NSDocument Versions has weird behavior

Question

Saving and Opening of file works perfect, but when selecting 'Revert To Save', on the right side of windows (previous documents) for a blink of second my document versions are seen then just blank copies. And if I restore from this blah copy noting is changed but if I save and reopen the document it is restored to the previous version. I am not sure how it is happening. I have checked the official Apple document and WWDC videos but I am not near to solving this. Please help?

In my NSDocument subclass, I have implemented this methods:

+ (BOOL)autosavesInPlace { return YES; }
+ (BOOL)preservesVersions { return YES; }

and reading from file is done:

- (BOOL)readFromURL:(NSURL *)absoluteURL ofType:(NSString *)typeName error:(NSError **)outError {

if ([typeName compare:@"public.plain-text"] == NSOrderedSame) {
    doucmentString = [[NSString alloc] initWithContentsOfURL:absoluteURL encoding:NSUTF8StringEncoding error:outError];
return YES;
}
if ( outError != NULL ) {
    *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
}
return NO;
}

And in Windows Controller did load I am setting the string to MyDocument which is IBOutlet to NSTextview:

- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
[super windowControllerDidLoadNib:aController];
[myDocument insertText:doucmentString];
[self updateChangeCount:NSChangeAutosaved];
}

UPDATE:

I have solved the version browser behavior by moving the windowsControllerDidLoadNib code to the awakeFromNib. So now I can see the document versions. Phew!

Still when hitting restore, my document doesn't get updated, only when closing and reopening they are show. There must be some updating code that i don't know about. So still looking!

Answer 1

Finally everything is working in versions: I am using this method:

- (BOOL)revertToContentsOfURL:(NSURL *)absoluteURL ofType:(NSString *)typeName error:(NSError **)outError {
    if(absoluteURL != NULL) {
    doucmentString = [[NSString alloc] initWithContentsOfURL:absoluteURL encoding:NSUTF8StringEncoding error:outError];
    return YES;
    } else if (outError) {
      //do nothing
    }
    return NO;
  }

and also changed my awakeFromNib method, instead of insertText I now use insertTextreplacementRange

-(void) awakeFromNib
{
  if (documentString != NULL) {
  [myDocument insertText:doucmentString replacementRange:NSMakeRange(0, [[myDocument textStorage]length])];
  [self updateChangeCount:NSChangeAutosaved];
  }
}

Answer 2

To update your document after restoring a version, one of the methods getting called is - (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError, which is also called when you open a new document. To know if this method is called when restoring a version I use to check if any IBOutlet is already set (i.e. myOutlet!=nil). There may be other manners to achieve this, so let me know if you find one :-) You may also want to refer to this post.