iOS Flurry: UI API called from background thread

Question

Implementing flurry using xcode 9.3 beta causes warning about UI API called on background thread. Must be called from main thread only.

Any idea what to do to avoid this - is it only for flurry to solve?

Code used in app delegate:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    let builder = FlurrySessionBuilder.init()
                                      .withAppVersion("1.0")
                                      .withLogLevel(FlurryLogLevelAll)
                                      .withCrashReporting(true)
                                      .withSessionContinueSeconds(10)

    // Replace YOUR_API_KEY with the api key in the downloaded package
    Flurry.startSession("YOUR_API_KEY", with: builder)
    return true
}

Answer 1

Try this :

Objective C

dispatch_async(dispatch_get_main_queue(), ^{
 // add UI related changes here
    });

Swift

DispatchQueue.main.async {
// add UI related changes here
}

Answer 2

UI operation should not happen on the background thread. It should be on main thread.

Move your UI update codes inside the main queue. You can use NSOperationQueue or GCD . NSOperationQueue vs GCD

NSOperationQueue

Objective C:

[[NSOperationQueue mainQueue] addOperationWithBlock:^{
        // UI update code here.
}];

Swift

OperationQueue.main.addOperation { 
    // UI Update code here
}

GCD

Objective C

dispatch_async(dispatch_get_main_queue(), ^{
       // UI update code here.
});

Swift

DispatchQueue.main.async {
    // UI Update code here
}

Answer 3

该API的开发人员承诺进行更新，以使其在iOS 11上线时不使用后台线程。