从可观察到的@ionic-native/network 值捕获

Question

我正在使用带有 cordova-plugin-network-information 插件的@ionic-native/network 来检查在线-离线状态。但是我在更新网络状态时遇到了困难。

home.ts

import { Network } from '@ionic-native/network';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
public online:boolean=false;
  constructor(public navCtrl: NavController,private network: Network) {
      this.network.onDisconnect().subscribe(() => {
         this.online=false;
         console.log(this.online);      });
      this.network.onConnect().subscribe(() => {
          this.online=true;
        console.log(this.online);
      });
  }

}

home.html

<ion-header>
  <ion-navbar>
    <ion-title>
      Ionic Blank
    </ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>
  <h1>{{online}}</h1>
</ion-content>

但是在运行应用程序时，它只显示 false，但每当我切换 wifi 时，console.log(this.online) 会显示真假变化。关于如何使界面值更改的任何建议。

Answer 1

尝试使用ChangeDetectorRef，如果由于某种原因没有在模板中进行更改检测：

import { ChangeDetectorRef } from '@angular/core';

constructor(private ref: ChangeDetectorRef) { }

  this.network.onDisconnect().subscribe(() => {
     this.online = false;
     console.log(this.online);  
     this.ref.detectChanges(); // run    
  });
  this.network.onConnect().subscribe(() => {
      this.online=true;
      console.log(this.online);
      this.ref.detectChanges(); // run
  });
}

Answer 2

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
public online:boolean=false;
  constructor(public navCtrl: NavController,private network: Network) {}

  ngOnInit(){
      this.network.onConnect().subscribe(() => {
         this.online=true;
         console.log(this.online);

         this.network.onDisconnect().subscribe(() => {
          this.online=false;
          console.log(this.online);
         });

     });

  }

}