screenOrientatiton 不起作用（我删除了已安装的插件，然后安装了最新版本）

Question

我删除了已安装的插件，然后我安装了最新版本，但它不起作用，手机也进入横向模式，这是我不想要的。 谢谢你

ionic cordova plugin remove cordova-plugin-screen-orientation
ionic cordova plugin add cordova-plugin-screen-orientation@latest
npm install @ionic-native/screen-orientation@latest

离子 CLI：6.10.0 离子框架：@ionic/angular 6.0.4

app.module.ts:

import { ScreenOrientation } from '@ionic-native/screen-orientation/ngx';
...
 providers: [
    ScreenOrientation,
....

app.components.ts:

import { SplashScreen } from '@ionic-native/splash-screen/ngx';
...
constructor(
    private screenOrientation: ScreenOrientation,
....)
{
    this.initializeApp();
}

  initializeApp() {
    this.platform.ready().then(() => {
      this.splashScreen.hide();
      this.statusBar.styleDefault();
this.screenOrientation.lock(this.screenOrientation.ORIENTATIONS.PORTRAIT);
//this.screenOrientation.lock(this.screenOrientation.ORIENTATIONS.PORTRAIT_PRIMARY);
      this.screenOrientation.onChange().subscribe(
        () => {
            alert("Orientation Changed: "+ this.screenOrientation.type);
        }
      ); // not detected by alert
    
        });