如何在UIWebView中以编程方式滚动到底部？ [英] How can I scroll programmatically to the bottom in a UIWebView?

问题描述

我知道之前已经提出类似的问题，但似乎从未得到过回答。我有一个UIWebView并按字符串添加一些内容。我使用UIWebView，因为我动态地添加了一些图像，并使用其他HTML功能。本实施例中的代码被简化。

I know a similar question has been asked before but it seemed never been answered. I have a UIWebView and add some content by string. I use UIWebView because I add some images to it dynamically and also use other HTML features. This example code is simplified.

NSString *myHtmlString = @"SOME LONG TEST STRING 1234567890 123456789 0123456789 0123456789 0123456789 01234567890 WWWWWWWWWW WWWWWWWWWW WWWYYYYYYY YYYYYYYYYY YYYYYYYYYY YYYYYYYYYY YYYYYYYYYY YYYYYYYYY YYYYYYYWWW WWWWWWWWWW WWWWWWWWWW WWWXXXXXXX XXXXXXXXXX XXXZZZZZZZ THIS IS THE END I WANT TO SEE";
NSString *myPath = [[NSBundle mainBundle] bundlePath];
NSURL *myBaseURL = [NSURL fileURLWithPath:myPath];
[myWebView loadHTMLString:myHtmlString baseURL:myBaseURL];

我想看到的是字符串的结尾。我可以在那里滚动，没问题。但是我想以编程方式去那里。

What I want to see is the end of the string. I can scroll there, no problem. But I want to go there programatically.

推荐答案

这很简单。首先，你需要获得网页的高度：

This is fairly simple. First, you'll need to obtain height of the webpage:

NSInteger height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight;"] intValue];

现在您将文档的高度存储在高度变量中。要滚动到底部，您必须再次使用javascript：

Now you have the height of the document stored in the height variable. To scroll to bottom you have to use javascript again:

NSString* javascript = [NSString stringWithFormat:@"window.scrollBy(0, %d);", height];   
[webView stringByEvaluatingJavaScriptFromString:javascript];

当然，您需要在适当的时候给他们打电话。那是

Of course you need to call them in proper moment. That is

– webViewDidFinishLoad:(UIWebView *)webView

你的webview委托的方法。

method of your webview delegate.

希望这是有用的，
Pawel

Hope this was helpful, Pawel

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