> On 29 Nov 2016, at 03:33, Doug Hill <cocoa...@breaqz.com> wrote:
>
> A couple of things to note:
>
[…]
> In any case it's a bad idea to select the exact font since you have to choose
> SF Display or Text which you don't want to do. It should be dynamically
> selected at runtime based on the font size. This behavior is supported by
> using System Font.
>
> Anyways, I would check the font at runtime to make sure it’s SF.
thinFont = <UICTFont:> font-family: “.SFUIDisplay-Ultralight"; font-weight:
normal; font-style: normal; font-size: 70.00pt
> Otherwise, you need a font that supports the Vertically Centered Colon font
> feature. You can check this feature by doing the following:
> • Select your desired font on your Mac for the attributed string in the font
> panel
> • Click the Gear icon in the upper-left corner.
> • Select Typography…
> • Select 'Alternative Stylistic Sets'
> • Select ‘Vertically Centered Colon'
Well, this is kind of difficult: the Font Panel does not show fonts which have
names which start with ‘.’.
So: no SF fonts in my Font Panel.
> Furthermore, I don’t see a way to set these 'Alternative Stylistic'
> attributes from UIAttributedText.
Can be done like this:
NSDictionary *featureCenteredColon = @{ UIFontFeatureTypeIdentifierKey:
@(kStylisticAlternativesType),
UIFontFeatureSelectorIdentifierKey: @(kStylisticAltThreeOnSelector)
};
NSArray *featureArray = @[ featureCenteredColon ];
NSDictionary *featureAtribute = @{ UIFontDescriptorFeatureSettingsAttribute:
featureArray };
UIFontDescriptor *thinDescriptor = thinFont.fontDescriptor;
UIFontDescriptor *newDescr = [ thinDescriptor fontDescriptorByAddingAttributes:
featureAtribute ];
UIFont *betterThinFont = [ UIFont fontWithDescriptor: newDescr size: pointSize
];
> A little experimentation might find the right one.
A “little” is kind of misleading. There are about 40 features, with up to 20
alternatives each.
> OK, after doing some tests, UILabel indeed behaves like you mentioned with
> the SF font. If there aren't numbers on either side of the colon, no vertical
> centering. My guess would see if you can attempt to set the
> kStylisticAlternativesType attribute, as noted below, but as previously
> mentioned, will probably not work automatically due to the different fonts
> for the numerals around the colon.
>
> At this point, I’d say your working solution is probably as good as you're
> going to get.
After you kindly mentioned kStylisticAlternativesType I started to try this.
The documentation is quite helpful in mentioning that some flag “Turns the nth
set of alternates on or off” for n = 1 … 20.
And luckily kStylisticAltThreeOnSelector does indeed turn centred colons on.
So now I have two working solutions:
1. getting the special glyph for the centered colon (as suggested by Alistair)
and:
2. using kStylisticAltThreeOnSelector (as suggested by you).
Thanks a lot. The hint of “kStylisticAlternativesType” was extremely helpful!
Kind regards,
Gerriet.
>
>
>> On Nov 28, 2016, at 11:12 AM, Gerriet M. Denkmann <gerri...@icloud.com>
>> wrote:
>>
>>
>>> 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.
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
