SwiftUI 枚举字符串、可编码、可哈希错误

Question

import SwiftUI
import Foundation
import Combine
import CoreLocation

struct structuralCodes: Hashable, Codable, Identifiable {
    var id = UUID()
    var index: Int
    var title: String
    var icon: String
    var isFeatured: Bool
    
    var category: Category
    enum Category: String, CaseIterable, Codable, Hashable {
        case asce = "ASCE"
        case aisc = "AISC"
    }
    
    var imageName: String
    var image: Image {
        Image(imageName)
    }
    
}

var structuralcodes = [
    structuralCodes(index: 1, title: "ASCE", icon: "wind", isFeatured: true, category: "ASCE", imageName: "ASCE"),
    structuralCodes(index: 2, title: "AISC", icon: "wind", isFeatured: false, category: "AISC", imageName: "AISC"),
]

import SwiftUI
import Foundation
import Combine

final class ModelData: ObservableObject {

    @Published var choosecodes: [structuralCodes] = structuralcodes
    
    var features: [structuralCodes] {
        structuralcodes.filter { [=10=].isFeatured }
    }
    
    var categories: [String: [structuralCodes]] {
        Dictionary(
            grouping: choosecodes,
            by: { [=10=].category.rawValue }
        )
    }
} //: ModelData

我在零件的 var 结构代码中遇到错误

(category: "ASCE") //第一个引号下的错误（类别：“AISC”）//第一个引号下的错误

错误为：

Cannot convert value of type 'String' to expected argument type 'structuralCodes.Category

我想当我有 String 的枚举时，它会保存在 var 类别下的案例，因为我输入了一个 String。大写和小写都试过了，怎么都报错

Answer 1

你可以试试这个：

var structuralcodes = [
    structuralCodes(index: 1, title: "ASCE", icon: "wind", isFeatured: true, category: structuralCodes.Category(rawValue: "ASCE")!, imageName: "ASCE"),
    structuralCodes(index: 2, title: "AISC", icon: "wind", isFeatured: false, category: structuralCodes.Category(rawValue: "AISC")!, imageName: "AISC"),
]

所有的Category都是String，但不是所有的String都是Category，这就是为什么你需要在这里跳过箍。强制解包在这里是安全的，因为你显然分配了一个有效的 rawValue

SwiftUI 枚举字符串、可编码、可哈希错误

SwiftUI enum String, Codable, Hashable Error

enums

hashable

swiftui