问离子4相机/动作表物体(.)不是一个函数

EN

 npm install

$ ionic cordova plugin add cordova-plugin-camera
$ npm install --save @ionic-native/camera

import { Component } from '@angular/core';
import { IonicPage, NavController,ActionSheetController } from 'ionic-angular';
import { Camera, CameraOptions } from '@ionic-native/camera';
import { Storage } from '@ionic/storage';

@IonicPage()
@Component({
  selector: 'page-field-observation',
  templateUrl: 'field-observation.html',
})
export class FieldObservationPage {


 CapturedImageURL:any;


  constructor(
    public navCtrl: NavController, 
    private camera: Camera,
    public actionSheetCtrl: ActionSheetController,
    public storage:Storage
    ){



  }

  ionViewDidLoad() {
   }

captureImage() {
    const CamOptions: CameraOptions = {
      quality: 100,
      destinationType: this.camera.DestinationType.FILE_URI,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE,
      sourceType: this.camera.PictureSourceType.CAMERA,
      targetWidth:1024,
      targetHeight:720
    }

    this.camera.getPicture(CamOptions).then((imageData) => {
      console.log(imageData);
      this.CapturedImageURL = imageData;         
  });

  }

captureImageGallery(){

  const options: CameraOptions = {
              quality: 100,
              destinationType: this.camera.DestinationType.FILE_URI,
              encodingType: this.camera.EncodingType.JPEG,
              mediaType: this.camera.MediaType.PICTURE,
              sourceType:0,
              saveToPhotoAlbum:true,
              targetWidth:1024,
              targetHeight:720,
              allowEdit:true
  }
        this.camera.getPicture(options).then((imageData) => {
          this.CapturedImageURL = imageData; 
        });
}



 CameraActionSheet() {

   let actionSheet = this.actionSheetCtrl.create({
     title: 'Choose an image from',
     enableBackdropDismiss:true,
     buttons: [
       {
         text: 'Camera',
         icon: 'camera',
         handler: () => {
            this.captureImage();
         }
       },
       {
         text: 'Library',
         icon: 'image',
         handler: () => {
           this.captureImageGallery();
         }
       },
       {
         text: 'Cancel',
         role: 'cancel',
         icon:'close-circle',
         handler: () => {
           console.log('Cancel clicked');
         }
       }
     ]
   });

   actionSheet.present();
 }


}