防止多个离子警报堆叠起来

问题描述

如何检测离子2 实例是否已打开为了不提出另一个警报？

How can I detect if ionic 2 alert ui component instance is already open in order not to present another alert ?

推荐答案

我最终为Ionic的Alert控制器编写了一个包装提供程序，如下所示：

I ended up writing a wrapping provider for Ionic's Alert controller like so :

import { Injectable } from '@angular/core';
import { AlertController } from 'ionic-angular';

@Injectable()
export class Alert {
  public alertPresented: any;
  constructor(public alertCtrl: AlertController) {
    this.alertPresented = false
  }

  present(title, subTitle) {
    let vm = this
    if(!vm.alertPresented) {
      vm.alertPresented = true
      vm.alertCtrl.create({
        title: title,
        subTitle: subTitle,
        buttons: [{
          text: 'OK',
          handler: () => {
            vm.alertPresented = false
          }
        }],
      }).present();
    }
  }
}

其中 alertPresented flag可防止出现多个实例

where alertPresented flag prevents more than one instance from being presented

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