我试图为otf字体pluto-sans启用风格替代品，但无论我做什么，默认设置都是它使用的。
当我查看xcode调试中的字体属性时，我得到以下内容
(
{
CTFeatureTypeIdentifier = 0;
CTFeatureTypeName = "All Typographic Features";
CTFeatureTypeNameID = "-100";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = On;
CTFeatureSelectorNameID = "-101";
}
);
},
{
CTFeatureTypeExclusive = 1;
CTFeatureTypeIdentifier = 6;
CTFeatureTypeName = "Number Spacing";
CTFeatureTypeNameID = "-700";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = "Monospaced Numbers";
CTFeatureSelectorNameID = "-701";
},
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 4;
CTFeatureSelectorName = "No Change";
CTFeatureSelectorNameID = "-705";
}
);
},
{
CTFeatureTypeExclusive = 1;
CTFeatureTypeIdentifier = 10;
CTFeatureTypeName = "Vertical Position";
CTFeatureTypeNameID = "-1100";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = "Normal Vertical Position";
CTFeatureSelectorNameID = "-1101";
},
{
CTFeatureSelectorIdentifier = 1;
CTFeatureSelectorName = "Superiors/Superscripts";
CTFeatureSelectorNameID = "-1102";
},
{
CTFeatureSelectorIdentifier = 3;
CTFeatureSelectorName = Ordinals;
CTFeatureSelectorNameID = "-1104";
},
{
CTFeatureSelectorIdentifier = 4;
CTFeatureSelectorName = "Scientific Inferiors";
CTFeatureSelectorNameID = "-1105";
}
);
},
{
CTFeatureTypeIdentifier = 11;
CTFeatureTypeName = "Contextual Fractional Forms";
CTFeatureTypeNameID = "-1200";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorIdentifier = 2;
CTFeatureSelectorName = On;
CTFeatureSelectorNameID = "-1203";
}
);
},
{
CTFeatureTypeExclusive = 1;
CTFeatureTypeIdentifier = 17;
CTFeatureTypeName = Alternates;
CTFeatureTypeNameID = "-1800";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = "No Alternates";
CTFeatureSelectorNameID = "-1801";
},
{
CTFeatureSelectorIdentifier = 1;
CTFeatureSelectorName = "Alternate 1";
CTFeatureSelectorNameID = "-1802";
},
{
CTFeatureSelectorIdentifier = 2;
CTFeatureSelectorName = "Alternate 2";
CTFeatureSelectorNameID = "-1803";
},
{
CTFeatureSelectorIdentifier = 3;
CTFeatureSelectorName = "Alternate 3";
CTFeatureSelectorNameID = "-1804";
},
{
CTFeatureSelectorIdentifier = 4;
CTFeatureSelectorName = "Alternate 4";
CTFeatureSelectorNameID = "-1805";
},
{
CTFeatureSelectorIdentifier = 5;
CTFeatureSelectorName = "Alternate 5";
CTFeatureSelectorNameID = "-1806";
}
);
},
{
CTFeatureTypeExclusive = 1;
CTFeatureTypeIdentifier = 21;
CTFeatureTypeName = "Number Case";
CTFeatureTypeNameID = "-2200";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorIdentifier = 1;
CTFeatureSelectorName = "Lining Figures";
CTFeatureSelectorNameID = "-2202";
},
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 2;
CTFeatureSelectorName = "No Change";
CTFeatureSelectorNameID = "-2203";
}
);
},
{
CTFeatureTypeExclusive = 1;
CTFeatureTypeIdentifier = 22;
CTFeatureTypeName = "Text Spacing";
CTFeatureTypeNameID = "-2300";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 7;
CTFeatureSelectorName = "No Change";
CTFeatureSelectorNameID = "-2308";
},
{
CTFeatureSelectorIdentifier = 8;
CTFeatureSelectorName = "No Kerning";
CTFeatureSelectorNameID = "-2309";
}
);
},
{
CTFeatureTypeIdentifier = 33;
CTFeatureTypeName = "Case-Sensitive Layout";
CTFeatureTypeNameID = "-3400";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = "Capital Forms";
CTFeatureSelectorNameID = "-3401";
},
{
CTFeatureSelectorIdentifier = 2;
CTFeatureSelectorName = "Capital Spacing";
CTFeatureSelectorNameID = "-3403";
}
);
},
{
CTFeatureTypeIdentifier = 35;
CTFeatureTypeName = "Alternative Stylistic Sets";
CTFeatureTypeNameID = "-3600";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorIdentifier = 2;
CTFeatureSelectorName = "Stylistic Set 1";
CTFeatureSelectorNameID = "-3603";
},
{
CTFeatureSelectorIdentifier = 4;
CTFeatureSelectorName = "Stylistic Set 2";
CTFeatureSelectorNameID = "-3605";
},
{
CTFeatureSelectorIdentifier = 6;
CTFeatureSelectorName = "Stylistic Set 3";
CTFeatureSelectorNameID = "-3607";
}
);
},
{
CTFeatureTypeIdentifier = 36;
CTFeatureTypeName = "Contextual Alternates";
CTFeatureTypeNameID = "-3700";
CTFeatureTypeSelectors = (
{
CTFeatureSelectorDefault = 1;
CTFeatureSelectorIdentifier = 0;
CTFeatureSelectorName = "Contextual Alternates";
CTFeatureSelectorNameID = "-3701";
}
);
}
)
上面打印出来的代码如下：
var a = CTFontCopyFeatures(label.font)
println(a)
我尝试使用以下代码激活样式选项：
var newfont = UIFontDescriptor(name: "Pluto Sans Cond Medium", size: CGFloat(0.0))
label.font = UIFont(descriptor: newfont.fontDescriptorByAddingAttributes([UIFontFeatureTypeIdentifierKey: kStylisticAlternativesType, UIFontFeatureSelectorIdentifierKey: kStylisticAltOneOnSelector]), size: CGFloat(17))
我对swift和字体相当新，但据我所知，这应该激活风格的替代品，任何帮助都将非常感激
答案 0 :(得分：2)
这篇博客文章引导我找到一个解决方案：http://generic.cx/essays/font-descriptors/我最终像这样扩展了uifont：
extension UIFont {
func activateAlternatives() -> UIFont {
let oDesc = self.fontDescriptor()
let features: [NSObject: AnyObject] = [
UIFontDescriptorFeatureSettingsAttribute: [
[
UIFontFeatureTypeIdentifierKey:
kStylisticAlternativesType,
UIFontFeatureSelectorIdentifierKey:
kStylisticAltOneOnSelector
]
,[
UIFontFeatureTypeIdentifierKey:
kStylisticAlternativesType,
UIFontFeatureSelectorIdentifierKey:
kStylisticAltTwoOnSelector
],
[
UIFontFeatureTypeIdentifierKey:
kStylisticAlternativesType,
UIFontFeatureSelectorIdentifierKey:
kStylisticAltThreeOnSelector
]
]
]
let newDesc = oDesc.fontDescriptorByAddingAttributes(features)
return UIFont(descriptor: newDesc, size: 0.0)
}
}
我认为我的问题实际上并不是代码错误，而是我需要使用所有三种替代方法来获取我期待的所有字形