UIWebView canGoBack和canGoForward总是返回NO [英] UIWebView canGoBack and canGoForward always return NO

问题描述

我试图直接加载数据到 UIWebView ：

I am trying to load data directly into UIWebView:

[webView loadData:data MIMEType:@"text/html" textEncodingName:@"utf-8" 
          baseURL:nil];

数据是一些包含一些外部链接的html字符串。我试图在 UIWebView 属性上启用后退和前进按钮：

The data is some html string contains some external links. I am trying to enable the back and forward buttons base on the UIWebView properties:

self.forwardBtn.enabled = self.webView.canGoForward;
self.backBtn.enabled = self.webView.canGoBack;

However, even after I clicked on different links in the web view after the initial load, the webView.canGoForward and webView.canGoBack are always returning NO.

Any idea about this?

推荐答案

是如果我使用loadData或loadHTMLString，然后检查在委托的请求的URL：

Ok, I think the problem is if I use loadData or loadHTMLString, and then I check the url of the request in the delegate:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSLog(@"url=%@", [request URL]);
    return YES;
}

看起来url是空的。
我认为这是为什么使用loadData时没有goBack的历史。

It seems like that url is empty. I think this is why there is no history for goBack when using loadData.

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