如何在iOS7中使用具有动态文本大小的自定义字体

87

在iOS7中，有新的API用于获取一种字体，该字体会自动调整为用户在其首选项中设置的文本大小。

看起来像这样使用它：

UIFont *myFont = [UIFont fontWithDescriptor:[UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleHeadline] size:0];

现在，您分配给它的任何文本将随着用户更改其系统文本大小设置而在字体大小中上下移动。（请记住听name:UIContentSizeCategoryDidChangeNotification通知并更新您的视图以说明尺寸的变化）。

如何使用带有默认Helvetica-Neue以外的字体的动态文本？

ios  ios7 
— 鲍勃·斯普林（Bob Spryn）
source
是不是该接受答案了？
— 庆阮2015年
从ios-11 +开始，Apple支持使用自定义动态字体大小。为了实现，请看这个答案。
— Umair Ali

Answers:

132

在该API的幕后，苹果具有某种查找表，该表返回特定的字体系列，大小以及有时返回的符号特征（如粗体）（例如UIFontTextStyleHeadline）和用户喜欢的文本大小。后者是sharedApplication类似这样的字符串：

[UIApplication sharedApplication].preferredContentSizeCategory;

（我注销了Helvetica-Neue的所有默认的大小/字体/特征，用于各种动态文本大小）。此后，我们增加了可访问性大小的处理，这一点很重要。

因此，您真正要做的就是建立一个类似的查找表。我们的设计师为我创建了一个简单的电子表格：

字体大小查询表

请注意，我们添加了两种样式（标题3和4），以选择8种而不是6种。

然后，您需要将其放在方便的位置，例如上的类别UIFontDescriptor。您将希望您的方法返回UIFontDescriptor类似于Apple的API，以便仍然可以通过符号特征等轻松进行调整。

我的类别如下：

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

我们选择使用相同的基本字体AvenirNext-Medium，然后使用粗体等（通过符号特征），但是您可能会发疯，并根据需要在字体上指定不同的粗细变体作为查找表的一部分，例如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]
— 鲍勃·斯普林（Bob Spryn）
source
6
优秀的解决方案，但你缺少的辅助常数： UIContentSizeCategoryAccessibilityMedium，UIContentSizeCategoryAccessibilityLarge等等
— 本·杰克逊
有趣。很高兴@BenJackson。谢谢！
— Bob Spryn 2014年
1
为什么不延长UIFont，这样就可以只使用：[UIFont preferredAvenirFontForTextStyle:UIFontTextStyleHeadline]？在底部给出的示例中，尺寸是否多余？
— cleverbit 2014年
2
@richarddas只是为了与苹果的模式保持一致。大小为0会被忽略，只是从描述符中传递正确的大小。
— Bob Spryn 2014年
4
从iOS 8.4开始，Apple对字体大小进行了一些调整：gist.github.com/klaas/750f489e2390389ab812
— Klaas
15

这就是我在Swift中的操作方式。我喜欢它，因为它更通用，只需要一个表，并且可以与任何字体一起很好地工作。首先，我写了一个广义乘数（在一个吸气剂中）。

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，我使用如下方式更新字体（例如，在观察者中）UIFontDescriptor：

textView.font = UIFont(descriptor: fontDescriptor!, size: fontDescriptor!.pointSize * fontSizeMultiplier)
— 比尔·温曼
source
这将不起作用，因为每次您在设置中更新大小时，pointSize都会成倍增加。如果设置默认字体大小，则可以将其用作基本字体，然后乘以fontSizeMultiplier。
— TejAces
@TejAces-效果很好。我已经使用了多年了。由于它返回的是文字值，因此您看不到更改设置后它会如何增加。
— Bill Weinman '18
12

