UIWebView加载进度并调整网页以适应视图页面？ [英] UIWebView loading progress and adjust web page to fit the view page?

问题描述

我正在使用UIWebView加载网页。

I am using UIWebView to load a web page.

有3个问题：

1。它可以跟踪UIWebView加载页面时的百分比进度吗？

1.It it possible to track the percentage progress when UIWebView is loading the page?

2.我注意到当Safari加载网页时，URL文本字段显示蓝色背景进度指示器告诉用户加载网页的百分比。这是什么技术？

2.I noticed that when Safari loading a web page, the URL textfield displays a blue background progress indicator to tell user the percentage of loading a web page. What is the technology for this?

3.我知道有属性scalesPageToFit

3.I know there is property scalesPageToFit

scalesPageToFit
确定网页是否为布尔值缩放以适应视图，用户可以更改比例。

scalesPageToFit A Boolean value determining whether the webpage scales to fit the view and the user can change the scale.

我尝试将其设置为YES，但看起来它不在公共API和我的应用程序中黑屏停止，我不确定是什么问题？

I try to set it to YES, but it looks like that it is not in public API and my app stopped with black screen, I am not sure what is wrong?

推荐答案

回答＃1）

您可以使用NSURLConnection将网页作为NSData对象拉出，而不是使用UIWebView。当你收到来自你的请求的初始回复

Instead of using a UIWebView, you can pull the webpage down as an NSData object using an NSURLConnection. When you get the initial response from your request from

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

网络服务器应返回预期内容大小的值（应包含在响应）。然后，每次收到数据时，您将继续调用以下方法：

the webserver should return a value of "expected content size" (which should be included in the response). Then you will keep getting the following method called each time you receive data:

 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

继续将数据附加到现有的NSMutableData对象。然后，您可以根据预期的响应大小检查当前数据对象的大小（NSMutableData.length）。

Keep appending the data to an existing NSMutableData object. Then you can check the size of your current data object (NSMutableData.length) against the expected response size.

percentage = (myData.length*100)/theResponse.expectedContentSize;

然后您可以使用该百分比更新进度条！当

Then you can update a progress bar with that percentage! When

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

运行，使用您的数据来调用

runs, use your data to call

[myWebView loadData:myData MIMEType:myMimeType textEncodingName:myEncoding baseURL:baseURL];

它会将您下载的所有内容加载到网络视图中。

and it will load everything you pulled down into your web view.

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