离子取消硬BACK按钮覆盖 [英] Ionic cancel hard BACK button override

问题描述

有关于覆盖Ionic中物理Android BACK按钮的问题，以提供自定义行为：

There are questions about overriding the physical Android BACK button in Ionic, to provide custom behaviour:

• Ionic覆盖特定控制器的所有BACK按钮行为


• Ionic：如何覆盖后退按钮功能？

• Ionic override all BACK button behaviour for specific controller
• Ionic: How to override back button function?

但是如何取消覆盖以恢复默认行为？

But how do you cancel the override to restore default behaviour?

我尝试更改处理程序的优先级，希望默认处理程序可能具有更高的优先级。

I have tried changing the priority of the handler, in the hope that a default handler may have a higher priority.

var customBackButton = function() {
    console.log("this is custom behaviour");
};
$ionicPlatform.registerBackButtonAction(
    customBackButton, 101
);
$scope.$on('$destroy', function() {
    $ionicPlatform.registerBackButtonAction(
        customBackButton, 0
    );
});

这不起作用。

推荐答案

离子v1解决方案（已过期）

根据 <$ c的Ionic docs $ c> $ ionicPlatform ， registerBackButtonAction（）返回：

一个函数，当被调用时，将取消注释这个backButtonAction。

A function that, when called, will deregister this backButtonAction.

这可以在代码中看到for registerBackButtonAction（）：

This can be seen in the code for registerBackButtonAction():

  // return a function to de-register this back button action
  return function() {
    delete self.    [action.id];
  };

---

因此，取消注册/取消自定义的正确方法行为是在控制器被销毁时调用该函数：

---

So the correct way to deregister / cancel the custom behaviour is to call that function when the controller is destroyed:

var customBackButton = function() {
    console.log("this is custom behaviour");
};

// registerBackButtonAction() returns a function which can be used to deregister it
var deregisterBackButtonAction = $ionicPlatform.registerBackButtonAction(
    customBackButton, 101
);

$scope.$on('$destroy', function() {
    deregisterBackButtonAction();
});

---

一个更完整的例子，显示如何覆盖&恢复硬按钮和软按钮可以在这里找到：

---

A more complete example showing how to override & restore the hard and soft buttons can be found here:

• Ionic覆盖特定控制器的所有BACK按钮行为

• Ionic override all BACK button behaviour for specific controller

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