阻止在iPad任务切换上重新启动Web应用程序 [英] Prevent web app restart on iPad task switch

问题描述

我在iPad上运行了一个网络应用程序。它以全屏模式运行。如果我的任务切换到另一个应用程序（通过双击主页按钮等），然后切换回我的网络应用程序，然后我的网络应用程序重新启动。

I have a web app running on an iPad. It is running in full-screen mode. If I task switch to another app (by double-clicking the home button etc), then switch back to my web app, then my web app restarts.

有没有在iPad任务切换后收到焦点时阻止Web应用程序重新启动的方法？显然，我只是希望它能够在失去焦点的状态下完全呈现出来。

Is there any way to prevent the web app from restarting when it receives the focus after an iPad task switch? Obviously I just want it to show itself in exactly the state it was in when it lost focus.

谢谢。

推荐答案

不，这是不可能的。

最好的行动方式是将状态保存到localStorage。如果你正在使用eg。用于跟踪状态的URL哈希（例如myApp.html / #logateScreen），可以存储该信息，然后将其应用于location.hash，这将调度window.onhashchange。

The best way to act is to save a state into localStorage. If you're using eg. URL hash for tracking your state (eg. myApp.html/#loginScreen), one can store that info and then apply it on location.hash which would dispatch window.onhashchange.

换句话说（代码只是在飞行中写的示例）：

In other words (codes are just example written on fly):

1 - 将相关信息存储到localStorage：

1 - store relevant information to localStorage:

localStorage.setItem("state", "loginScreen");

2 - 在启动时检索值并将其应用于哈希：

2 - retrieve value on start up and apply it to hash:

location.hash = (localStorage.getItem("state")) ? localStorage.getItem("state") : "";

3 - 将事件监听器绑定到onhashchange并从那里继续：

3 - bind an event listener to onhashchange and proceed from there:

window.addEventListener("hashchange", function() {
    if (location.hash.length) {
        alert("Current state of UI is :"+ location.hash);
    }   
}, false);

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