我的数据似乎没有传递到新的 View Controller 。 事实上，它仅在登录后在(第一个) View Controller 中工作。 我相信我的工作中存在一些错误。 请告诉我哪里错了，我是初学者，所以请准确而高效。非常感谢。
class ViewController: UIViewController, FBSDKLoginButtonDelegate
{
override func viewDidLoad()
{
super.viewDidLoad()
if FBSDKAccessToken.currentAccessToken() != nil {
//user already has access token
self.logUserData()
} else {
loginButton.readPermissions = ["public_profile", "email", "user_friends"]
loginButton.delegate = self
self.Photo.image = UIImage(named: "Why subtle bckd image1")
self.Photo2.image = UIImage(named: "Un combo unique pict")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: PR/VAR
var firstName: String!
var lastName: String!
var email: String!
@IBOutlet var loginButton: FBSDKLoginButton!
@IBAction func loginButtonsend(sender: UIButton) {
sender.setTitle("firstName", forState: UIControlState.Normal)
sender.setTitle("lastName", forState: UIControlState.Normal)
sender.setTitle("email", forState: UIControlState.Normal)
}
@IBOutlet var Photo: UIImageView!
@IBOutlet var Photo2: UIImageView!
// MARK: FACEBOOK LOGIN
override func viewWillAppear(animated: Bool) {
self.logUserData()
}
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!)
{ if error == nil {
let fbAccessToken = FBSDKAccessToken.currentAccessToken().tokenString
println("Logged in")
} else { println(error.localizedDescription) } }
func loginButtonDidLogOut(loginButton: FBSDKLoginButton!)
{
println("User logged out.")
}
func logUserData()
{
let graphRequest = FBSDKGraphRequest(graphPath: "me?fields=id,email,first_name,last_name", parameters: ["fields": "first_name,email,last_name"])
graphRequest.startWithCompletionHandler { (connection, result, error) -> Void in
if error != nil
{
// Process error
println(error)
}
else
{
println(result.grantedPermissions)
println("fetched user = \(result)")
var firstName = result.valueForKey("first_name")
println("firstName = \(firstName)")
var lastName = result.valueForKey("last_name")
println("lastName is = \(lastName)")
var email = result.valueForKey("email")
println("email is = \(email)")
self.performSegueWithIdentifier("showNew", sender: self)
}
}
}
// SEGUE:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "showNew") {
if let destinationVC = segue.destinationViewController as? NewViewController {
destinationVC.firstName = firstName
destinationVC.lastName = lastName
destinationVC.email = email
}
}
}
}
在我的新 View Controller 中，我有以下内容:
class NewViewController: UIViewController {
var firstName: String!
var lastName: String!
var email: String!
@IBOutlet var firstNameLabel: UILabel!
@IBOutlet var lastNameLabel: UILabel!
@IBOutlet var emailLabel: UILabel!
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
if (firstName != nil) {
firstNameLabel.text = firstName
}
if (lastName != nil) {
lastNameLabel.text = lastName
}
if (email != nil) {
emailLabel.text = email
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func logoutButtonTapped(sender: AnyObject) {
let loginManager = FBSDKLoginManager ()
loginManager.logOut()
let loginPage = self.storyboard?.instantiateViewControllerWithIdentifier("ViewController") as ViewController
//?
let loginPageNav = UINavigationController (rootViewController: loginPage)
let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
appDelegate.window?.rootViewController = loginPageNav
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
最佳答案
似乎您从未在 ViewController 中设置变量，而是创建了三个与您应该在 logUserData 上使用的变量同名的变量。只需更改为:
println(result.grantedPermissions)
println("fetched user = \(result)")
firstName = result.valueForKey("first_name")
println("firstName = \(firstName)")
lastName = result.valueForKey("last_name")
println("lastName is = \(lastName)")
email = result.valueForKey("email")
println("email is = \(email)")
关于ios - Facebook SDK swift : problems with fetching user data (segue)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33237112/