为什么FBSDKAccessToken.currentAccessToken（）在我的设备上返回nil，但是在iOS模拟器中可以正常工作？

Question

In my IOS9 application I use the Facebook SDK 4.7.0 graph api to search for public places.

I use the FBSDKApplicationDelegate in my apps delegate which I believe provides me with valid app access token (since I don't use any user specific data an application login is sufficient for me).

When I call FBSDKAccessToken.currentAccessToken() in my ViewController to check if the token is valid I always succeed in the simulator but not when deployed on the real device.

Any suggestions?

I have followed the new ios9 guide and provided the additional info in my plist. Since my application is still in development my Facebook companion app (which holds my app id and secret) are still not available for general public. Could this be a problem?

Answer 1

for checking facebook permission..& give a permission...if permission exist then automatically get accesstoken other wise ask for login...

For Swift

 var login: FBSDKLoginManager = FBSDKLoginManager()
login.logInWithReadPermissions(["public_profile", "email"], handler: { (result:FBSDKLoginManagerLoginResult!, error:NSError!) -> Void in

  if (error != nil)
  {
        //Process error
   }
   else if result.isCancelled
   {
        //Handle cancellations
   }
  else
  {
        // If you ask for multiple permissions at once, you
        // should check if specific permissions missing
        if result.grantedPermissions.contains("email"){
            //Do work
   }
     }
   })

For Objective c:

check Permission like this. following code use ..

if ([[FBSDKAccessToken currentAccessToken]hasGranted:@"email"])
   {
      // add your coding here after login call this block automatically.
   }
   else
   {

//login code  **//if accesstoken expired...then call this block**

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

[loginManager logInWithReadPermissions:@[@"public_profile", @"email"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error)




  }];

   }