import React, { useState } from "react";

import { Text, View, StyleSheet, Slider } from "react-native";

function ShadowPropSlider({ label, value, ...props }) {

return (

<>

<Text>

{label} ({value.toFixed(2)})

</Text>

<Slider step={1} value={value} {...props} />

</>

);

}

export default function App() {

const [shadowOffsetWidth, setShadowOffsetWidth] = useState(0);

const [shadowOffsetHeight, setShadowOffsetHeight] = useState(0);

const [shadowRadius, setShadowRadius] = useState(0);

const [shadowOpacity, setShadowOpacity] = useState(0.1);

return (

<View style={styles.container}>

<View

style={[

styles.square,

{

shadowOffset: {

width: shadowOffsetWidth,

height: -shadowOffsetHeight

},

shadowOpacity,

shadowRadius

}

]}

/>

<View style={styles.controls}>

<ShadowPropSlider

label="shadowOffset - X"

minimumValue={-50}

maximumValue={50}

value={shadowOffsetWidth}

onValueChange={val => setShadowOffsetWidth(val)}

/>

<ShadowPropSlider

label="shadowOffset - Y"

minimumValue={-50}

maximumValue={50}

value={shadowOffsetHeight}

onValueChange={val => setShadowOffsetHeight(val)}

/>

<ShadowPropSlider

label="shadowRadius"

minimumValue={0}

maximumValue={100}

value={shadowRadius}

onValueChange={val => setShadowRadius(val)}

/>

<ShadowPropSlider

label="shadowOpacity"

minimumValue={0}

maximumValue={1}

step={0.05}

value={shadowOpacity}

onValueChange={val => setShadowOpacity(val)}

/>

</View>

</View>

);

}

const styles = StyleSheet.create({

container: {

flex: 1,

justifyContent: "space-around",

backgroundColor: "#ecf0f1",

padding: 8

},

square: {

alignSelf: "center",

backgroundColor: "white",

borderRadius: 4,

height: 150,

shadowColor: "black",

width: 150

},

controls: {

paddingHorizontal: 12

}

});

Reference

These properties are iOS only - for similar functionality on Android, use the elevation property.

Props

shadowColor

Sets the drop shadow color

Type	Required	Platform
color	No	iOS

---

shadowOffset

Sets the drop shadow offset

Type	Required	Platform
object: {width: number,height: number}	No	iOS

---

shadowOpacity

Sets the drop shadow opacity (multiplied by the color's alpha component)

Type	Required	Platform
number	No	iOS

---

shadowRadius

Sets the drop shadow blur radius

Type	Required	Platform
number	No	iOS