}
    >
      <View style={styles.notificationWrapper}>
        <Text style={{
          fontSize: 12,
          lineHeight: 15,
          color: 'rgba(42,36,66,1)',
          width: 270
        }}>This restaurant has been added to your favourites list</Text>
      </View>
   </Animated.View>
</Fragment>

Answer №1

It seems like all other settings are set to the default value of zIndex: 0

To create a more dynamic effect, consider using interpolation in this way:

this.zAnimate = this.fadeIn.interpolate({
  inputRange: [0, 1],
  outputRange: [-1, 9]
})

Then, link this.zAnimate to your zIndex. You may need to adjust the outputRange values based on when you want the element to fade behind or come in front.

Answer №2

To adjust the positioning of the element, consider implementing the transform property. Here is an example:

this.fadeIn.setValue(1);
    Animated.timing(
       this.fadeIn,
       {
         toValue: 0,
         duration: 1000,
       }
    ).start(() => {
      this.transform.setValue(-200);
    });

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