今天遇到了WebView打开pdf乱码的问题，百度了一下，遂找到了解决方法，在这记录一下，原贴地址
原贴整理了两种解决方法，我试了第二种没成功，也没搞懂是什么问题，下面就整理一下第一种解决方法。
转成二进制文件
如果是WebView，要签代理<UIWebViewDelegate>
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{NSString *pageUrl = request.URL.absoluteString;NSString *lastName =[[pageUrl lastPathComponent] lowercaseString];if ([lastName containsString:@".pdf"]){NSData *data = [NSData dataWithContentsOfURL:request.URL];[self.webview loadData:data MIMEType:@"application/pdf" textEncodingName:@"GBK" baseURL:nil];}return YES;}
如果是WKWebView，要签代理<WKNavigationDelegate>
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{NSString *_webUrlStr = navigationAction.request.URL.absoluteString;NSString *lastName =[[_webUrlStr lastPathComponent] lowercaseString];if ([lastName containsString:@".pdf"]){NSData *data = [NSData dataWithContentsOfURL:navigationAction.request.URL];[self.webView loadData:data MIMEType:@"application/pdf" characterEncodingName:@"GBK" baseURL:nil];}decisionHandler(WKNavigationActionPolicyAllow);}
