ios – ‘ErrorType’不能转换为’NSError’

Google Analytics(分析)有错误：

‘ErrorType’ is not convertible to ‘NSError’; did you mean to use ‘as!’
to force downcast?

当我试图调用2次createScreenView时,会发生这种情况

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])
    }

错误的功能是：

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
}()

另一个问题在这里

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

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

Forced cast from ‘NSMutableDictionary!’ to ‘[NSObject : AnyObject]’
always succeeds; did you mean to use ‘as’?

和

Variable ‘builder’ was never mutated; consider changing to ‘let’
constant

解决方法

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

要摆脱错误：

‘ErrorType’ is not convertible to ‘NSError’; did you mean to use ‘as!’ to force downcast?

或警告：

Conditional cast from ‘ErrorType’ to ‘NSError’ always succeeds

Forced cast from ‘ErrorType’ to ‘NSError’ always succeeds; did you mean to use ‘as’?

我这样做：

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,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",\(wrappedError.userInfo)")
        abort()
    } catch {
        // dummy
    }

    return coordinator
}()

希望这可以帮助 ：)