renderTitle_10.js

if (Platform.OS === 'ios') {
    let titleOpacity = this.state.scrollY.interpolate({
        inputRange: [0, 41, 48],
        outputRange: [0, 0, 1],
        extrapolate: 'clamp'
    });
    let borderBottomColor = this.state.scrollY.interpolate({
        inputRange: [56, 57],
        outputRange: ["#ffffff", '#f2f2f2'],
        extrapolate: 'clamp'
    });
    return (
        <Animated.View style={[styles.iOSTitleContainer, {
            height: this.headerHeight,
            opacity: titleOpacity,
            borderBottomColor: borderBottomColor
        }]}>
            <Text style={styles.iOSTitle}>
                {title}
            </Text>
        </Animated.View>
    )
}