如何在iOS7中使用dynamic文本大小的自定义字体
在iOS7中，有一个新的API用于获取字体，该字体自动调整为用户在其偏好设置中设置的文本大小。
它看起来像这样使用它：
UIFont *myFont = [UIFont fontWithDescriptor:[UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleHeadline] size:0]; 现在，无论您分配的文字是否随着用户更改系统文字大小设置，都会以字体大小上下移动。 （请记住听name:UIContentSizeCategoryDidChangeNotification通知，并更新您的视图以解决更改的大小）。
如何使用非默认Helvetica-Neue字体的dynamic文本？
在这个API的背后，苹果有一些查询表，它返回一个特定的字体系列，大小，有时候象征性的特征（比如粗体）（例如UIFontTextStyleHeadline ）和用户喜欢的文本大小。 后者是一个从sharedApplication脱离的string，如下所示：
[UIApplication sharedApplication].preferredContentSizeCategory;
（我为各种dynamic文本大小注销了Helvetica-Neue的所有默认大小/字体/特征 ）。 我们已经添加了可访问性大小的处理，这很重要 。
所以你所要做的就是build立一个类似的查询表。 我们的devise师为我创build了一个简单的电子表格
请注意，我们添加了几个样式（标题3和4），使其有8个而不是6个可供select。
那么你会想把它放在方便的地方，就像UIFontDescriptor上的一个类别。 你会希望你的方法返回一个像苹果API这样的UIFontDescriptor ，所以用象征性的特征来调整它仍然很容易。
我的类别看起来像这样：
UIFontDescriptor + AvenirNext.h
#import <UIKit/UIKit.h> extern NSString *const ANUIFontTextStyleCaption3; @interface UIFontDescriptor (AvenirNext) +(UIFontDescriptor *)preferredAvenirNextFontDescriptorWithTextStyle:(NSString *)style; @end
UIFontDescriptor + AvenirNext.m
#import "UIFontDescriptor+AvenirNext.h" NSString *const ANUIFontTextStyleCaption3 = @"ANUIFontTextStyleCaption3"; NSString *const ANUIFontTextStyleCaption4 = @"ANUIFontTextStyleCaption4"; @implementation UIFontDescriptor (AvenirNext) +(UIFontDescriptor *)preferredAvenirNextFontDescriptorWithTextStyle:(NSString *)style { static dispatch_once_t onceToken; static NSDictionary *fontSizeTable; dispatch_once(&onceToken, ^{ fontSizeTable = @{ UIFontTextStyleHeadline: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @26, UIContentSizeCategoryAccessibilityExtraExtraLarge: @25, UIContentSizeCategoryAccessibilityExtraLarge: @24, UIContentSizeCategoryAccessibilityLarge: @24, UIContentSizeCategoryAccessibilityMedium: @23, UIContentSizeCategoryExtraExtraExtraLarge: @23, UIContentSizeCategoryExtraExtraLarge: @22, UIContentSizeCategoryExtraLarge: @21, UIContentSizeCategoryLarge: @20, UIContentSizeCategoryMedium: @19, UIContentSizeCategorySmall: @18, UIContentSizeCategoryExtraSmall: @17,}, UIFontTextStyleSubheadline: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @24, UIContentSizeCategoryAccessibilityExtraExtraLarge: @23, UIContentSizeCategoryAccessibilityExtraLarge: @22, UIContentSizeCategoryAccessibilityLarge: @22, UIContentSizeCategoryAccessibilityMedium: @21, UIContentSizeCategoryExtraExtraExtraLarge: @21, UIContentSizeCategoryExtraExtraLarge: @20, UIContentSizeCategoryExtraLarge: @19, UIContentSizeCategoryLarge: @18, UIContentSizeCategoryMedium: @17, UIContentSizeCategorySmall: @16, UIContentSizeCategoryExtraSmall: @15,}, UIFontTextStyleBody: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @21, UIContentSizeCategoryAccessibilityExtraExtraLarge: @20, UIContentSizeCategoryAccessibilityExtraLarge: @19, UIContentSizeCategoryAccessibilityLarge: @19, UIContentSizeCategoryAccessibilityMedium: @18, UIContentSizeCategoryExtraExtraExtraLarge: @18, UIContentSizeCategoryExtraExtraLarge: @17, UIContentSizeCategoryExtraLarge: @16, UIContentSizeCategoryLarge: @15, UIContentSizeCategoryMedium: @14, UIContentSizeCategorySmall: @13, UIContentSizeCategoryExtraSmall: @12,}, UIFontTextStyleCaption1: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @19, UIContentSizeCategoryAccessibilityExtraExtraLarge: @18, UIContentSizeCategoryAccessibilityExtraLarge: @17, UIContentSizeCategoryAccessibilityLarge: @17, UIContentSizeCategoryAccessibilityMedium: @16, UIContentSizeCategoryExtraExtraExtraLarge: @16, UIContentSizeCategoryExtraExtraLarge: @16, UIContentSizeCategoryExtraLarge: @15, UIContentSizeCategoryLarge: @14, UIContentSizeCategoryMedium: @13, UIContentSizeCategorySmall: @12, UIContentSizeCategoryExtraSmall: @12,}, UIFontTextStyleCaption2: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @18, UIContentSizeCategoryAccessibilityExtraExtraLarge: @17, UIContentSizeCategoryAccessibilityExtraLarge: @16, UIContentSizeCategoryAccessibilityLarge: @16, UIContentSizeCategoryAccessibilityMedium: @15, UIContentSizeCategoryExtraExtraExtraLarge: @15, UIContentSizeCategoryExtraExtraLarge: @14, UIContentSizeCategoryExtraLarge: @14, UIContentSizeCategoryLarge: @13, UIContentSizeCategoryMedium: @12, UIContentSizeCategorySmall: @12, UIContentSizeCategoryExtraSmall: @11,}, ANUIFontTextStyleCaption3: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @17, UIContentSizeCategoryAccessibilityExtraExtraLarge: @16, UIContentSizeCategoryAccessibilityExtraLarge: @15, UIContentSizeCategoryAccessibilityLarge: @15, UIContentSizeCategoryAccessibilityMedium: @14, UIContentSizeCategoryExtraExtraExtraLarge: @14, UIContentSizeCategoryExtraExtraLarge: @13, UIContentSizeCategoryExtraLarge: @12, UIContentSizeCategoryLarge: @12, UIContentSizeCategoryMedium: @12, UIContentSizeCategorySmall: @11, UIContentSizeCategoryExtraSmall: @10,}, UIFontTextStyleFootnote: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @16, UIContentSizeCategoryAccessibilityExtraExtraLarge: @15, UIContentSizeCategoryAccessibilityExtraLarge: @14, UIContentSizeCategoryAccessibilityLarge: @14, UIContentSizeCategoryAccessibilityMedium: @13, UIContentSizeCategoryExtraExtraExtraLarge: @13, UIContentSizeCategoryExtraExtraLarge: @12, UIContentSizeCategoryExtraLarge: @12, UIContentSizeCategoryLarge: @11, UIContentSizeCategoryMedium: @11, UIContentSizeCategorySmall: @10, UIContentSizeCategoryExtraSmall: @10,}, ANUIFontTextStyleCaption4: @{ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: @15, UIContentSizeCategoryAccessibilityExtraExtraLarge: @14, UIContentSizeCategoryAccessibilityExtraLarge: @13, UIContentSizeCategoryAccessibilityLarge: @13, UIContentSizeCategoryAccessibilityMedium: @12, UIContentSizeCategoryExtraExtraExtraLarge: @12, UIContentSizeCategoryExtraExtraLarge: @11, UIContentSizeCategoryExtraLarge: @11, UIContentSizeCategoryLarge: @10, UIContentSizeCategoryMedium: @10, UIContentSizeCategorySmall: @9, UIContentSizeCategoryExtraSmall: @9,}, }; }); NSString *contentSize = [UIApplication sharedApplication].preferredContentSizeCategory; return [UIFontDescriptor fontDescriptorWithName:[self