离子发球后,无法解析[object OBJECT]的所有参数

Question

我不知道我做错了什么,但是在尝试使用离子和Cordova插件时,我在离子发送后收到以下错误:"无法解析[object OBJECT],[object OBJECT],[object OBJECT]的所有参数, [object OBJECT],[object OBJECT],？"

import { Component, Injectable } from '@angular/core';
import { NavController } from 'ionic-angular';
import { ToastController } from 'ionic-angular';
import { File } from '@ionic-native/file';
import { Diagnostic } from '@ionic-native/diagnostic';
import { CameraPreview, CameraPreviewOptions, CameraPreviewDimensions} from '@ionic-native/camera-preview';
declare var cordova: any;

@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  providers: [CameraPreview, Diagnostic]
})
export class HomePage {

  constructor(
    public navCtrl: NavController,
    public toastCtrl: ToastController,
    public file:File,
    public diagnostic:Diagnostic,
    public cameraPreview: CameraPreview,
    public previewRect: CameraPreviewOptions
    ) {
    this.checkPermissions();
  }

Answer 1

我在某个地方遇到了同样的问题，因此我删除了构造函数的最后一个参数，并在构造函数之前给了它。在这种情况下

export class HomePage {

 public previewRect: CameraPreviewOptions;

 constructor(
  public navCtrl: NavController,
  public toastCtrl: ToastController,
  public file:File,
  public diagnostic:Diagnostic,
  public cameraPreview: CameraPreview   
 ) {
  this.checkPermissions();
 }
}

我不知道这是否是正确的解决方案，但解决了我的问题。