🌀DynamicTypeSize+ext

SwiftUI ⟩ Layout ⟩ Dynamic Type Sizes ⟩

extension

import SwiftUI

extension DynamicTypeSize {
    public var abbreviation: String {
        switch self {
        case .xSmall  : return "XS"
        case .small   : return "S"
        case .medium  : return "M"
        case .large   : return "L"
        case .xLarge  : return "XL"
        case .xxLarge : return "XXL"
        case .xxxLarge: return "XXXL"
        case .accessibility1: return "AC1"
        case .accessibility2: return "AC2"
        case .accessibility3: return "AC3"
        case .accessibility4: return "AC4"
        case .accessibility5: return "AC5"
        @unknown default: return "❓"
        }
    }
}

/// ⭐️ support for `String(describing:)` and `print(_:)`
extension DynamicTypeSize: CustomStringConvertible {
    public var description: String {
        switch self {
        case .xSmall  : return ".xSmall"
        case .small   : return ".small"
        case .medium  : return ".medium"
        case .large   : return ".large"
        case .xLarge  : return ".xLarge"
        case .xxLarge : return ".xxLarge"
        case .xxxLarge: return ".xxxLarge"
        case .accessibility1: return ".accessibility1"
        case .accessibility2: return ".accessibility2"
        case .accessibility3: return ".accessibility3"
        case .accessibility4: return ".accessibility4"
        case .accessibility5: return ".accessibility5"
        @unknown default: return "unknown case"
        }
    }
}

/// ⭐️ custom string interpolation: 
/// usage: `"dynamic type size: \(size)"`
extension DefaultStringInterpolation {
    public mutating func appendInterpolation(_ size: DynamicTypeSize) {
        appendLiteral(String(describing: size))
    }
}

/// ⭐️ LocalizedStringKey interpolation:
/// usage: `Text("\(dynamicTypeSize)")`
/// see [StackOverflow](https://stackoverflow.com/a/64768926/5409815)
extension LocalizedStringKey.StringInterpolation {
    public mutating func appendInterpolation(_ size: DynamicTypeSize) {
        appendInterpolation(String(describing: size))
    }
}

💈範例

import SwiftUI

struct DynamicTypeSizes: View {
    let sizes = DynamicTypeSize.allCases
    var body: some View {
        List(sizes, id: \.self){ size in
            // ⭐️ custom string interpolation with `LocalizedStringKey`
            Text("\(size)")
                .environment(\.dynamicTypeSize, size)   // ⭐️ dynamic type size
        }
    }
}

📘 手冊

• SwiftUI ⟩ EnvironmentValues ⟩

  • DynamicTypeSize (enum)

👥 相關

• Dynamic Type Sizes

• String Interpolation

🗣 討論

• Argument type 'xxx' does not conform to expected type '_FormatSpecifiable' ⭐️