preferredFontName] size:((NSNumber *)fontSizeTable[style][contentSize]).floatValue]; } +(UIFontDescriptor *)preferredAvenirNextDemiBoldFontDescriptorWithTextStyle:(NSString *)style { return [[self preferredAvenirNextFontDescriptorWithTextStyle:style] fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold]; } +(UIFontDescriptor *)preferredAvenirNextBoldFontDescriptorWithTextStyle:(NSString *)style { return [UIFontDescriptor fontDescriptorWithName:[self preferredBoldFontName] size:[self preferredAvenirNextFontDescriptorWithTextStyle:style].pointSize]; } +(NSString *)preferredFontName { return @"AvenirNext-Medium"; } +(NSString *)preferredBoldFontName { return @"AvenirNext-Bold"; } @end
我们select使用相同的基本字体AvenirNext-Medium ，然后通过象征性的粗体字，但是如果你想要的话，你可能会疯狂并且在你的字体上指定不同的重量变体，比如AvenirNext-ExtraBold 。
这里的所有都是它的！ 我们这样使用它：
[UIFont fontWithDescriptor:[UIFontDescriptor preferredAvenirNextFontDescriptorWithTextStyle:UIFontTextStyleHeadline] size: 0]
这就是我在Swift中的做法。 我喜欢这个，因为它更通用，它只需要一个表格，它应该可以很好的处理任何字体。 首先我写了一个广义的乘数（在一个getter中）。
var fontSizeMultiplier : CGFloat { get { switch UIApplication.sharedApplication().preferredContentSizeCategory { case UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: return 23 / 16 case UIContentSizeCategoryAccessibilityExtraExtraLarge: return 22 / 16 case UIContentSizeCategoryAccessibilityExtraLarge: return 21 / 16 case UIContentSizeCategoryAccessibilityLarge: return 20 / 16 case UIContentSizeCategoryAccessibilityMedium: return 19 / 16 case UIContentSizeCategoryExtraExtraExtraLarge: return 19 / 16 case UIContentSizeCategoryExtraExtraLarge: return 18 / 16 case UIContentSizeCategoryExtraLarge: return 17 / 16 case UIContentSizeCategoryLarge: return 1.0 case UIContentSizeCategoryMedium: return 15 / 16 case UIContentSizeCategorySmall: return 14 / 16 case UIContentSizeCategoryExtraSmall: return 13 / 16 default: return 1.0 } } }
然后我使用UIFontDescriptor更新字体（例如，在观察者中）：
textView.font = UIFont(descriptor: fontDescriptor!, size: fontDescriptor!.pointSize * fontSizeMultiplier)
尝试这个：
UIFontDescriptor *userHeadLineFont = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleHeadline]; CGFloat userHeadLineFontSize = [userHeadLineFont pointSize]; myFont = [UIFont fontWithName:@"Baskerville" size:userHeadLineFontSize];
但请记住，此代码只是一个近似值（dynamictypes不仅仅是缩放字体大小）。
用swift重写的@Bob Spryn代码：
import UIKit extension UIFontDescriptor { private struct SubStruct { static var preferredFontName: NSString = "OEMeodedPashutPro-Regular" } class func preferredDescriptor(textStyle: NSString) -> UIFontDescriptor { struct Static { static var onceToken : dispatch_once_t = 0 static var fontSizeTable : NSDictionary = NSDictionary() } dispatch_once(&Static.onceToken) { Static.fontSizeTable = [ UIFontTextStyleHeadline: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 26, UIContentSizeCategoryAccessibilityExtraExtraLarge: 25, UIContentSizeCategoryAccessibilityExtraLarge: 24, UIContentSizeCategoryAccessibilityLarge: 24, UIContentSizeCategoryAccessibilityMedium: 23, UIContentSizeCategoryExtraExtraExtraLarge: 23, UIContentSizeCategoryExtraExtraLarge: 