我在从网络链接下载多个 PDF 文件时遇到问题。我拥有的代码可以在 Web 服务器上找到文件，但它只下载大约 360 字节。每个文件大约 2-3 MB，读取时会生成 %PDF，据我了解，这是 PDF 的开始字节。
这段代码会发生什么情况，它传递了一个字符串，然后从一个 plist 文件访问字典，该文件刚刚从包含 PDF 文件的同一 Web 服务器下载。然后该字符串获取 Web 服务器上 PDF 的实际名称，并通过 NSURLConnection 下载到 NSData 对象。最后将其写入 Apps Documents 目录。
任何帮助都会很棒！
-(void)fileToDownload:(NSString *)stringToPDFName {
NSString *downloadfile = [[masterDictionary objectForKey:@"PDF Dictionary"] objectForKey:stringToPDFName];
NSLog(@"downloadFile: %@",downloadfile);
NSString *pathToFile = [NSString stringWithFormat:@"%@%@.pdf",staticURLToPDF,downloadfile];
NSLog(@"pathToFile: %@",pathToFile);
NSError *error;
if ([listOfPDFsAlreadyDownloaded containsObject:pathToFile]) {
NSLog(@"File Already Downloaded From New List: %@", [pathToFile stringByReplacingOccurrencesOfString:staticURLToPDF withString:@""]);
} else {
//download new file
NSString *urlString = [[staticURLToPDF stringByAppendingPathComponent:downloadfile] stringByAppendingPathExtension:@".pdf"];
NSData *pdfDownloading = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] returningResponse:NULL error:&error];
NSLog(@"pdfDownloading Data: %@, Error: %@", pdfDownloading,error);
BOOL written = [pdfDownloading writeToFile:[NSString stringWithFormat:@"%@/POGs/%@.pdf",documentsDirectory,downloadfile] atomically:YES];
NSLog(@"FileDownloading %@/POGs/%@.pdf",documentsDirectory,downloadfile);
if (written) {
NSLog(@"Success");
downloadedDocuments++;
} else {
NSLog(@"File Didn't Save");
}
[listOfPDFsAlreadyDownloaded addObject:pathToFile];
NSLog(@"File to Download: %@",[pathToFile stringByReplacingOccurrencesOfString:staticURLToPDF withString:@""]);
NSLog(@"%i documentsDownloaded",downloadedDocuments);
}
}