A StyleSheet is an abstraction similar to CSS StyleSheets

Create a new StyleSheet:

var styles = StyleSheet.create({
  container: {
    borderRadius: 4,
    borderWidth: 0.5,
    borderColor: '#d6d7da',
  },
  title: {
    fontSize: 19,
    fontWeight: 'bold',
  },
  activeTitle: {
    color: 'red',
  },
});

Use a StyleSheet:

<View style={styles.container}>
  <Text style={[styles.title, this.props.isActive && styles.activeTitle]} />
</View>

Code quality:

By moving styles away from the render function, you're making the code easier to understand.
Naming the styles is a good way to add meaning to the low level components in the render function.

Performance:

Making a stylesheet from a style object makes it possible to refer to it by ID instead of creating a new style object every time.
It also allows to send the style only once through the bridge. All subsequent uses are going to refer an id (not implemented yet).

Methods #

static create(obj: {[key: string]: any}) #

Creates a StyleSheet style reference from the given object.

Properties #

hairlineWidth: CallExpression #

This is defined as the width of a thin line on the platform. It can be used as the thickness of a border or division between two elements. Example:

  {
    borderBottomColor: '#bbb',
    borderBottomWidth: StyleSheet.hairlineWidth
  }

This constant will always be a round number of pixels (so a line defined by it look crisp) and will try to match the standard width of a thin line on the underlying platform. However, you should not rely on it being a constant size, because on different platforms and screen densities its value may be calculated differently.

StyleSheet #

Methods #

static create(obj: {[key: string]: any}) #

Properties #

hairlineWidth: CallExpression #

flatten: CallExpression #