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我的問題是：我必須按兩次Facebook登錄按鈕才能獲得FBSDKAccessToken。之後，令牌在整個應用程序的使用過程中保持不變。在按下第一個按鈕時，AccessToken似乎在那裏，並且在觀察者被召喚四次之後再次消失。Swift：我必須撥打Facebook登錄按鈕兩次才能獲得FBSDKAccessToken
當我將觀察者移動到viewDidAppear（）並且取消註釋'FBSDKProfile.enableUpdatesOnAccessTokenChange（true）'行時，也會發生同樣的情況。
我有以下代碼： 在我的AppDelegate：
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Let Facebook API know we finished launching
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
return true
}
func applicationDidBecomeActive(application: UIApplication) {
// Register actions, such as add clicks and app FB statistics
FBSDKAppEvents.activateApp()
}
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
}
在我LoginOrSignupViewController
class LoginOrSignupViewController: UIViewController, FBSDKLoginButtonDelegate {
@IBOutlet weak var buttonFacebooklogin: FBSDKLoginButton!
override func viewDidLoad() {
super.viewDidLoad()
// Customize the facebookLogin button
buttonFacebooklogin.readPermissions = ["public_profile", "email", "user_friends"]
buttonFacebooklogin.delegate = self
//FBSDKProfile.enableUpdatesOnAccessTokenChange(true)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(listenForFBLogin), name: FBSDKAccessTokenDidChangeNotification, object: nil)
}
在我viewDidAppear（）我有一些打印語句。以及在我的Facebook登錄按鈕。我注意到Observer函數被調用了4次，前兩次有一個AccessToken，最後兩次沒有。
當我再次按下Facebook登錄按鈕時，它的行爲就像它應該。 打印語句：
我第一次按下登錄鍵：
Observer listenForFBLogin function...
We got a token here...
<FBSDKAccessToken: 0x7fa0896b5f40>
Observer listenForFBLogin function...
We got a token here...
<FBSDKAccessToken: 0x7fa0896b5f40>
Observer listenForFBLogin function...
Even in the listenForFBLogin the Accestoken is empty...
Observer listenForFBLogin function...
Even in the listenForFBLogin the Accestoken is empty...
User is not logged in...
我第二次按下登錄鍵：
Observer listenForFBLogin function...
We got a token here...
<FBSDKAccessToken: 0x7fa08b8407b0>
Observer listenForFBLogin function...
We got a token here...
<FBSDKAccessToken: 0x7fa08b8407b0>
Tickee isUserLoggedIn: Logged in with Facebook and Firebase...
User is logged in, go to the tabbar...
我的Facebook登錄代碼
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
if error != nil {
// Error login
NSLog("Error van loginButton func:")
NSLog(error.localizedDescription)
} else if result.isCancelled {
// User cancelled login
// NSLog("User cancelled Facebook login")
} else {
// User logged in. Proceed to request Auth from Firebase
// Signup or Login with Firebase
let firebaseRef = Firebase(url: "https://tickee.firebaseio.com/")
let accessToken = FBSDKAccessToken.currentAccessToken().tokenString
// Auth the User in Firebase
firebaseRef.authWithOAuthProvider("facebook", token: accessToken, withCompletionBlock: {
(error, authData) in
if (error != nil) {
NSLog("Login failed")
} else {
// Check if UID is saved to UserDefaults
let userUID = self.tickee.getUserUIDFromUserDefaults()
// Check if UID exists
if userUID == nil {
// UID doesn't not exists, there is no user
print("User doesn't exist yet, create new Facebook user in Firebase...")
// Create User in Firebase
self.tickee.createUserInFirebase("facebook", nameField: nil)
// Save UID in NSUserDefaults
self.tickee.saveUserUIDtoNSUserDefaults()
} else {
print("User exists already, no need to create one again...")
}
print("Done loggin in, now wait for the observer...")
}
})
}
}