rn 启动页react-native-splash-screen配置

Android版:

1、安装
	yarn  add react-native-splash-screen
	
2、导入
	import SplashScreen from 'react-native-splash-screen'
	
3、设置组件挂载后消失
	componentDidMount(){
	      SplashScreen.hide();
	   }
   
4、android/app/src/main/java/com/newredsj/MainActivity.java 文件中添加如
	
	import android.os.Bundle;
	import org.devio.rn.splashscreen.SplashScreen;

	在类中添加
	
	 @Override
	    protected void onCreate(Bundle savedInstanceState) {
	        SplashScreen.show(this);  // here 
	        super.onCreate(savedInstanceState);
	    }

5、android/app/src/mian/res目录下创建layout文件夹，并在创建的layout文件夹中创建launch_screen.xml
  
	<?xml version="1.0" encoding="utf-8"?>
	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:background="@drawable/launch_screen">
	</LinearLayout>

6、在 android/app/src/mian/res目录下创建drawable-xhdpi文件夹(可创建多个,启动自适应)

    drawable-ldpi		320x240    4:3
    drawable-mdpi		480x320    4:3
    drawable-hdpi		800x480    5:3   854x480    16:9
    drawable-xhdpi		960x540    16:9
    drawable-xxhdpi		1280x720    16:9
    drawable-xxxhdpi	1920x1080    16:9

7、创建drawable-xxx文件夹中放置图片,并重命名为launch_screen.png

8、在android/app/src/main/res/values/styles.xml中添加语句设置背景透明,取消可能存在的一瞬间白屏
  <!--设置透明背景-->
  <item name="android:windowIsTranslucent">true</item>

ios和安卓配置