从 SwiftUI.Font 转换为 UIFont

Question

我有一个带有

UIViewRepresentable

的

UITextView

，我想使用 SwiftUI 环境中当前的

UITextView

设置

Font

上的字体。我只需要一个简单的初始化，例如：

UIFont(_ swiftUIFont: Font)

但我找不到这样的东西。并且

Font

类型似乎没有任何我可以用来尝试实现的信息。有人知道两种字体表示之间进行转换的方法吗？

Answer 1

有点破解但有效（做另一个方向作为练习留给读者）。

extension UIFont {
    class func preferredFont(from font: Font) -> UIFont {
        let uiFont: UIFont
        
        switch font {
        case .largeTitle:
            uiFont = UIFont.preferredFont(forTextStyle: .largeTitle)
        case .title:
            uiFont = UIFont.preferredFont(forTextStyle: .title1)
        case .title2:
            uiFont = UIFont.preferredFont(forTextStyle: .title2)
        case .title3:
            uiFont = UIFont.preferredFont(forTextStyle: .title3)
        case .headline:
            uiFont = UIFont.preferredFont(forTextStyle: .headline)
        case .subheadline:
            uiFont = UIFont.preferredFont(forTextStyle: .subheadline)
        case .callout:
            uiFont = UIFont.preferredFont(forTextStyle: .callout)
        case .caption:
            uiFont = UIFont.preferredFont(forTextStyle: .caption1)
        case .caption2:
            uiFont = UIFont.preferredFont(forTextStyle: .caption2)
        case .footnote:
            uiFont = UIFont.preferredFont(forTextStyle: .footnote)
        case .body:
            fallthrough
        default:
            uiFont = UIFont.preferredFont(forTextStyle: .body)
        }
        
        return uiFont
    }
}

Answer 2

这是卢克·霍华德解决方案的重新格式化，以减少文本量

extension UIFont {
  class func preferredFont(from font: Font) -> UIFont {
      let style: UIFont.TextStyle
      switch font {
        case .largeTitle:  style = .largeTitle
        case .title:       style = .title1
        case .title2:      style = .title2
        case .title3:      style = .title3
        case .headline:    style = .headline
        case .subheadline: style = .subheadline
        case .callout:     style = .callout
        case .caption:     style = .caption1
        case .caption2:    style = .caption2
        case .footnote:    style = .footnote
        case .body: fallthrough
        default:           style = .body
     }
     return  UIFont.preferredFont(forTextStyle: style)
   }
}

如果您使用的是 5.9 版本的 Swift，则可以使用 switch 语句返回一个值：

extension UIFont {
  class func preferredFont(from font: Font) -> UIFont {
      let style: UIFont.TextStyle =
      switch font {
        case .largeTitle:   .largeTitle
        case .title:        .title1
        case .title2:       .title2
        case .title3:       .title3
        case .headline:     .headline
        case .subheadline:  .subheadline
        case .callout:      .callout
        case .caption:      .caption1
        case .caption2:     .caption2
        case .footnote:     .footnote
        default:            .body // Includes .body
      }
      return  UIFont.preferredFont(forTextStyle: style)
    }
 }

Answer 3

不，你不能，你必须使用传递给

Font

的参数来创建

UIFont