更新到 Xcode 13 后出现错误破坏了应用程序

Posted 2023-03-11

【中文标题】更新到 Xcode 13 后出现错误破坏了应用程序

【英文标题】：Errors broke app after updating to Xcode 13

【发布时间】：2021-10-07 00:55:32

【问题描述】：

我在 SwiftUI 应用程序生命周期中工作。我刚刚更新了 Xcode，并在一个应用程序上遇到了一堆错误，该应用程序在稍旧版本的 Xcode 上运行良好...... '。

import Swift
import SwiftUI

#if os(ios) || os(tvOS) || targetEnvironment(macCatalyst)

public enum AppKitOrUIKitViewControllerLifecycleEvent 
    case didLoad
    case willAppear
    case didAppear
    case willDisappear
    case didDisappear
    case layoutSubviews


struct _AppKitOrUIKitViewControllerLifecycleEventView<Content: View>: UIViewControllerRepresentable 
    struct Callbacks 
        var onDidLoad: ((UIViewController) -> Void)?
        var onWillAppear: ((UIViewController) -> Void)?
        var onDidAppear: ((UIViewController) -> Void)?
        var onWillDisappear: ((UIViewController) -> Void)?
        var onDidDisappear: ((UIViewController) -> Void)?
        var onWillLayoutSubviews: ((UIViewController) -> Void)?
        var onLayoutSubviews: ((UIViewController) -> Void)?
        
        mutating func setCallback(
            _ callback: ((UIViewController) -> Void)?,
            for event: AppKitOrUIKitViewControllerLifecycleEvent
        ) 
            switch event 
                case .didLoad:
                    self.onDidLoad = callback
                case .willAppear:
                    self.onWillAppear = callback
                case .didAppear:
                    self.onDidAppear = callback
                case .willDisappear:
                    self.onWillDisappear = callback
                case .didDisappear:
                    self.onDidDisappear = callback
                case .layoutSubviews:
                    self.onLayoutSubviews = callback
            
        
    
    
    class UIViewControllerType: UIHostingController<Content> 
        var callbacks: Callbacks?
        
        override func viewDidLoad() 
            super.viewDidLoad()
            
            callbacks?.onDidLoad?(self)
        
        
        override func viewWillAppear(_ animated: Bool) 
            super.viewWillAppear(animated)
            
            callbacks?.onWillAppear?(self)
        
        
        override func viewDidAppear(_ animated: Bool) 
            super.viewDidAppear(animated)
            
            callbacks?.onDidAppear?(self)
        
        
        override func viewWillDisappear(_ animated: Bool) 
            super.viewWillDisappear(animated)
            
            callbacks?.onWillDisappear?(self)
        
        
        override func viewDidDisappear(_ animated: Bool) 
            super.viewDidDisappear(animated)
            
            callbacks?.onDidDisappear?(self)
        
        
        override func viewWillLayoutSubviews() 
            super.viewWillLayoutSubviews()
            
            callbacks?.onWillLayoutSubviews?(self)
        
        
        override func viewDidLayoutSubviews() 
            super.viewDidLayoutSubviews()
            
            callbacks?.onLayoutSubviews?(self)
        
    
    
    func makeUIViewController(context: Context) -> UIViewControllerType 
        UIViewControllerType() //root error view here
    
    
    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) 
        
    


#endif

在 List++.swift 中，我得到上下文闭包类型 '(type1,type2) -> RowContent' 需要 2 个参数，但闭包主体中使用了 1。

import Swift
import SwiftUI

extension List 
    @available(watchOS, unavailable)
    public init<Data: RandomAccessCollection, RowContent: View>(
        _ data: Data,
        selection: Binding<Set<SelectionValue>>,
        @ViewBuilder rowContent: @escaping (Data.Element, _ isSelected: Bool) -> RowContent
    ) where Data.Element: Identifiable, Content == ForEach<Data, Data.Element.ID, HStack<RowContent>>, SelectionValue == Data.Element.ID 
        self.init(data, selection: selection, rowContent:  element in //here this error appears
            rowContent(element, selection.wrappedValue.contains(element.id))
        )
    
    
    @available(watchOS, unavailable)
    public init<Data: RandomAccessCollection, RowContent: View>(
        _ data: Data,
        selection: Binding<Set<SelectionValue>>,
        @ViewBuilder rowContent: @escaping (Data.Element, _ isSelected: Bool) -> RowContent
    ) where Data.Element: Identifiable, Content == ForEach<Data, Data.Element.ID, HStack<RowContent>>, SelectionValue == Data.Element 
        self.init(data, selection: selection, rowContent:  element in //here the error also appears
            rowContent(element, selection.wrappedValue.contains(element))
        )
    


extension List where SelectionValue == Never 
    @available(watchOS, unavailable)
    public init<Data: MutableCollection & RandomAccessCollection, RowContent: View>(
        _ data: Binding<Data>,
        @ViewBuilder rowContent: @escaping (Binding<Data.Element>) -> RowContent
    ) where Data.Element: Identifiable, Content == ForEach<AnyRandomAccessCollection<_IdentifiableElementOffsetPair<Data.Element, Data.Index>>, Data.Element.ID, RowContent> 
        self.init 
            ForEach(data)  (element: Binding<Data.Element>) -> RowContent in
                rowContent(element)
            
        
    

最重要的是，我收到“Command CompileSwift failed with a nonzero exit code”错误。而且这些文件都不是可编辑的……不知道该怎么做。非常感谢任何帮助。

【问题讨论】：

错误在哪几行？

@aheze 将 cmets 添加到有错误的行中，对此感到抱歉

不确定是否相关，但您的回调中有onWillLayoutSubviews，但枚举中缺少相应的案例。哪个版本的 Xcode 是“稍旧的版本”？

如果您无法使其在 Xcode13 中运行，您可以下载 Xcode12，并使用它来构建应用程序，同时修复 Xcode13 中的错误（假设您保留两个 Xcode 安装端旁边）。

不可编辑的文件的来源是什么，是你的吗？

【参考方案1】：

在 Xcode 中转到 ->File 然后 Packages 和 Update to Latest Package Versions。

【讨论】：

谢谢！这对我有用！