I have a picker in my react-native ios app and want to set the height but the example won't honor flex, a style height or a height attribute.
<Picker
style={[styles.testbox, {borderColor: '#00F', flex:1, height: 100}]}
selectedValue={this.state.language}
height={100}
onValueChange={(itemValue, itemIndex) => this.setState({language: itemValue})}>
<Picker.Item label="Java" value="java" />
<Picker.Item label="JavaScript" value="js" />
</Picker>
There's no height
prop per the docs, so you can remove that.
From playing around with the styling, it looks like the most important part is to set the itemStyle
prop and define the height
value there. You'll probably also want to style the Picker
component itself and set the height
value to be the same for the best looking results, but you don't need to do that.
Minimal Example:
<Picker style={{width: 200, height: 44}} itemStyle={{height: 44}}>
<Picker.Item label="Java" value="java" />
<Picker.Item label="JavaScript" value="js" />
</Picker>
Here's a Snack showing a full example for varying heights (code copy pasted below):
import React, { Component } from 'react';
import { Text, View, StyleSheet, Picker } from 'react-native';
export default class App extends Component {
constructor(props) {
super(props)
this.state = {
language: 'haxe',
firstLanguage: 'java',
secondLanguage: 'js',
}
}
render() {
return (
<View style={styles.container}>
<Text style={styles.title}>Unstyled:</Text>
<Picker
style={[styles.picker]} itemStyle={styles.pickerItem}
selectedValue={this.state.language}
onValueChange={(itemValue) => this.setState({language: itemValue})}
>
<Picker.Item label="Java" value="java" />
<Picker.Item label="JavaScript" value="js" />
<Picker.Item label="Python" value="python" />
<Picker.Item label="Haxe" value="haxe" />
</Picker>
<Text style={styles.title}>Shows one row:</Text>
<Picker
style={[styles.onePicker]} itemStyle={styles.onePickerItem}
selectedValue={this.state.firstLanguage}
onValueChange={(itemValue) => this.setState({firstLanguage: itemValue})}
>
<Picker.Item label="Java" value="java" />
<Picker.Item label="JavaScript" value="js" />
<Picker.Item label="Python" value="python" />
<Picker.Item label="Haxe" value="haxe" />
</Picker>
<Text style={styles.title}>Shows above and below values:</Text>
<Picker
style={[styles.twoPickers]} itemStyle={styles.twoPickerItems}
selectedValue={this.state.secondLanguage}
onValueChange={(itemValue) => this.setState({secondLanguage: itemValue})}
>
<Picker.Item label="Java" value="java" />
<Picker.Item label="JavaScript" value="js" />
<Picker.Item label="Python" value="python" />
<Picker.Item label="Haxe" value="haxe" />
</Picker>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: 'column',
alignItems: 'center',
padding: 20,
backgroundColor: 'white',
},
title: {
fontSize: 18,
fontWeight: 'bold',
marginTop: 20,
marginBottom: 10,
},
picker: {
width: 200,
backgroundColor: '#FFF0E0',
borderColor: 'black',
borderWidth: 1,
},
pickerItem: {
color: 'red'
},
onePicker: {
width: 200,
height: 44,
backgroundColor: '#FFF0E0',
borderColor: 'black',
borderWidth: 1,
},
onePickerItem: {
height: 44,
color: 'red'
},
twoPickers: {
width: 200,
height: 88,
backgroundColor: '#FFF0E0',
borderColor: 'black',
borderWidth: 1,
},
twoPickerItems: {
height: 88,
color: 'red'
},
});