Created
June 15, 2017 19:17
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Why do inline styles outperform Stylesheet.create() ?
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import React, { Component } from 'react'; | |
import { | |
AppRegistry, | |
StyleSheet, | |
Text, | |
View | |
} from 'react-native'; | |
steps = 20000; | |
const IS_INLINE = 0; | |
inlineStyles = () => { | |
const texts = []; | |
for (var i = 0; i < steps; i++) { | |
texts.push(<View key={`tx_${i}`} style={{ borderRadius: 15, padding: 3, backgroundColor: "red", width: 5, height: 5 }}></View> ) | |
} | |
return texts; | |
} | |
stylesheetStyles = () => { | |
const texts = []; | |
for (var i = 0; i < steps; i++) { | |
texts.push(<View key={`tx_${i}`} style={styles.styleContainer}></View>) | |
} | |
return texts; | |
} | |
export default class managing_styles extends Component { | |
constructor(props) { | |
super(props); | |
if (IS_INLINE) { | |
this.texts = inlineStyles(); | |
} else { | |
this.texts = stylesheetStyles(); | |
} | |
this.t = Date.now() | |
} | |
render() { | |
return ( | |
<View style={styles.container}> | |
<View style={styles.wrap}> | |
{ this.texts } | |
</View> | |
<Text style={styles.instructions}> | |
{ Date.now() - this.t } | |
</Text> | |
</View> | |
); | |
} | |
} | |
const styles = StyleSheet.create({ | |
container: { | |
flex: 1, | |
justifyContent: 'center', | |
alignItems: 'center', | |
backgroundColor: '#F5FCFF', | |
}, | |
welcome: { | |
fontSize: 20, | |
textAlign: 'center', | |
margin: 10, | |
}, | |
styleContainer: { | |
height: 5, | |
borderRadius: 15, | |
padding: 3, | |
width: 5, | |
backgroundColor: "blue", | |
}, | |
wrap: { | |
padding: 20, | |
flex: 1, | |
flexDirection: "row", | |
flexWrap: "wrap", | |
}, | |
instructions: { | |
textAlign: 'center', | |
color: '#333333', | |
marginBottom: 5, | |
}, | |
}); | |
AppRegistry.registerComponent('managing_styles', () => managing_styles); |
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The docs state calling
Stylesheet.create()
should outperform inline declaration: https://facebook.github.io/react-native/docs/stylesheet.html