22, UIContentSizeCategoryExtraLarge: 21, UIContentSizeCategoryLarge: 20, UIContentSizeCategoryMedium: 19, UIContentSizeCategorySmall: 18, UIContentSizeCategoryExtraSmall: 17 ], UIFontTextStyleSubheadline: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 24, UIContentSizeCategoryAccessibilityExtraExtraLarge: 23, UIContentSizeCategoryAccessibilityExtraLarge: 22, UIContentSizeCategoryAccessibilityLarge: 22, UIContentSizeCategoryAccessibilityMedium: 21, UIContentSizeCategoryExtraExtraExtraLarge: 21, UIContentSizeCategoryExtraExtraLarge: 20, UIContentSizeCategoryExtraLarge: 19, UIContentSizeCategoryLarge: 18, UIContentSizeCategoryMedium: 17, UIContentSizeCategorySmall: 16, UIContentSizeCategoryExtraSmall: 15 ], UIFontTextStyleBody: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 21, UIContentSizeCategoryAccessibilityExtraExtraLarge: 20, UIContentSizeCategoryAccessibilityExtraLarge: 19, UIContentSizeCategoryAccessibilityLarge: 19, UIContentSizeCategoryAccessibilityMedium: 18, UIContentSizeCategoryExtraExtraExtraLarge: 18, UIContentSizeCategoryExtraExtraLarge: 17, UIContentSizeCategoryExtraLarge: 16, UIContentSizeCategoryLarge: 15, UIContentSizeCategoryMedium: 14, UIContentSizeCategorySmall: 13, UIContentSizeCategoryExtraSmall: 12 ], UIFontTextStyleCaption1: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 19, UIContentSizeCategoryAccessibilityExtraExtraLarge: 18, UIContentSizeCategoryAccessibilityExtraLarge: 17, UIContentSizeCategoryAccessibilityLarge: 17, UIContentSizeCategoryAccessibilityMedium: 16, UIContentSizeCategoryExtraExtraExtraLarge: 16, UIContentSizeCategoryExtraExtraLarge: 16, UIContentSizeCategoryExtraLarge: 15, UIContentSizeCategoryLarge: 14, UIContentSizeCategoryMedium: 13, UIContentSizeCategorySmall: 12, UIContentSizeCategoryExtraSmall: 12 ], UIFontTextStyleCaption2: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 18, UIContentSizeCategoryAccessibilityExtraExtraLarge: 17, UIContentSizeCategoryAccessibilityExtraLarge: 16, UIContentSizeCategoryAccessibilityLarge: 16, UIContentSizeCategoryAccessibilityMedium: 15, UIContentSizeCategoryExtraExtraExtraLarge: 15, UIContentSizeCategoryExtraExtraLarge: 14, UIContentSizeCategoryExtraLarge: 14, UIContentSizeCategoryLarge: 13, UIContentSizeCategoryMedium: 12, UIContentSizeCategorySmall: 12, UIContentSizeCategoryExtraSmall: 11 ], UIFontTextStyleFootnote: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 16, UIContentSizeCategoryAccessibilityExtraExtraLarge: 15, UIContentSizeCategoryAccessibilityExtraLarge: 14, UIContentSizeCategoryAccessibilityLarge: 14, UIContentSizeCategoryAccessibilityMedium: 13, UIContentSizeCategoryExtraExtraExtraLarge: 13, UIContentSizeCategoryExtraExtraLarge: 12, UIContentSizeCategoryExtraLarge: 12, UIContentSizeCategoryLarge: 11, UIContentSizeCategoryMedium: 11, UIContentSizeCategorySmall: 10, UIContentSizeCategoryExtraSmall: 10 ], ] } let contentSize = UIApplication.sharedApplication().preferredContentSizeCategory let style = Static.fontSizeTable[textStyle] as NSDictionary return UIFontDescriptor(name: SubStruct.preferredFontName, size: CGFloat((style[contentSize] as NSNumber).floatValue)) } }
