错误，必须初始化PFFacebookUtils。

Question

当我在我的应用程序中调用下面的目标C代码时，我会得到一个异常。

    [PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error) {
    if (!user) {
        NSLog(@"Uh oh. The user cancelled the Facebook login.");
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Login Failed"
                                                        message:@"The user cancelled the Facebook login."
                                                       delegate:self
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
    } else if (user.isNew) {
        NSLog(@"User signed up and logged in through Facebook!");
        [self performSegueWithIdentifier:@"logInSegue" sender:sender];
    } else {
        NSLog(@"User logged in through Facebook!");
        [self performSegueWithIdentifier:@"logInSegue" sender:sender];
    }
}];

终止应用程序的原因是：“您必须通过调用+initializeFacebookWithApplicationLaunchOptions‘初始化PFFacebookUtils

下面是AppDelegate用Swift编写的代码，我不太确定如何初始化它在Swift错误中的内容？我正在使用最新版本的Parse，也在我的PodFile中，我有下面的pod 'ParseFacebookUtilsV4‘？知道吗，请怎么解决这个？

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

    // Enable storing and querying data from Local Datastore.
    // Remove this line if you don't want to use Local Datastore features or want to use cachePolicy.
    Parse.enableLocalDatastore()

    Parse.setApplicationId(appID, clientKey: clientKey)
    PFAnalytics.trackAppOpenedWithLaunchOptions(launchOptions)

    let granted: Bool = AppDelegate.IsNotificationPermissionGranted()
    if (granted) {
        AppDelegate.registerNotification()
    }

    //code block from starter project
    PFUser.enableAutomaticUser()

    let defaultACL = PFACL();
    // If you would like all objects to be private by default, remove this line.
    //defaultACL.setPublicReadAccess(true)

    PFACL.setDefaultACL(defaultACL, withAccessForCurrentUser:true)

    if application.applicationState != UIApplicationState.Background {
        // Track an app open here if we launch with a push, unless
        // "content_available" was used to trigger a background push (introduced in iOS 7).
        // In that case, we skip tracking here to avoid double counting the app-open.

        let preBackgroundPush = !application.respondsToSelector("backgroundRefreshStatus")
        let oldPushHandlerOnly = !self.respondsToSelector("application:didReceiveRemoteNotification:fetchCompletionHandler:")
        var noPushPayload = false;
        if let options = launchOptions {
            noPushPayload = options[UIApplicationLaunchOptionsRemoteNotificationKey] != nil;
        }
        if (preBackgroundPush || oldPushHandlerOnly || noPushPayload) {
            PFAnalytics.trackAppOpenedWithLaunchOptions(launchOptions)
        }
    }

    return true
}

Answer 1

在AppDelegate方法中向didFinishLaunchingWithOptions类添加以下代码

PFFacebookUtils.initializeFacebookWithApplicationLaunchOptions(launchOptions)

请注意，您可能需要首先导入ParseFacebookUtilsV4。