// Workaround for buggy UIDocument methods

UIDocumentSubclass.m

@implementation UIDocumentSubclass
{
    UIDocumentState myDocumentState;
}

- (void)openWithCompletionHandler:(void (^)(BOOL success))completionHandler
{
    dispatch_queue_t originalQueue = dispatch_get_current_queue();
    NSFileCoordinator *coordinator = [[NSFileCoordinator alloc] initWithFilePresenter:self];

    void (^fileAccessBlock)(void) = ^
    {
        __block NSError *error;
        void (^coordinatedBlock)(NSURL *) = ^(NSURL *newURL)
        {
            BOOL success = [self readFromURL:newURL error:&error];
            if (!success)
                [self handleError:error userInteractionPermitted:YES];

            dispatch_block_t completionBlock = ^
            {
                [self willChangeValueForKey:@"documentState"];
                myDocumentState = (success ? UIDocumentStateNormal : UIDocumentStateClosed);
                [self didChangeValueForKey:@"documentState"];

                if (completionHandler)
                    completionHandler(success);
            };
            dispatch_async(originalQueue, completionBlock);
        };
        [coordinator coordinateReadingItemAtURL:self.fileURL options:0 error:&error byAccessor:coordinatedBlock];
    };
    [self performAsynchronousFileAccessUsingBlock:fileAccessBlock];
}

- (void)closeWithCompletionHandler:(void (^)(BOOL))completionHandler
{
    dispatch_block_t block = ^
    {
        [self willChangeValueForKey:@"documentState"];
        myDocumentState = UIDocumentStateClosed;
        [self didChangeValueForKey:@"documentState"];

        if (completionHandler)
            completionHandler(YES);
    };
    dispatch_async(dispatch_get_current_queue(), block);
}

- (UIDocumentState)documentState
{
    return myDocumentState;
}

@end