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第一个 SwiftUI 项目 :) 我有一个来自顶层视图列表的 NavLink，它调用了一个详细视图。它一直在工作，直到我需要将 Struct 的 @State var 添加到详细信息视图中，现在调用参数列表与编译器期望的不匹配：

    ZStack {
        VStack {
            NavigationView {
                    List(gList) { gard in
                        NavigationLink(destination:
                            SelectGlyph(catList: gard.category,
                                        firstGlyph: gard.ex1,
                                        descr: gard.title,
                                        selectedGlyph: Glyph() )
                        {

详细视图开始：

struct SelectGlyph: View {
    var catList: String
    var firstGlyph: String
    var descr: String
    @State var selectedGlyph:Glyph = Glyph()

    var body: some View {
        ZStack{
            VStack() {
                VStack {
                    VStack {
                        VStack {

字形结构定义为：

struct Glyph: Codable, Identifiable, Equatable {
    var id:String {
        return Gardiner
    }
    var Hieroglyph: String
    var Gardiner: String
    let Unicode: String
    let Description: String
    let Transliteration: String
    let Phonetic: String
    let Notes: String

    init() {
        self.Hieroglyph = ""
        self.Gardiner = ""
        self.Unicode = ""
        self.Description = ""
        self.Transliteration = ""
        self.Phonetic = ""
        self.Notes = ""
    }

    init(Hiero:String, Gard:String, Uni:String, Desc:String, trans:String, phon:String, notes:String) {
        self.Hieroglyph = Hiero
        self.Gardiner = Gard
        self.Unicode = Uni
        self.Description = Desc
        self.Transliteration = trans
        self.Phonetic = phon
        self.Notes = notes
    }
}

错误在顶级 ContentView navLink 目标中：

'SelectGlyph.Type' is not convertible to '(String, String, String, Glyph) -> SelectGlyph'

我在调用列表中尝试了几种变体，并尝试删除 SelectGlyph 中的 @State 包装器，但均无效。任何帮助，将不胜感激！如果我知道如何在视图中指定局部变量而不是调用中的必需参数，那就太好了（我确定我在这里遗漏了一些东西！）

作为对 Asperi 的响应，我尝试了 SelectGlyph 视图的显式初始化程序，但仍然在同一个地方遇到同样的错误：

struct ContentView: View {
    var gList: [GardinerList] = gardinerTest
    var body: some View {
        UINavigationBar.appearance().backgroundColor = .yellow
            return
        ZStack {
            VStack {
                NavigationView {
                        List(gList) { gard in
                            NavigationLink(destination:
                                SelectGlyph(catList: gard.category,  <- Error Here
                                            firstGlyph: gard.ex1,
                                            descr: gard.title,
                                            selectedGlyph: Glyph() )
                            {
                            Text(gard.category)
                                .fontWeight(.bold)
                                .foregroundColor(Color.green)

SelectGlyph 视图现在修改为具有显式 init()。我尝试在 init() 中将 selectedGlyph 指定为 _selectedGlyph 和 self._selectedGlyph

struct SelectGlyph: View {
    var catList: String
    var firstGlyph: String
    var descr: String
    @State private var selectedGlyph:Glyph = Glyph()

    init(catList: String, firstGlyph: String, descr: String, selectedGlyph:Glyph) {
        self.catList = catList
        self.firstGlyph = firstGlyph
        self.descr = descr
        self._selectedGlyph = State<Glyph>(initialValue: selectedGlyph)
    }

    var body: some View {
        ZStack{
            VStack() {
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1 回答 1

1

是这里

                NavigationLink(destination:
                    SelectGlyph(catList: gard.category,
                                firstGlyph: gard.ex1,
                                descr: gard.title,
                                selectedGlyph: Glyph() )

你需要在这里显式初始化，比如

struct SelectGlyph: View {
    var catList: String
    var firstGlyph: String
    var descr: String

    @State private var selectedGlyph:Glyph // << always keep @State private !!

    init(catList: String, firstGlyph: String, descr: String, selectedGlyph:Glyph) {
        self.catList = catList
        self.firstGlyph = firstGlyph
        self.descr = descr
        _selectedGlyph = State<Glyph>(initialValue: selectedGlyph)
    }

更新：还有一个。如果不是复制粘贴错字，那么您错过了 ')'NavigationLink

NavigationLink(destination:
    SelectGlyph(catList: gard.category,
                firstGlyph: gard.ex1,
                descr: gard.title,
                selectedGlyph: Glyph() )) // << here !!
{
于 2020-03-19T15:45:18.197 回答