在iOS 11 UIFontMetrics中引入了类。为您感兴趣的文本样式创建一个FontMetrics对象。然后选择所需的任何字体，其大小适合于标准动态类型的大小。然后，您可以要求FontMetrics对象在给定用户当前设置的情况下缩放该字体。

let bodyMetrics = UIFontMetrics(forTextStyle: .body)
let standardFont = ... // any font you want, for standard type size
let font = bodyMetrics.scaledFont(for: standardFont)
— 窗扇
source
8

快速重写@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)
— smartDonkey
source
1
Xcode 7.2使我将最后两行更改为：let style = Static.fontSizeTable[textStyle] as! NSDictionary和return UIFontDescriptor(name: SubStruct.preferredFontName as String, size: CGFloat((style[contentSize] as! NSNumber).floatValue))
— koen
如果我可以做一些在Storyboard中显示首选字体的事情，那将真的很酷。也许通过子类化文本元素。
— 亚伦·布拉彻
7

试试这个：

UIFontDescriptor *userHeadLineFont = [UIFontDescriptor preferredFontDescriptorWithTextStyle:UIFontTextStyleHeadline];
CGFloat userHeadLineFontSize = [userHeadLineFont pointSize];
myFont = [UIFont fontWithName:@"Baskerville" size:userHeadLineFontSize];

但是请记住，该代码只是一个近似值（动态类型不仅仅可以缩放字体大小）。

— 瓦尔弗
source
您能详细说明一下吗？除了缩放之外，我还需要考虑什么？
— hfossli 2015年
2
字体“动态类型”和实际使用的字体之间存在映射。例如，小字体可以变为粗体。我不知道确切的映射。请参阅本文的最后一张图片（“动态类型光学缩放”）：fireballed.org/linked/2013/07/08/ios-7-type，以更好地理解。
— valfer
1
此答案与批准的正确答案相同，但行数有所不同。很好的解决方案。在SWIFT同样stackoverflow.com/questions/35355695/...
— 瓦尼亚
这是@valfer在评论中提到的文章的工作链接：超越Helvetica：iOS 7中字体背后的真实故事
— 0xced
6

与@ bill-weinman的方法类似，我采用了缩放比例，并将其分解为一个不依赖给定字体大小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
    }
}

然后可以将其与以下自定义字体一起使用：

/// 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)!
}
— 金宝汤
source
如果您不希望微调所有内容，那么这还不错。另外，如果您的自定义字体很小，并且默认情况下需要缩放。
— JanBrinker
仅供参考-我的方法不依赖字体大小。它基于比率返回一个值。它与自定义/缩放字体一起正常工作。
— 比尔·温曼
3

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...

另请参阅使用动态类型WWDC 2017构建应用程序-会话245-iOS时间8:34。

— 彼得森
source
2

基于@smartDonkey @Bob Spryn代码端口的Swift 2.1-3.0代码。还使用@Klaas中的Apple尺寸进行了更新。

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))
    }

}
— 戈贝
source
您的解决方案在Swift 3上的错误：'dispatch_once_t' is unavailable in Swift: Use lazily initialized globals instead
— thexande
1

这是我更新prefferedFontForTextStyle字体的方式：

UIFont *font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
UIFontDescriptor *fontDesc = [font fontDescriptor];
fontDesc = [fontDesc fontDescriptorByAddingAttributes:@{UIFontDescriptorNameAttribute : @"Helvetica",
                                                        UIFontDescriptorSizeAttribute : @16}];

font = [UIFont fontWithDescriptor:fontDesc
                             size:[fontDesc pointSize]];
— 奥列格·达努（Oleg Danu）
source
1

这是我对Swift 3中@Gobe的回答的看法：

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())
}
}
— 约书亚·卡登（Joshua Kaden）
source
0

从iOS 11开始，您可以以编程方式调整在可视编辑器中配置的自定义字体：

  1. 使用可视编辑器配置自定义字体
  2. 在viewDidLoad方法中调整字体大小：
@IBOutlet weak var leftLangLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    leftLangLabel.font = UIFontMetrics.default.scaledFont(for: leftLangLabel.font)
}
— 阿列克谢VMP
source
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