In my document app I prompt users to save when switching views via:
NSDocument -canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo
I can call this once successfully after which I receive a sheet saying:
This document’s file has been changed by another application since you opened
or saved it.
I figure this is related to -fileModificationDate, but I do update this
(without effect) when saving (see below).
I also note that in -saveToURL:etc I don't actually need or want to create the
file indicated by the url argument.
So perhaps that triggers the file modification warning?
And so it turns out; the following NSDocument override prevents the display of
the warning sheet:
- (NSDate *)fileModificationDate
{
return nil;
}
This question is whether the above is just a rotten hack or is actually
consistent with the internal operation of NSDocument.
I have customised NSDocument saving like so:
- (void)saveDocument:(id)sender
{
[self saveDocumentModel:self];
}
- (void)saveToURL:(NSURL *)url ofType:(NSString *)typeName
forSaveOperation:(NSSaveOperationType)saveOperation completionHandler:(void
(^)(NSError *errorOrNil))completionHandler
{
// this method will be called when attempting to close an edited document
[self saveDocumentModel:self];
// the completion handler will close the window if required
completionHandler(nil);
}
- (void)saveDocumentModel:(id)sender
{
// persist changes in the managed data store.
[self.entities saveChanges];
// clear the document edited status
[self updateChangeCount:NSChangeCleared];
[self setFileModificationDate:[NSDate date]]; // likely pointless in this
case
}
Jonathan
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