Question

您好我使用Xcode 7将我的项目从Swift更新为Swift2，并且我收到了此CoreData错误：

svm = SVC(C=0.1)

在这一行

Extra argument 'error' in call

修改

这是我的代码：

if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil, error: &error) == nil {

现在我在第一行收到错误我怎么能解决这个问题？感谢

Answer 1

Swift 2现在提供了一个try / catch机制，并且已经重写了Cocoa API而不是使用传统的Objective C方式返回错误。

你现在应该这样做：

do {
    try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
} catch let error as NSError {
    print(error.localizedDescription)

}

Answer 2

任何有此问题的人都会在下面使用此功能。我遇到过同样的问题。 Apple用一个do try catch短语替换了原来的“if coordinator！.addPersistentStoreWithType”。

do {
        try coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
    } catch {
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason

        dict[NSUnderlyingErrorKey] = error as NSError
        let wrappedError = 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 \(wrappedError), \(wrappedError.userInfo)")
        abort()
    }

    return coordinator
    }()

Swift 2额外的论点＆＃39;错误＆＃39;在电话中

2 个答案: