message: Rendered blank image if primary
  Matches android (I think)
diff: @@ -51,7 +51,7 @@ class TabBar extends React.Component<any, any> {
  return (
  <TouchableHighlight key={i} href={href} onPress={(e) => this.changeTab(i, e)} style={{flex: 1}}>
  <View style={{alignItems: 'center', height, backgroundColor: barTintColor, paddingTop, borderBottomWidth: highlight ? 2 : 0, borderBottomColor: highlight ? color : undefined}}>
  - {image && (
  + {(primary || !titleOrImageOnly || image) && (
  <Image source={image} accessibilityLabel={title} style={{width: 24, height: 24, tintColor: color}} />
  )}
  {title && (
  