ios - viewController.title 在 Google Analytics 初始化后为 nil

Question

我关注了谷歌分析 doc将它添加到我的 swift 应用程序中

我已经完成了那里所说的一切，但我的代码在运行时失败了。

这是我在 AppDelegate 中的代码:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {
    loadGoogleAnalytics()
    chooseAndLuanchStoryboard()
    initMembersAfterViewControllerInit()
    return true
}

func loadGoogleAnalytics()
{
    // Configure tracker from GoogleService-Info.plist.
    var configureError:NSError?
    GGLContext.sharedInstance().configureWithError(&configureError)
    assert(configureError == nil, "Error configuring Google services: \(configureError)")

    // Optional: configure GAI options.
    let gai = GAI.sharedInstance()
    gai.trackUncaughtExceptions = true  // report uncaught exceptions
    gai.logger.logLevel = GAILogLevel.Error
}

这是我在 ViewController 中的代码:

override public func viewWillAppear(animated: Bool) {
    super.viewWillAppear(true)

    let name = "Pattern~\(self.title!)"

    // The UA-XXXXX-Y tracker ID is loaded automatically from the
    // GoogleService-Info.plist by the `GGLContext` in the AppDelegate.
    // If you're copying this to an app just using Analytics, you'll
    // need to configure your tracking ID here.
    // [START screen_view_hit_swift]
    let tracker = GAI.sharedInstance().defaultTracker
    tracker.set(kGAIScreenName, value: name)

    let builder = GAIDictionaryBuilder.createScreenView()
    tracker.send(builder.build() as [NSObject : AnyObject])
    // [END screen_view_hit_swift]
}

override public func viewWillDisappear(animated: Bool) {
    keyboardManager.deregisterFromKeyboardNotifications()
    stopRefreshTimer()
}

我收到此运行时错误，因为 let name = "Pattern~\(self.title!)" 中的 self.title 为零

2016-02-05 19:44:44.377 Inline[95803:3750273] The configuration file 'GoogleService-Info.plist' is for another bundle identifier ('com.Inline.inline-ios'). Using this file the services may not be configured correctly. To continue with this configuration file, you may change your app's bundle identifier to 'com.Inline.inline-ios'. Or you can download a new configuration file that matches your bundle identifier from https://developers.google.com/mobile/add and replace the current one.
2016-02-05 19:44:44.383 Inline[95803:] <GMR/INFO> App measurement v.1302000 started
2016-02-05 19:44:44.384 Inline[95803:] <GMR/INFO> To enable debug logging set the following application argument: -GMRDebugEnabled (see http://goo.gl/Y0Yjwu)
2016-02-05 19:44:45.999 Inline[95803:] <GMR/INFO> App measurement enabled
2016-02-05 19:44:46.034 Inline[95803:3750273] Unknown class logo in Interface Builder file.
2016-02-05 19:44:46.048 Inline[95803:3750273] Failed to set (keyPath) user defined inspected property on (UIView): [<UIView 0x7faf9a079730> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.
2016-02-05 19:44:46.048 Inline[95803:3750273] Failed to set (keyPath) user defined inspected property on (UIView): [<UIView 0x7faf9a0729a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.
2016-02-05 19:44:46.048 Inline[95803:3750273] Failed to set (keyPath) user defined inspected property on (UIView): [<UIView 0x7faf9a07f8b0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.
2016-02-05 19:44:46.051 Inline[95803:3750273] Device ID: (null)
2016-02-05 19:44:46.051 Inline[95803:3750273] RegisterDevice RPC request
scanning for beacons
fatal error: unexpectedly found nil while unwrapping an Optional value

如何使 self.title 不为零？

Answer 1

在 didFinishLaunchingWithOptions 上初始化

let gai = GAI.sharedInstance()
let id = "UA-ID"
gai.trackerWithTrackingId(id)
gai.trackUncaughtExceptions = true
gai.logger.logLevel = GAILogLevel.Warning
gai.defaultTracker.allowIDFACollection = false

通过 viewDidAppear 上的 setScreenName 调用谷歌分析的简单方法。

extension UIViewController {
    func setScreeName(name: String) {
        self.title = name
        self.sendScreenView()
    }

    func sendScreenView() {
        let tracker = GAI.sharedInstance().defaultTracker
        tracker.set(kGAIScreenName, value: self.title)
        let builder = GAIDictionaryBuilder.createScreenView()
        tracker.send(builder.build() as [NSObject : AnyObject])
    }

    func trackEvent(category: String, action: String, label: String, value: NSNumber?) {
        let tracker = GAI.sharedInstance().defaultTracker
        let trackDictionary = GAIDictionaryBuilder.createEventWithCategory(category, action: action, label: label, value: value)
        tracker.send(trackDictionary.build() as [NSObject : AnyObject])
    }
}