属性 'x' 是私有的,只能在 class 'y' 内访问

Property 'x' is private and only accessible within class 'y'

我有这段代码:

   import { Component } from '@angular/core';
    import { NavController, Loading, Alert } from 'ionic-angular';

    @Component({
      templateUrl: 'build/pages/search/search.html',
    })

    export class SearchPage {
    constructor (....)
    {
         // code here
    }

    findItems()
    {
            let loading = Loading.create({
                content: "Finding items..."
            });

            this.nav.present(loading);
            // other stuff here
    }

当我 运行 ionic serve 时,一切都显示正确,但是当我单击调用 findItems() 方法的按钮时,出现此错误:

Error TS2341: Property 'create' is private and only accessible within class 'Loading

如果我这样做,会出现类似的错误:

let alert = Alert.create({
                    title: 'Hello!',
                });

在这种情况下,我的终端会出现以下消息:Error TS2341: Property 'create' is private and only accessible within class 'Alert'.

我正在使用 Ionic2 版本 2.0.0-beta.36

编辑:这仅适用于 beta 11 及更高版本

这是因为 create 是 class Loadingprivate 函数,因此无法在 Loading class 之外调用].

Ionic 文档中的 code example 显示了 LoadingController class 用于实例化具有所需选项的 Loading 对象。我将从那里开始。

import { LoadingController }  from 'ionic-angular';

//...

constructor(private loadingController: LoadingController) {

}

findItems() {
  let loading = this.loadingController.create({
  content: "Finding items..."
  duration: 3000
  });

  loading.present();
  // other stuff here
}

Alerts 的语法似乎已更改。这是新语法:

import { AlertController } from 'ionic-angular';

export class MyPage {
  constructor(private alertController: AlertController){
  }

  showAlert() {
    let alert = this.alertController.create({
      title: 'New Friend!',
      subTitle: 'Your friend, Obi wan Kenobi, just accepted your friend request!',
      buttons: ['OK']
    });
    alert.present();
  }
}