硬件后退按钮被调用两次ionic5

Question

我尝试配置硬件后退按钮，并在其中调用一个函数：

import { Platform } from '@ionic/angular';
constructor(private platform: Platform) {
  this.platform.backButton.subscribeWithPriority(10, () => {
    //call my function here
  });
}

但当我点击按钮时，它被称为两次。我使用的是ionic5。有什么想法吗？

Answer 1

You can try async and await as follow

import { Platform } from '@ionic/angular';
    constructor(private platform: Platform) {
      this.platform.backButton.subscribeWithPriority(10, async () => {
        await this.functionCall() // Your function call goes here
      });
    }