iphone - 获取 UIWebView 中加载的文件的 mimetypes

Question

我正在尝试将文件的 MIME 类型加载到 UIWebView 中，以便我可以下载它们，我现在的方法有时可以工作，无论如何我可以做得更好吗？

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType 
{   
   NSURL *url = request.URL;
   NSString *main = url.absoluteString;
   //enter code here currentURL = main;
   NSURLRequest *req  = [NSURLRequest requestWithURL:url];
   NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];
   [conn start];
   return YES;
}

NSString *mime = [response MIMEType];
NSLog(@"%@",mime);
DownloadManagerAppDelegate *delegate = (DownloadManagerAppDelegate *)[[UIApplication sharedApplication] delegate];

DLMan *downloadView = [[DLMan alloc] init];
if ([mime rangeOfString:@"application/x-compressed"].length>0 || [mime rangeOfString:@"application/x-zip-compressed"].length>0  || [mime rangeOfString:@"application/zip"].length>0 || [mime rangeOfString:@"multipart/x-zip"].length>0) 
{
  self.tabBarController.selectedIndex = 1;
  [[delegate myDownloadManager]addDownload:currentURL];
  NSLog(currentURL);
  NSLog(@"download");
}

Answer 1

在 NSURLConnection 委托(delegate) didReceiveResponse 中使用如下内容:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{
   NSString *mime = [response MIMEType];
}

---

据我所知，您没有正确获取 MIME，您可能对另一种方法感兴趣，创建 MIME 类型的 plist，例如 mimeTypes.plist

(不一定是所有类型，至少是您要使用或处理的类型)

使用以下方法将它们加载到 NSDicionary 中:

NSString *mainBundlePath = [[NSBundle mainBundle] bundlePath];
NSString *plistPath = [mainBundlePath stringByAppendingPathComponent:@"mimeTypes.plist"];

NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath]

通过搜索目标的扩展名来检查 MIME:

[dict valueForKey:@"mp3"];  // will return audio/mpeg.

请检查此链接以获取 MIME Types 的列表.