> On 28 Nov 2016, at 23:42, Alastair Houghton <alast...@alastairs-place.net>
> wrote:
>
> On 28 Nov 2016, at 16:18, Gerriet M. Denkmann <gerri...@icloud.com> wrote:
>>
>>
>>> On 28 Nov 2016, at 22:13, Eric E. Dolecki <edole...@gmail.com> wrote:
>>>
>>> You could probably use an attributed string and add an attribute for the
>>> last colon: NSBaselineOffsetAttributeName
>>
>> Yes; but this would be some rather desperate work-around.
>>
>> I was rather thinking of UIFontDescriptorFeatureSettingsAttribute with some
>> Feature type from SFNTLayoutTypes.h (in CoreText).
>> I tried a few types, but no success so far.
>
> The problem you’ve got is that unless the font has a feature that
> specifically allows you to change *any* colon (as opposed to a colon between
> two numerals), you aren’t going to be able to do it by turning on an OpenType
> feature. Even if you can, there doesn’t appear to be a standard feature code
> for this, so you’d be reliant on Apple not changing it in the future.
The WWDC 2015 talk seemed to suggest that there is a standard feature for this.
But there are about 40 feature types in SFNTLayoutTypes.h - no idea what to use.
> What you *could* do instead is get Core Text (or Cocoa Text) to lay out a
> string e.g. “12:00”, then grab the glyph for the centred colon directly from
> that string and use it explicitly, e.g. by attaching a
> kCTGlyphInfoAttributeName attribute to your string with the value set to an
> appropriately constructed CTGlyphInfoRef.
done once:
CGRect frame = { {0,0},{99,99}};
UITextView *dummyTextView = [ [UITextView alloc] initWithFrame: frame
textContainer: nil ];
dummyTextView.text = @“23:21”;
dummyTextView.font = thinFont;
NSLayoutManager *layoutManager = dummyTextView.layoutManager;
[ layoutManager ensureGlyphsForCharacterRange: range ];
[ layoutManager ensureLayoutForCharacterRange: range ];
NSUInteger glyphIndex = [ layoutManager glyphIndexForCharacterAtIndex: 2 ];
centeredColonGlyph = [ layoutManager CGGlyphAtIndex: glyphIndex ];;
and then:
CFMutableAttributedStringRef aStr = (__bridge
CFMutableAttributedStringRef)attributedString;
CTFontRef fontRiff = (__bridge CTFontRef)thinFont;
CTGlyphInfoRef glyInfRef = CTGlyphInfoCreateWithGlyph( centeredColonGlyph,
fontRiff, (CFStringRef)@":" );
CFRange range = { (CFIndex)colonIndex, 1 };
CFAttributedStringSetAttribute( aStr, range, kCTGlyphInfoAttributeName,
glyInfRef );
CFRelease(glyInfRef);
This seems to be working. Nut sure whether there is a more elegant way.
Thanks a lot for your help!
Kind regards,
Gerriet.
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