如何在 iOS 9 中使用新的 San Francisco 字体？
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How to use new San Francisco font in iOS 9?
提问by alexey
Before iOS 9to reference fonts we used fontWithNameof UIFont:
在iOS 9之前我们使用fontWithName的引用字体UIFont：
[UIFont fontWithName:@"HelveticaNeue" size:18]
Now we're moving to iOS 9. How to reference a new San Francisco fontin the same way?
现在我们要迁移到 iOS 9。如何以同样的方式引用新的San Francisco 字体？
We can use it with systemFontOfSizeof UIFont, but how to reference styles other than regular? For example, how to use San Francisco Mediumor San Francisco Lightfonts?
我们可以将它与systemFontOfSizeof一起使用UIFont，但是如何引用常规样式以外的样式？例如，如何使用San Francisco Medium或San Francisco Light字体？
回答by MirekE
In iOS 9 it is the system font, so you could do:
在 iOS 9 中它是系统字体，所以你可以这样做：
let font = UIFont.systemFontOfSize(18)
You canuse the font name directly, but I don't think this is safe:
您可以直接使用字体的名字，但我不认为这是安全的：
let font = UIFont(name: ".SFUIText-Medium", size: 18)!
You can also create the font with specific weight, like so:
您还可以创建具有特定 weight的字体，如下所示：
let font = UIFont.systemFontOfSize(18, weight: UIFontWeightMedium)
or
或者
let font = UIFont.systemFontOfSize(18, weight: UIFontWeightLight)
回答by Marcos Dávalos
Swift 4
斯威夫特 4
label.font = UIFont.systemFont(ofSize: 22, weight: UIFont.Weight.bold)
回答by Vasily Bodnarchuk
Details
细节
- Xcode Version 10.2.1 (10E1001), Swift 5
- Xcode 版本 10.2.1 (10E1001)，Swift 5
Solution
解决方案
import UIKit
extension UIFont {
enum Font: String {
case SFUIText = "SFUIText"
case SFUIDisplay = "SFUIDisplay"
}
private static func name(of weight: UIFont.Weight) -> String? {
switch weight {
case .ultraLight: return "UltraLight"
case .thin: return "Thin"
case .light: return "Light"
case .regular: return nil
case .medium: return "Medium"
case .semibold: return "Semibold"
case .bold: return "Bold"
case .heavy: return "Heavy"
case .black: return "Black"
default: return nil
}
}
convenience init?(font: Font, weight: UIFont.Weight, size: CGFloat) {
var fontName = ".\(font.rawValue)"
if let weightName = UIFont.name(of: weight) { fontName += "-\(weightName)" }
self.init(name: fontName, size: size)
}
}
Usage
用法
guard let font = UIFont(font: .SFUIText, weight: .light, size: 14) else { return }
// ...
let font = UIFont(font: .SFUIDisplay, weight: .bold, size: 17)!
