Objective-C 尝试从短网址下载 PDF

Question

我一直在尝试让它工作，而不是先将它加载到 Web View 上并从中获取 absoluteString，以便我可以下载 URL。我尝试了许多 shortURL 解决方案，但它们从未完全加载 URL。他们总是给我一个不是最终网址的网址，也不是 PDF 网址。任何帮助都会很棒。我正在尝试在应用程序首次打开或检查更新时下载 PDF，但当时它只获取短 url，我必须等到调用 web View 才能获取完整的 url 才能下载PDF 占了上风。

Answer 1

您下载 PDF，就像下载任何其他文件一样。

看看NSURLDownload

- (void)startDownloadingURL:sender
{
    // Create the request.
    NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/index.html"]
                                             cachePolicy:NSURLRequestUseProtocolCachePolicy
                                             timeoutInterval:60.0];

    // Create the download with the request and start loading the data.
NSURLDownload  *theDownload = [[NSURLDownload alloc] initWithRequest:theRequest delegate:self];
    if (!theDownload) {
        // Inform the user that the download failed.
    }
}

- (void)download:(NSURLDownload *)download decideDestinationWithSuggestedFilename:(NSString *)filename
{
    NSString *destinationFilename;
    NSString *homeDirectory = NSHomeDirectory();

    destinationFilename = [[homeDirectory stringByAppendingPathComponent:@"Desktop"]
        stringByAppendingPathComponent:filename];
    [download setDestination:destinationFilename allowOverwrite:NO];
}


- (void)download:(NSURLDownload *)download didFailWithError:(NSError *)error
{
    // Dispose of any references to the download object
    // that your app might keep.
    ...

    // Inform the user.
    NSLog(@"Download failed! Error - %@ %@",
          [error localizedDescription],
          [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}

- (void)downloadDidFinish:(NSURLDownload *)download
{
    // Dispose of any references to the download object
    // that your app might keep.
    ...

    // Do something with the data.
    NSLog(@"%@",@"downloadDidFinish");
}