How to get native Facebook login on iOS using SDK

问题:

I downloaded the new Facebook iOS SDK 3.1, which promises to have a native login prompt. I ran their sample login app on my iOS 6 device. When I attempted to connect with Facebook, I did not get a native login. Instead, the Facebook app launched - same as the old SDK. Their Facebook login button basically does this:

[appDelegate.session 
    openWithCompletionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
        [self updateView];
    }
];

I thought maybe the sample code isn't calling the right function. So I tried FBSession's other login function.

[appDelegate.session 
    openWithBehavior:FBSessionLoginBehaviorWithNoFallbackToWebView 
    completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
        [self updateView];
    }
];

I tried all possible behaviours and none of them popped up the native login prompt.

回答1:

Did you log into Facebook from the iOS settings first?

Once you do that, their example project Scrumptious will use the native login prompt when you try to connect.

回答2:

Read this: https://developers.facebook.com/docs/howtos/ios-6/#nativeauthdialog

Basically you must request basic permissions and read permissions first and then request publish permissions separately.

回答3:

This is by design, and described in the second section of https://developers.facebook.com/docs/getting-started/facebook-sdk-for-ios/3.1/upgrading-from-3.0/

Basically, you are not able to ask for both read and publish permissions with the iOS6 dialog. Therefore you are more-or-less required to ask for them in a staggered way (e.g. read on first login, and then publish when your app actually needs to publish).

If you insist on using the deprecated method to try and get read & publish at the same time, the SDK has no choice but to return to the web or app-switched technique.