在显示之前加载UIWebView的内容 [英] Loading the content of a UIWebView before displaying it

问题描述

我的应用中有一定数量的ViewControllers。它们在应用程序启动时分配和初始化，并在退出时释放。它们由NavigationController用于推送/弹出。在这些ViewControllers中有WebViews（实际上没有别的东西）。

I have a set number of ViewControllers in my app. They are allocated and initialized at application launch and released at exit. They are used by a NavigationController to be pushed/popped. In these ViewControllers there are WebViews (actually there is nothing else).

我的问题是：
当我想要更改WebView的内容（URL）时这不是在当前的TopViewController上，直到我按下/弹出相关的ViewController才会加载内容。

My problem is : When I want to change de content (URL) of a WebView that is not on the current TopViewController, the content isn't loaded until I push/pop the associated ViewController.

过渡我们丑陋。推送/弹出的Viewcontroller最好显示旧内容或最好的空白页面，然后ViewController在完整视图中显示新内容。

And the transition us "ugly". The pushed/popped Viewcontroller shows old content at worst or blank page at best, before the ViewController is in full view THEN the new content is shown.

我尝试了很多东西（甚至将loadRequest放在一个看起来很愚蠢的不同线程中）。

I tried lots of things (even putting the "loadRequest" in a different thread with looks stupid).

你知道如何让事情顺利进行吗？

Do you know any way to make things go smooth?

推荐答案

一般情况下，您应该为缓慢的UIWebView负载规划UI，因为您无法提前计划知道需要多长时间。我经常做的是有一个UIView，它有一个微调器和一个消息，例如Loading ...，它位于UIWebView之上。以下是我如何使用它：

In general you should plan your UI for slow UIWebView loads, because you can't plan ahead to know how long things will take. What I often do is have a UIView that has a spinner and a message such as "Loading..." that is layered on top of the UIWebView. Here's how I use it:

在viewWillAppear中：我取消隐藏加载视图并启动微调器。

In viewWillAppear: I unhide the loading view and start the spinner.

In webViewDidFinishLoad我隐藏了加载视图。

In webViewDidFinishLoad I hide the loading view.

如果调用了webViewDidFail，那么在页面加载时你不会显示一些临时或无效的内容。你可以在这种情况下展示UIAlertView。

If webViewDidFail gets called, then you're not showing some interim or invalid content while the page loads. You can present a UIAlertView in that case.

如果你很好奇，你可以在我的游戏的高分页面看到这个（Lexitect，免费）

If you're curious, you can see this in the high score page of my game (Lexitect, free)

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