Hi,
Well, I used a tech support incident and it was determined that I should submit
a bug report, which I have done. (And the tech support incident was credited
back to my account.)
-- Mike
> Message: 1
> Date: Fri, 10 Apr 2015 19:18:22 -0400
> From: "Michal L. Wright" <m...@raccoonbend.com>
> To: cocoa-dev@lists.apple.com
> Subject: Images Being Substituted in UIText .attributedText
> Message-ID: <ece72d09-3e27-42f8-860f-1a525d218...@raccoonbend.com>
> Content-Type: text/plain; charset=windows-1252
>
> Hi,
>
> I have a pair of almost-matching flat-file database apps, iData Pro for the
> Mac and iData Pro-Mobile for mobile devices. Datafiles for both apps are
> written to disk as a plist (xml) file and are almost identical in structure.
> Up till now, iData Pro-Mobile could display only plain text. Now I’m
> modifying it to display formatted text, like the Mac version.
>
> Datafiles are organized into records.
>
> Each record includes a block of RTFD text, which is an NSAttributedString
> object that is displayed in an NSTextView in iData Pro and in a UITextView in
> iData Pro-Mobile. A typical NSAttributedString is encoded as NSData like this
> in the xml:
>
> <key>TextRTFD</key>
> <data>
> cnRmZAAAAAADAAAAAgAAAAcAAABUWFQucnRmAQAAAC51AQAAKwAA
> AAEAAABtAQAAe1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcY29jb2Fy
> dGYxMjY1XGNvY29hc3VicnRmMjEwCntcZm9udHRibFxmMFxmbmls
> XGZjaGFyc2V0MCBHZW9yZ2lhO30Ke1xjb2xvcnRibDtccmVkMjU1
> XGdyZWVuMjU1XGJsdWUyNTU7fQpccGFyZFx0eDU2MFx0eDExMjBc
> dHgxNjgwXHR4MjI0MFx0eDI4MDBcdHgzMzYwXHR4MzkyMFx0eDQ0
> ODBcdHg1MDQwXHR4NTYwMFx0eDYxNjBcdHg2NzIwCgpcZjBcZnMy
> NCBcY2YwIE1yLiBGcmVkIEZhcmtsZVwKMTIzNDU2NyBOb3J0aHdl
> c3QgQnJvYWR3YXkgQXZlLlwKQXVzdGluLCBUWCAgNzc3NzdcClwK
> V29yazogNTE1LTU1NS0wOTg3XApGQVg6IDUxNS01NTUtNjc4OVwK
> SG9tZTogNTE1LTU1NS00NTY3XApcCn0BAAAAIwAAAAEAAAAHAAAA
> VFhULnJ0ZhAAAADBUAtVtgEAAAAAAAAAAAAA
> </data>
>
> The UIText and NSAttributedString calls for iOS are a bit different from the
> ones I use on the Mac, but I now have the mobile app showing formatted text
> with embedded images. I’ve added “Insert Image” and “Set Font” menu items to
> the editing menu, and they are working fine. “Insert Image” gives access to
> saved photos, and “Set Font” includes a font picker and a color picker.
>
> The results are great, except for one rather bizarre glitch — when stepping
> throught records (and making no changes), images in the currently displayed
> record are occasionally replaced by images from other previously displayed
> records.
>
> I’ve hacked around a bit, but don’t really have any idea what could be
> causing this behavior. It’s almost as though the system is caching the images
> and getting them mixed up at display time. This occurs in what seems to be an
> entirely random way. I haven’t been able to find any repeatable pattern of
> replacements.
>
> A particularly odd thing is that if I select and copy an incorrect image,
> then paste it into a different datafile, the correct image is pasted in. This
> seems to indicate some kind of disconnect between the display of images and
> the underlying attributed text.
>
> Here’s what I do iData Pro when parsing the NSData TextRTFD for the display
> of a new record:
>
> IBOutlet NSTextView *freeformTextView; // From my
> RecordViewController.h file. RecordViewController is a UIViewController
>
> NSUInteger length = [freeformTextViewString length];
>
> // Clear attributes displayed for the previous record
> NSRange fullllRange = NSMakeRange(0, length);
> [freeformTextView setTypingAttributes:nil];
> [[freeformTextView textStorage] removeAttribute:NSLinkAttributeName
> fullllRange];
>
> // Replace the text; use the RTFD version if it is available
> NSData *textRTFD = [record textRTFD]; // from the xml datafile
> if (textRTFD])
> [freeformTextView replaceCharactersInRange:allRange
> withRTFD:textRTFD];
>
> This results in the display of the RTFD styled text with any attachments,
> including links, images, and/or sound files. (And the preceding code has been
> in use for over a decade with no problems.)
>
> Here’s what I do in iData Pro-Mobile:
>
> // Replace the attributedText; use the RTFD version if it is available
> NSData *textRTFD = [record textRTFD];
> if (textRTFD)
> {
> NSError *error;
> NSDictionary *dict = [NSDictionary
> dictionaryWithObjectsAndKeys: NSRTFDTextDocumentType,
> NSDocumentTypeDocumentAttribute, nil];
>
> NSAttributedString *attributedText = [[NSAttributedString
> alloc] initWithData:textRTFD options:dict documentAttributes:NULL
> error:&error];
>
> [freeformTextView setAttributedText:attributedText];
> }
>
> Only images are affected. Text formatting — text content, fonts, point sizes,
> text colors — remains stable. When a datafile is transferred to the Mac and
> opened in the Mac app, it displays as expected.
>
> Is it obvious that I’m doing something wrong, or could this be an iOS bug?
>
> Thanks,
> Mike Wright
>
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