react-native-fast-ui

A small StyleSheet framework to build your views in record time.

Installation

npm install --save react-native-fast-ui

or

yarn add react-native-fast-ui

Why use react-native-fast-ui?

with StyleSheet

<View style={{ width:300, height:500 }}>
  <Text style={{ fontSize:40 }}>hello</Text>
</View>

with react-native-fast-ui

import { styles as dm } from 'react-native-fast-ui'
 
<View style={{ ...dm.w_300, ...dm.h_500 }}>
  <Text style={{ ...dm.f_40 }}>hello</Text>
</View>

without react-native-fast-ui

import { Platform , ... } from "react-native";
 
 <Text style={{
   color:'#000000',
   fontSize:40,
   marginVertical:10
  }}>
    Welcome to React Native on { Platform.OS==='Android' ? "Android" : "iOS" }
</Text>

with react-native-fast-ui

import { styles as dm, IS_ANDROID } from 'react-native-fast-ui'
 
 <Text style={{ ...dm.c_black, ...dm.f_25, ...dm.ma_ver_10 }}>
    Welcome to React Native on { IS_ANDROID ? "Android" : "iOS" }
</Text>

Preview

iPhone X	iPad Pro

Example

import React, { Component } from "react";
import {
  Text,
  View,
  Image,
  TouchableOpacity
} from "react-native";
import {
  styles as dm,
  IS_ANDROID,
  SCREEN_HEIGHT,
  WINDOW_HEIGHT,
  SCREEN_WIDTH,
  STATUSBAR_HEIGHT,
  DIAGONAL_SCREEN
} from "react-native-fast-ui";
 
//icons dimentions, calculate this values outside the render method to improve the performance
const ICON_SIZE = DIAGONAL_SCREEN * 0.3;
const ICON_RADIUS = ICON_SIZE / 2;
 
export default class App extends Component<{}> {
  render() {
    return (
      <View style={{ ...dm.flex_1, ...dm.b_white, paddingTop: STATUSBAR_HEIGHT }}>
        <View
          style={{
            backgroundColor: "#d2d2d2",
            width: SCREEN_WIDTH,
            height: WINDOW_HEIGHT,
            ...dm.center
          }}
        >
          <Image
            style={{
              width: ICON_SIZE,
              height: ICON_SIZE,
              backgroundColor: "#999",
              borderRadius: ICON_RADIUS
            }}
            resizeMode="contain"
            source={require("./images/logo.png")}
          />
          {/* START Text with black color, responsive font 25 , and verticals margins 10 */}
          <Text style={{ ...dm.c_black, ...dm.f_25, ...dm.ma_ver_10 }}>
            Welcome to React Native on {IS_ANDROID ? "Android" : "iOS"}
          </Text>
          {/* END Text with black color, responsive font 25 , and verticals margins 10 */}
          <Text style={{ ...dm.c_black }}>
            The StatusBar Height is {STATUSBAR_HEIGHT}
          </Text>
          <Text style={{ ...dm.c_black }}>
            The window Height is {WINDOW_HEIGHT}
          </Text>
          <Text style={{ ...dm.c_black }}>
            The Device Height is {SCREEN_HEIGHT}
          </Text>
 
          {/* create a Toolbar with absolute position, height 55, flexDirection row, alignItems: "center", justifyContent: "space-between" */}
          <View
            style={{
              ...dm.p_a,
              ...dm.top_0,
              ...dm.left_0,
              ...dm.right_0,
              ...dm.h_55,
              ...dm.flex_r,
              ...dm.ai_c,
              ...dm.jc_sb,
              backgroundColor: "#999"
            }}
          >
            {/* Button width:55, height:55, alignItems: "center", justifyContent: "center" */}
            <TouchableOpacity style={{ ...dm.w_55, ...dm.h_55, ...dm.center }}>
              <Image
                style={{ ...dm.w_35, ...dm.h_35, tintColor: "#fff" }}
                resizeMode="contain"
                source={require("./icons/menu.png")}
              />
            </TouchableOpacity>
 
            {/* Text color white, responsive font 30 */}
            <Text style={{ ...dm.c_white, ...dm.f_30 }}>APP NAME</Text>
 
            {/* Button width:55, height:55, alignItems: "center", justifyContent: "center" */}
            <TouchableOpacity style={{ ...dm.w_55, ...dm.h_55, ...dm.center }}>
              <Image
                style={{ ...dm.w_35, ...dm.h_35, tintColor: "#fff" }}
                resizeMode="contain"
                source={require("./icons/notification.png")}
              />
              {/* Red badge with absolute position, left:0, top:0, alignItems: "center", justifyContent: "center", width:15, height:15 */}
              <View
                style={{
                  ...dm.p_a,
                  ...dm.top_5,
                  ...dm.left_0,
                  ...dm.center,
                  ...dm.w_15,
                  ...dm.h_15,
                  borderRadius: 7.5,
                  backgroundColor: "#f00"
                }}
              >
                <Text style={{ ...dm.c_white, ...dm.f_14 }}>2</Text>
              </View>
            </TouchableOpacity>
          </View>
        </View>
      </View>
    );
  }
}

Documentation

Constants

name	type	description
IS_ANDROID	bool	is true if the OS is Android
IS_IPHONE_X	bool	is true if the device is an iPhone X
STATUSBAR_HEIGHT	number	gets the statusBar height on iOS and Android
SCREEN_WIDTH	number	gets the screen width
SCREEN_HEIGHT	number	gets the screen height
WINDOW_HEIGHT	number	on Android and iOS (no iPhone X) returns the window height removed the statusbar height. On iPhone X returns the height of the SafeAreaView
DIAGONAL_SCREEN	number	value for the diagonal screen usefull to create responsive contents

Methods

name	return	notes
WP(percent: number)	number	gets the a percent of the screen width
HP(percent: number)	number	gets the a percent of the screen height

Responsive FontSize

The minimum value for the responsive fontSize is 5 and the maximum value is 100.

First import the styles, now you can define a fontSize like this

import { styles as dm } from 'react-native-fast-ui'
 
 
/// in your render method
<Text style={{ ...dm.f_30, color:'#000' }}>Responsive fontSize 20</Text>
 
<Text style={{ ...dm.f_100, color:'#000' }}>Responsive fontSize 100</Text>
 
/*
you can use
dm.f_5
dm.f_6,
dm.f_7,
.
.
.
dm.f_100
*/

alignItems

center: {
    alignItems: "center",
    justifyContent: "center"
},
ai_c: { alignItems: "center" }
ai_fs: { alignItems: "flex-start" }
ai_fe: { alignItems: "flex-end" }
ai_st: { alignItems: "stretch" } 
ai_b: { alignItems: "baseline" }

First import the styles, now you can define the alignItems like this

import { styles as dm } from 'react-native-fast-ui'
.
.
.
{/* creates a text center vertical and horizontal inside a view container with width:400, height:400*/}
<View style={{ ...dm.center, ...dm.w_400, ...dm.h_400 }}>
  <Text style={{ ...dm.f_30 }}>Responsive fontSize 20</Text>
</View>