從Social.framework（iOS6）獲取Facebook訪問令牌

Question

我需要檢索我在系統設置應用程序中設置的系統帳戶的Facebook訪問令牌。

我知道Social.framework（iOS6的）知道我可以執行API的所有我的FB帳戶信息&調用這個帖子http://blogs.captechconsulting.com/blog/eric-stroh/ios-6-tutorial-integrating-facebook-your-applications

但使用SLRequest類，喜歡圖形API，我的問題是 - 我怎麼能檢索我的Facebook系統帳戶的訪問令牌？

我找到了解決方案，Twitter的https://dev.twitter.com/docs/ios/using-reverse-auth，但你能不能幫我與Facebook

Answer 1

如果你已經知道如何獲得帳戶存儲設置，這裏是它周圍的代碼展示瞭如何獲得訪問令牌：

@property (strong, nonatomic) ACAccountStore *accountStore; 
@property (strong, nonatomic) ACAccount *fbAccount; 

... 

@synthesize accountStore = _accountStore; 
@synthesize fbAccount = _fbAccount; 

... 

// Initialize the account store 
self.accountStore = [[ACAccountStore alloc] init]; 

// Get the Facebook account type for the access request 
ACAccountType *fbAccountType = [self.accountStore 
    accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook]; 

// Request access to the Facebook account with the access info 
[self.accountStore requestAccessToAccountsWithType:fbAccountType 
              options:fbInfo 
             completion:^(BOOL granted, NSError *error) { 
    if (granted) { 
     // If access granted, then get the Facebook account info 
     NSArray *accounts = [self.accountStore 
          accountsWithAccountType:fbAccountType]; 
     self.fbAccount = [accounts lastObject]; 

     // Get the access token, could be used in other scenarios 
     ACAccountCredential *fbCredential = [self.fbAccount credential];    
     NSString *accessToken = [fbCredential oauthToken]; 
     NSLog(@"Facebook Access Token: %@", accessToken); 


     // Add code here to make an API request using the SLRequest class 

    } else { 
     NSLog(@"Access not granted"); 
    } 
}];