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import {TextInput} from 'react-native-paper';
<TextInput label="TextInputWithIcon"
left={<TextInput.Icon icon="alert-circle" size={28} color={'red'} />}
/>
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<View style={styles.searchSection}>
<Icon style={styles.searchIcon} name="ios-search" size={20} color="#000"/>
<TextInput
style={styles.input}
placeholder="User Nickname"
onChangeText={(searchString) => {this.setState({searchString})}}
underlineColorAndroid="transparent"
/>
</View>