用法：
UIFont(descriptor: UIFontDescriptor.preferredDescriptor(UIFontTextStyleBody), size: 0)
与@ bill-weinman的方法类似，我使用了scale，并把它分解成一个不依赖给定字号16的函数。
/// The font scale for a given font size. /// /// - seealso: [Source](https://stackoverflow.com/a/33114525/3643020) /// /// - Parameter fontSize: The font size. /// - Returns: The font scale public func fontScale(for fontSize: CGFloat) -> CGFloat { switch UIApplication.shared.preferredContentSizeCategory { case UIContentSizeCategory.accessibilityExtraExtraExtraLarge: return (fontSize + 8) / fontSize case UIContentSizeCategory.accessibilityExtraExtraLarge: return (fontSize + 7) / fontSize case UIContentSizeCategory.accessibilityExtraLarge: return (fontSize + 6) / fontSize case UIContentSizeCategory.accessibilityLarge: return (fontSize + 5) / fontSize case UIContentSizeCategory.accessibilityMedium: return (fontSize + 4) / fontSize case UIContentSizeCategory.extraExtraExtraLarge: return (fontSize + 3) / fontSize case UIContentSizeCategory.extraExtraLarge: return (fontSize + 2) / fontSize case UIContentSizeCategory.extraLarge: return (fontSize + 1) / fontSize case UIContentSizeCategory.large: return 1.0 case UIContentSizeCategory.medium: return (fontSize - 1) / fontSize case UIContentSizeCategory.small: return (fontSize - 2) / fontSize case UIContentSizeCategory.extraSmall: return (fontSize - 3) / fontSize default: return 1.0 } }
然后可以使用像这样的自定义字体：
/// Light font of specified size. /// /// - Parameter size: Font size. /// - Returns: Light font of specified size. func lightFont(ofSize size: CGFloat) -> UIFont { let scaledSize = size * fontScale(for: size) return UIFont(name: "HelveticaNeueLTStd-Lt", size: scaledSize)! }
在iOS 11中引入了UIFontMetrics类。 为您感兴趣的文本样式创build一个FontMetrics对象。然后，根据标准dynamictypes大小select所需的任何字体。 然后，您可以要求FontMetrics对象根据用户的当前设置缩放该字体。
let bodyMetrics = UIFontMetrics(forTextStyle: .body) let standardFont = ... // any font you want, for standard type size let font = bodyMetrics.scaledFont(for: standardFont)
基于SmartDonkey的@Bob Spryn代码的Swift 2.1-3.0代码。 还更新了@Klaas的苹果尺寸。
import UIKit extension UIFontDescriptor { private struct SubStruct { static var preferredFontName: String = "Roboto-Light" } class func preferredDescriptor(textStyle: NSString) -> UIFontDescriptor { struct Static { static var onceToken : dispatch_once_t = 0 static var fontSizeTable : NSDictionary = NSDictionary() } dispatch_once(&Static.onceToken) { Static.fontSizeTable = [ UIFontTextStyleHeadline: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 23, UIContentSizeCategoryAccessibilityExtraExtraLarge: 23, UIContentSizeCategoryAccessibilityExtraLarge: 23, UIContentSizeCategoryAccessibilityLarge: 23, UIContentSizeCategoryAccessibilityMedium: 23, UIContentSizeCategoryExtraExtraExtraLarge: 23, UIContentSizeCategoryExtraExtraLarge: 21, UIContentSizeCategoryExtraLarge: 19, UIContentSizeCategoryLarge: 17, UIContentSizeCategoryMedium: 16, UIContentSizeCategorySmall: 15, UIContentSizeCategoryExtraSmall: 14 ], UIFontTextStyleSubheadline: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 21, UIContentSizeCategoryAccessibilityExtraExtraLarge: 21, UIContentSizeCategoryAccessibilityExtraLarge: 21, UIContentSizeCategoryAccessibilityLarge: 21, UIContentSizeCategoryAccessibilityMedium: 21, UIContentSizeCategoryExtraExtraExtraLarge: 21, UIContentSizeCategoryExtraExtraLarge: 19, UIContentSizeCategoryExtraLarge: 17, UIContentSizeCategoryLarge: 15, UIContentSizeCategoryMedium: 14, UIContentSizeCategorySmall: 13, UIContentSizeCategoryExtraSmall: 12 ], UIFontTextStyleBody: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 53, UIContentSizeCategoryAccessibilityExtraExtraLarge: 47, UIContentSizeCategoryAccessibilityExtraLarge: 40, UIContentSizeCategoryAccessibilityLarge: 33, UIContentSizeCategoryAccessibilityMedium: 28, UIContentSizeCategoryExtraExtraExtraLarge: 23, UIContentSizeCategoryExtraExtraLarge: 21, UIContentSizeCategoryExtraLarge: 19, UIContentSizeCategoryLarge: 17, UIContentSizeCategoryMedium: 16, UIContentSizeCategorySmall: 15, UIContentSizeCategoryExtraSmall: 14 ], UIFontTextStyleCaption1: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 18, UIContentSizeCategoryAccessibilityExtraExtraLarge: 18, UIContentSizeCategoryAccessibilityExtraLarge: 18, UIContentSizeCategoryAccessibilityLarge: 18, UIContentSizeCategoryAccessibilityMedium: 18, UIContentSizeCategoryExtraExtraExtraLarge: 18, UIContentSizeCategoryExtraExtraLarge: 16, UIContentSizeCategoryExtraLarge: 14, UIContentSizeCategoryLarge: 12, UIContentSizeCategoryMedium: 11, UIContentSizeCategorySmall: 11, UIContentSizeCategoryExtraSmall: 11 ], UIFontTextStyleCaption2: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 17, UIContentSizeCategoryAccessibilityExtraExtraLarge: 17, UIContentSizeCategoryAccessibilityExtraLarge: 17, UIContentSizeCategoryAccessibilityLarge: 17, UIContentSizeCategoryAccessibilityMedium: 17, UIContentSizeCategoryExtraExtraExtraLarge: 17, UIContentSizeCategoryExtraExtraLarge: 15, UIContentSizeCategoryExtraLarge: 13, UIContentSizeCategoryLarge: 11, UIContentSizeCategoryMedium: 11, UIContentSizeCategorySmall: 11, UIContentSizeCategoryExtraSmall: 11 ], UIFontTextStyleFootnote: [ UIContentSizeCategoryAccessibilityExtraExtraExtraLarge: 19, UIContentSizeCategoryAccessibilityExtraExtraLarge: 19, UIContentSizeCategoryAccessibilityExtraLarge: 19, UIContentSizeCategoryAccessibilityLarge: 19, UIContentSizeCategoryAccessibilityMedium: 19, UIContentSizeCategoryExtraExtraExtraLarge: 19, UIContentSizeCategoryExtraExtraLarge: 17, UIContentSizeCategoryExtraLarge: 15, UIContentSizeCategoryLarge: 13, UIContentSizeCategoryMedium: 12, UIContentSizeCategorySmall: 12, UIContentSizeCategoryExtraSmall: 12 ], ] } let contentSize = UIApplication.sharedApplication().preferredContentSizeCategory let style = Static.fontSizeTable[textStyle] as! NSDictionary return UIFontDescriptor(name: SubStruct.preferredFontName, size: CGFloat((style[contentSize] as! NSNumber).floatValue)) } }
这是我如何更新prefferedFontForTextStyle的字体：
