ionic-framework - 平台4的Ionic 4替代品

我环顾了Ionic 4的新平台，似乎已从其中删除了registerBackButtonAction功能。

还有其他替代方法可以处理Android硬件后退按钮吗？

最佳答案

更新：此问题已在v4.0.0-beta.8 (dfac9dc)中修复



Related: how to integrate hardware back button into ionic4 navigation



这是在GitHub和Ionic Forums中的Twitter上跟踪的
在没有正式修复之前，您可以使用以下解决方法：

this.platform.backButton.subscribe(() => {
  // code that is executed when the user pressed the back button
})

// To prevent interference with ionic's own backbutton handling
// you can subscribe with a low priority instead
this.platform.backButton.subscribeWithPriority(0, () => {
  // code that is executed when the user pressed the back button
  // and ionic doesn't already know what to do (close modals etc...)
})

请注意，您需要保存subscribe(...)的结果
如果您想再次取消订阅。



旧答案:(截至2018年4月已过期）

registerBackButtonAction是just a wrapper的corresponding Cordova call。

因此，您可以将旧电话转到registerBackButtonAction：

this.platform.registerBackButtonAction(() => {
  // code that is executed when the user pressed the back button
});

并替换为：

this.platform.ready().then(() => {
  document.addEventListener("backbutton", () => {
    // code that is executed when the user pressed the back button
  });
});