Attaching iWork documents from iCloud Document Picker does not work because they are directories not files

问题

Converting any iWork documents (Pages, Keynote, Numbers) into NSData from the UIDocumentPickerViewController does not seem to be working since they are not files but directories.

Here is my code:

NSString *fileName = [[url path] lastPathComponent];
NSData *fileData = [[NSFileManager defaultManager] contentsAtPath:[docPickerUrl path]];
NSString *fileExtension = [docPickerUrl pathExtension];
NSString *UTI = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtension, NULL);
NSString *contentType = (__bridge_transfer NSString *)UTTypeCopyPreferredTagWithClass((__bridge CFStringRef)UTI, kUTTagClassMIMEType);

fileData is always nil since NSFileManager can't convert directory to data.

I get url from - (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url

回答1:

I have the same issue here: iOS8: UIDocumentPickerViewController get NSData

The solution is to add iWork documents as zip archives, the simplest way is to use SSZipArchive library, also available as cocoa pod:

pod 'SSZipArchive', '~> 0.3'

回答2:

I recommend going through a NSFileCoordinator object, which is AFAIK required for accessing security-scoped files such as those through Dropbox and iCloud. (Uncomment the first and next-to-last lines in the code below in that case.) The options parameter you want for NSFIleCoordinator's coordinateReadingItemAtURL: is NSFileCoordinatorReadingForUploading. This will read in single files normally, but will turn directories into zip files automatically. Strip off the .zip that is added on and you'll have a valid Pages/Numbers/Keynote file. (It's valid with it on too.)

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
  //[url startAccessingSecurityScopedResource]; // Necessary for security-scoped files
  NSFileCoordinator *coordinator = [[NSFileCoordinator alloc] init];
  NSError *error;
  __block NSData *fileData;

  [coordinator coordinateReadingItemAtURL:url options:NSFileCoordinatorReadingForUploading error:&error byAccessor:^(NSURL *newURL) {
     // File name for use in writing the file out later
     NSString *fileName = [newURL lastPathComponent];
     NSString *fileExtension = [newURL pathExtension];

     // iWork files will be in the form 'Filename.pages.zip'
     if([fileExtension isEqualToString:@"zip"]) {
       if([[[newURL URLByDeletingPathExtension] pathExtension] isEqualToString:@"pages"] ||
          [[[newURL URLByDeletingPathExtension] pathExtension] isEqualToString:@"numbers"] ||
          [[[newURL URLByDeletingPathExtension] pathExtension] isEqualToString:@"key"] ) {
         // Remove .zip if it is an iWork file
         fileExtension = [[newURL URLByDeletingPathExtension] pathExtension];
         fileName = [[newURL URLByDeletingPathExtension] lastPathComponent];
       }
     }

     NSError *fileConversionError;
     fileData = [NSData dataWithContentsOfURL:newURL options:NSDataReadingUncached error:&fileConversionError];

     // Do something with the file data here

  }
  //[url stopAccessingSecurityScopedResource]; // Necessary for security-scoped files
}

Relevant Apple documentation on the NSFileCoordinator options here: https://developer.apple.com/library/ios/documentation/Foundation/Reference/NSFileCoordinator_class/#//apple_ref/c/tdef/NSFileCoordinatorReadingOptions

回答3:

Did you get anywhere with this, i've tried compressing the package using something like SSZipArchive or ZipArchive but get a crash.

This is where've i've got to which might help spark some ideas.

- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
 if (controller.documentPickerMode == UIDocumentPickerModeImport) {
NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtURL:url includingPropertiesForKeys:[NSArray arrayWithObject:NSURLNameKey] options:0 error:nil];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *newDocDirectory = [paths objectAtIndex:0];

NSString *docDirectory = [dirContents objectAtIndex:0];
BOOL isDir=NO;
NSArray *subpaths;
NSString *exportPath = docDirectory;
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:exportPath isDirectory:&isDir] && isDir){
    subpaths = [fileManager subpathsAtPath:exportPath];
}

NSString *archivePath = [newDocDirectory stringByAppendingString:@".zip"];

ZipArchive *archiver = [[ZipArchive alloc] init];
[archiver CreateZipFile2:archivePath];
for(NSString *path in subpaths)
{
    NSString *longPath = [exportPath stringByAppendingPathComponent:path];
    if([fileManager fileExistsAtPath:longPath isDirectory:&isDir] && !isDir)
    {
        NSLog(@"adding file %@", path);
        [archiver addFileToZip:longPath newname:path];
    }
}

NSData *documentData = [NSData dataWithContentsOfFile:archivePath];

//post documentDate as zip file to server

} }

来源：https://stackoverflow.com/questions/26458592/attaching-iwork-documents-from-icloud-document-picker-does-not-work-because-they

标签

ios

cocoa-touch

icloud