UIFont *font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody]; UIFontDescriptor *fontDesc = [font fontDescriptor]; fontDesc = [fontDesc fontDescriptorByAddingAttributes:@{UIFontDescriptorNameAttribute : @"Helvetica", UIFontDescriptorSizeAttribute : @16}]; font = [UIFont fontWithDescriptor:fontDesc size:[fontDesc pointSize]];
只是想跳进来说，有一个库，以帮助集成自定义字体和处理dynamictypes大小的变化。 它被称为，有用的， 字体 （ https://github.com/adamyanalunas/Font ），而不是一个神奇的解决scheme，它build立了一个结构来处理每个自定义字体不同，同时删除样板。
我是这个律所的作者，我认为它很整洁。
下面是我在Swift 3中对@Gobe的回答：
extension UIFontDescriptor { @nonobjc static var fontSizeTable: [UIFontTextStyle : [UIContentSizeCategory : CGFloat]] = { return [ .headline: [ .accessibilityExtraExtraExtraLarge: 23, .accessibilityExtraExtraLarge: 23, .accessibilityExtraLarge: 23, .accessibilityLarge: 23, .accessibilityMedium: 23, .extraExtraExtraLarge: 23, .extraExtraLarge: 21, .extraLarge: 19, .large: 17, .medium: 16, .small: 15, .extraSmall: 14], .subheadline: [ .accessibilityExtraExtraExtraLarge: 21, .accessibilityExtraExtraLarge: 21, .accessibilityExtraLarge: 21, .accessibilityLarge: 21, .accessibilityMedium: 21, .extraExtraExtraLarge: 21, .extraExtraLarge: 19, .extraLarge: 17, .large: 15, .medium: 14, .small: 13, .extraSmall: 12], .body: [ .accessibilityExtraExtraExtraLarge: 53, .accessibilityExtraExtraLarge: 47, .accessibilityExtraLarge: 40, .accessibilityLarge: 33, .accessibilityMedium: 28, .extraExtraExtraLarge: 23, .extraExtraLarge: 21, .extraLarge: 19, .large: 17, .medium: 16, .small: 15, .extraSmall: 14], .caption1: [ .accessibilityExtraExtraExtraLarge: 18, .accessibilityExtraExtraLarge: 18, .accessibilityExtraLarge: 18, .accessibilityLarge: 18, .accessibilityMedium: 18, .extraExtraExtraLarge: 18, .extraExtraLarge: 16, .extraLarge: 14, .large: 12, .medium: 11, .small: 11, .extraSmall: 11], .caption2: [ .accessibilityExtraExtraExtraLarge: 17, .accessibilityExtraExtraLarge: 17, .accessibilityExtraLarge: 17, .accessibilityLarge: 17, .accessibilityMedium: 17, .extraExtraExtraLarge: 17, .extraExtraLarge: 15, .extraLarge: 13, .large: 11, .medium: 11, .small: 11, .extraSmall: 11], .footnote: [ .accessibilityExtraExtraExtraLarge: 19, .accessibilityExtraExtraLarge: 19, .accessibilityExtraLarge: 19, .accessibilityLarge: 19, .accessibilityMedium: 19, .extraExtraExtraLarge: 19, .extraExtraLarge: 17, .extraLarge: 15, .large: 13, .medium: 12, .small: 12, .extraSmall: 12], ] }() class func currentPreferredSize(textStyle: UIFontTextStyle = .body) -> CGFloat { let contentSize = UIApplication.shared.preferredContentSizeCategory guard let style = fontSizeTable[textStyle], let fontSize = style[contentSize] else { return 17 } return fontSize } class func preferredFontDescriptor(fontName: String = "SnellRoundhand", textStyle: UIFontTextStyle = .body) -> UIFontDescriptor { return UIFontDescriptor(name: fontName, size: currentPreferredSize()) } }
在iOS 11中，您可以使用：
var customFont = UIFont.systemFont(ofSize: 17.0) if #available(iOS 11.0, *) { customFont = UIFontMetrics.default.scaledFont(for: customFont) } // use customFont...
另请参阅使用dynamictypesWWDC 2017构build应用程序- 会话245 – iOS时间8:34。
