'ErrorType'无法转换为'NSError'

Question

我在使用Google Analytics时遇到错误:

'ErrorType'不能转换为'NSError'; 你的意思是用'as!' 迫使低垂？

它发生在我试图调用2次createScreenView时

我这样做:

    override func viewDidLoad() {


        let tracker = GAI.sharedInstance().defaultTracker
        tracker.set(kGAIScreenName, value: "Demande Gratuite")

        var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
        tracker.send(builder)
...
}

    @IBAction func Valider(sender: AnyObject) {
        ...
        let trackerv = GAI.sharedInstance().defaultTracker
        trackerv.set(kGAIScreenName, value: "Demande Envoyé")

        var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
        trackerv.send(builder)


        let eventTracker: NSObject = GAIDictionaryBuilder.createItemWithTransactionId(
            "1",
            name: "test",
            sku: nil,
            category: "IOS",
            price: 1,
            quantity: 1,
            currencyCode: nil).build()
        trackerv.send(eventTracker as! [NSObject : AnyObject])
    }

错误的函数:

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
    // The persistent store coordinator for the application. This implementation creates and returns 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
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("SingleViewCoreData.sqlite")
    var failureReason = "There was an error creating or loading the application's saved data."
    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
}()

另一个问题是:

let tracker = GAI.sharedInstance().defaultTracker
tracker.set(kGAIScreenName, value: "Mentions Légales")

var builder = GAIDictionaryBuilder.createScreenView().build() as! [NSObject : AnyObject]
tracker.send(builder)

来自'NSMutableDictionary!'的强制演员阵容 到'[NSObject:AnyObject]'总是成功; 你的意思是用'as'吗？

和

变量"建设者"从未发生变异; 考虑改为'让'不变

Answer 1

对我来说,在同一个项目中使用AVFoundation和Core Data时也会发生这种情况.

要摆脱错误:

'ErrorType'不能转换为'NSError'; 你的意思是用'as!' 迫使低垂？

或警告:

从'ErrorType'到'NSError'的条件转换总是成功的

从'ErrorType'到'NSError'的强制转换总是成功; 你的意思是用'as'吗？

我这样做了:

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
    // The persistent store coordinator for the application. This implementation creates and returns 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
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("MY_APP_NAME.sqlite")
    var failureReason = "There was an error creating or loading the application's saved data."
    do {
        try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: nil)
    } catch let error as NSError {
        // 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
        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()
    } catch {
        // dummy
    }

    return coordinator
}()

希望这可以帮助 :)