On Aug 17, 2011, at 10:59 AM, Ross Carter wrote:
> OK, I see the problem. It looks like your source text was copied from a web
> page. (Fonts Arial and Verdana are a clue.) There is something peculiar in
> your text formatting. I'll bet that the web page embedded that text in a
> table and the conversion from web to RTF has left some table artifacts in the
> formatting. The NSParagraphStyle settings in your RTF document look like this:
>
> NSParagraphStyle = "Alignment 4, LineSpacing 0, ParagraphSpacing 0,
> ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0,
> LineHeight 16/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n),
> DefaultTabInterval 36, Blocks (\n \"<NSTextTableBlock: 0x14aa840>\"\n),
> Lists (null), BaseWritingDirection 0, HyphenationFactor 0, TighteningFactor
> 0.05, HeaderLevel 0";
>
> Notice the NSTextTableBlock object. It should not be there.
>
> Also, the minimum line height setting of 16 points is a relic of web layout
> that is not particularly useful in traditional text layout (IMHO), although
> is not a problem per se.
>
> I ran the RTF doc through TextMate to remove all the formatting, pasted it in
> TextEdit, added back the formatting by hand, and the problem was gone. You
> could do this in code; just set NSParagraphStyle textBlocks to nil. Maybe
> while you're at it, set minimumLineHeight to 0 and, if you want more spacing,
> set lineHeightMultiple to 1.1 or thereabouts.
Thank you very much for your help. Removing the text blocks did indeed fix the
problem; I would've never guessed that would be the problem. Here is a category
method that applies the solution when called, in case anyone else ever runs
into this problem with their own non-contiguous series of text views:
@implementation NSMutableAttributedString (PageViewExtension)
- (void)fixAttributesForDisplayInPageView
{
NSMutableSet *weDidTheseAlready = [NSMutableSet set];
[self beginEditing];
[self enumerateAttribute:NSParagraphStyleAttributeName
inRange:NSMakeRange(0UL, self.length) options:0UL usingBlock:^(id value,
NSRange range, BOOL *stop){
NSMutableParagraphStyle *alteredStyle = [value mutableCopy];
NSValue *rangeValue = [NSValue valueWithRange:range];
alteredStyle.textBlocks = nil; // remove text blocks; they
cause text to get cut off during pagination
alteredStyle.minimumLineHeight = 0.0;
[self addAttribute:NSParagraphStyleAttributeName
value:alteredStyle range:range];
[alteredStyle release];
if ([weDidTheseAlready containsObject:rangeValue])
*stop = YES;
else
[weDidTheseAlready addObject:rangeValue];
}];
[self endEditing];
}
@end
Nick Zitzmann
<http://www.chronosnet.com/>
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