import {MentionsTextInput} from 'react-native-mentions';

<MentionsTextInput
 placeholder={'Write a mention...'} // defaults to 'Write a comment...'
 textInputStyle={{ borderColor: '#ebebeb', borderWidth: 1, padding: 5, fontSize: 15 }}
 textInputMinHeight={35}
 textInputMaxHeight={85}
 returnKeyType={'send'}
 trigger={'@'}
 triggerLocation={'new-word-only'} // 'new-word-only', 'anywhere'
 value={this.state.value}
 onChangeText={(val) => { this.setState({ value: val }) } }
 suggestionsPanelHeight={45}
 renderSuggestionsRow={this.renderSuggestionsRow.bind(this)}
 suggestionsPanelStyle={{ backgroundColor: 'rgba(100,100,100,0.1)' }}
 suggestionsDataSource={this.state.ds}
 triggerCallback={this.callback.bind(this)}
 onKeyPress={(e) => { e.nativeEvent.key == "Enter" ? console.log("ENTER") : false } } 
 maxLength={400} // max character length for TextInput
/>