最初的ViewController,LoginViewController.swift:
import UIKit
class LoginViewController: UIViewController, FBSDKLoginButtonDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do view setup here.
if (FBSDKAccessToken.currentAccessToken() != nil)
{
// User is already logged in, do work such as go to next view controller.
performSegueWithIdentifier("loginSegue", sender: nil)
print("segued due to login")
}
else
{
let loginView : FBSDKLoginButton = FBSDKLoginButton()
self.view.addSubview(loginView)
loginView.center = self.view.center
loginView.readPermissions = ["public_profile", "user_friends"]
loginView.delegate = self
}
}
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
print("User Logged 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
performSegueWithIdentifier("loginSegue", sender: nil)
/*
if result.grantedPermissions.contains("email")
{
// Do work
}
*/
}
}
func loginButtonDidLogOut(loginButton: FBSDKLoginButton!) {
print("User Logged Out")
}
}
"由于登录而被扰乱"每次启动应用程序时都会打印到终端,因此显然会到达if语句,还有performSegueWithIdentifier()行。但是,实际上并没有执行segue,因为LoginViewController停留在屏幕上,并且不显示下一个ViewController。我也试过添加这一行:
performSegueWithIdentifier("loginSegue", sender: nil)
在其他几个地方,我知道程序正在到达,就像在super.viewDidLoad()之后。所以,这个问题似乎是针对segue的,而问题似乎与Facebook的登录无关。
我已经在故事板的屏幕截图中加入了segue的属性:
如果需要,我可以包含任何其他文件。我也怀疑它可能是一个类似的类型错误this stackoverflow problem.我试图在我的所有ViewControllers中删除我的UITextViews中的占位符,但这并没有解决问题。
答案 0 :(得分:3)
好的,这就是你的应用程序:didFinishLaunching:withOptions应该是这样的。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
let mainStoryboard = UIStoryboard.init(name: "Main", bundle: nil)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
var initialViewController: UIViewController
if(FBSDKAccessToken.currentAccessToken() != nil){
let vc = mainStoryboard.instantiateViewControllerWithIdentifier("someOtherViewController") as! SomeOtherViewController
initialViewController = vc
}else{
initialViewController = mainStoryboard.instantiateViewControllerWithIdentifier("loginViewController")
}
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}