本文介绍了UIWebView canGoBack和canGoForward总是返回NO的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
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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