Facebook的SDK 4.0的iOS不再快速切換到安裝在設備

Question

我升級到Facebook的SDK 4.6和我使用此代碼根據Scruptions示例的應用中實施新的登錄流在Facebook上的APP：

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init]; 
    [login logInWithReadPermissions:@[self.requiredPermission] 
       fromViewController:self 
          handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) { 
     if ([result.grantedPermissions containsObject:self.requiredPermission]) { 
      NSLog (@"Sucess!"); 
     } else { 
      [self dismissViewControllerAnimated:YES completion:NULL]; 
     } 
    }]; 

實施此應用程序後，不再快速切換到設備上安裝的Facebook應用程序以請求用戶權限，而是顯示用戶可登錄到Facebook的應用程序內的網頁。

我使用正確的代碼嗎？有沒有辦法讓我進入Facebook應用程序，並讓用戶在3.x SDK中確認權限，因爲用戶已經登錄到Facebook應用程序，並且肯定不會再在我的應用程序中登錄。

Answer 1

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init]; 

儘量設置爲login.loginBehavior一個從明年狀態：

typedef NS_ENUM(NSUInteger, FBSDKLoginBehavior) 
{ 
/*! 
    not installed on the device, falls back to \c FBSDKLoginBehaviorBrowser. This is the 
default behavior. 
*/ 

    FBSDKLoginBehaviorNative = 0, 

/*! 
    @abstract Attempts log in through the Safari browser 
*/ 

    FBSDKLoginBehaviorBrowser, 

/*! 
    @abstract Attempts log in through the Facebook account currently signed in through 
    the device Settings. 
    @note If the account is not available to the app (either not configured by user or 
    as determined by the SDK) this behavior falls back to \c FBSDKLoginBehaviorNative. 
*/ 

    FBSDKLoginBehaviorSystemAccount, 

/*! 
    @abstract Attemps log in through a modal \c UIWebView pop up 
    @note This behavior is only available to certain types of apps. Please check the Facebook 
    Platform Policy to verify your app meets the restrictions. 
*/ 

    FBSDKLoginBehaviorWeb, 
};