无法在 AppDelegate coredata，Swift 2 中使用（域，代码，userInfo）调用类型“NSError”的初始化程序

Posted 2023-02-23

【中文标题】无法在 AppDelegate coredata，Swift 2 中使用（域，代码，userInfo）调用类型“NSError”的初始化程序

【英文标题】：cannot invoke initialiser for type "NSError" with (domain, code, userInfo) in AppDelegate coredata, Swift 2

【发布时间】：2015-09-29 06:59:13

【问题描述】：

我也刚刚更新到 Xcode 7，我在 AppDelegate.swift 中遇到了这个问题

 lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = 
    // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
    // Create the coordinator and store
    var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("Inclinometer.sqlite")
    var error: NSError? = nil
    var failureReason = "There was an error creating or loading the application's saved data."


    let mOptions = [NSMigratePersistentStoresAutomaticallyOption: true,
        NSInferMappingModelAutomaticallyOption: true]
    do 
        try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: mOptions)
     catch var error1 as NSError 
        error = error1

        // Report any error we got.
        let dict = NSMutableDictionary()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason
        dict[NSUnderlyingErrorKey] = error
        error = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(error), \(error!.userInfo)")
        abort()
     catch 
        fatalError()
    

    return coordinator
()

显示在这一行

error = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)

不能使用类型参数列表（域、代码、用户信息）调用类型“NSError”的初始化程序。应该如何更改它以使其在 Xcode 7 中运行？

【参考方案1】：

NSError 初始化程序需要 [String: AnyObject] 类型的参数用于 userInfo。你必须这样写：

let dict : [String: AnyObject] = [
  NSLocalizedDescriptionKey: "Failed to initialize the application's saved data",
  NSLocalizedFailureReasonErrorKey : failureReason
  NSUnderlyingErrorKey : error
]

另外，我认为您不需要创建额外的错误变量（定义在哪里？）并覆盖它。

【讨论】：

您好，现在仅通过此“let dict:”显示“表达式类型不明确，没有更多上下文”。你的意思是我不需要定义"error = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)"？

此外，我认为它不仅期望字符串。参见“NSError(domain: , code: , userInfo: ))”

在 Xcode 7.0 中不起作用（问题询问）。我得到“没有更多上下文的表达式类型不明确

【参考方案2】：

似乎您必须更加具体地说明您在字典中输入的内容，在 XCode 7.0 中这对我有用

let dict : [String: AnyObject] = [
        NSLocalizedDescriptionKey: "Failed to initialize the application’s saved data",
        NSLocalizedFailureReasonErrorKey: String(failureReason),
        NSUnderlyingErrorKey: String(error),
    ]
error = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)