如何检查用户是否使用iOS中的FBSDKLoginKit登录?
问题描述：
当我在viewDidLoad中运行该应用程序时，我需要检查用户是否之前登录过.
When I run the app in viewDidLoad I need to check if user was logged in before or not.
if FBSDKAccessToken.currentAccessToken() != nil {
print("1")
presentViewController(controller, animated: true, completion: nil)
} else {
print("2")
let button = FBSDKLoginButton()
button.delegate = self
button.readPermissions = ["public_profile", "user_friends"]
view.addSubview(button)
}
它总是打印"2".为什么?
答
在AppDelegate中必须实现的两种方法必须:
Below two methods must be implemented in AppDelegate:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
}
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
}