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我對編程頗爲陌生，所以請耐心等待。我有Facebook SDK的signIn/signUp功能。當用戶註冊時，我在profilePageViewController上顯示用戶的名字，姓氏和個人資料圖片。但是，當用戶離開應用程序，並去這個viewController所有標籤和imageView（這裏我實際顯示文件從資產）是空白的。我爲這種情況提供了NSUserDefaults，但不知道如何實現它。你可以在底部找到NSUserDefaults的代碼，這個代碼是我在網上瀏覽的，但是不知道該把它放在哪裏以及如何調用它，也不確定我的代碼對我的情況是否準確。現在它甚至沒有被稱爲。感謝您的幫助和建議NSUserDefaults與Facebook登錄
import Foundation
import UIKit
import Parse
class ProfilePageViewController: UITableViewController, FBSDKLoginButtonDelegate {
@IBAction func userBeenHereButton(sender: AnyObject) {
}
@IBOutlet weak var userWantToGoButton: UIButton!
@IBOutlet var profilePageTableView: UITableView!
@IBOutlet weak var firstNameLabel: UILabel!
@IBOutlet weak var lastNameLabel: UILabel!
@IBOutlet weak var profilePictureImageView: UIImageView!
let loginButton: FBSDKLoginButton = {
let button = FBSDKLoginButton()
button.readPermissions = ["email"]
return button
}()
override func viewDidLoad() {
super.viewDidLoad()
self.firstNameLabel.text = ""
self.lastNameLabel.text = ""
self.profilePictureImageView?.image
view.addSubview(loginButton)
loginButton.center = view.center
loginButton.delegate = self
if let token = FBSDKAccessToken.currentAccessToken() {
fetchProfile()
}
}
func fetchProfile() {
print("func fetch profile was called")
let parameters = ["fields": "email, first_name, last_name, picture.type(large)"]
FBSDKGraphRequest(graphPath: "me", parameters: parameters).startWithCompletionHandler { (connection, result, error) -> Void in
if error != nil {
print(error)
return
}
var firstNameData = ""
var lastNameData = ""
var emailData = ""
var pictureData = ""
if let firstName = result.valueForKey("first_name") as? String {
print(firstName)
firstNameData = firstName
}
if let lastName = result.valueForKey("last_name") as? String {
print(lastName)
lastNameData = lastName
}
if let email = result.valueForKey("email") as? String {
print(email)
emailData = email
}
if let picture = result.valueForKey("picture")as? NSDictionary,
data = picture["data"] as? NSDictionary,
url = data["url"] as? String {
print(url)
pictureData = url
}
let user = PFUser()
let username = "\(firstNameData)_\(lastNameData)"
user["firstName"] = firstNameData
user["lastName"] = lastNameData
user["email"] = emailData
user["picture"] = pictureData
user["username"] = username
user["password"] = emailData
let currentUser = PFUser.currentUser()?.username
if currentUser == nil {
user.signUpInBackgroundWithBlock() {(success, error) -> Void in
if success {
print("successfully saved")
} else {
do
{
try PFUser.logInWithUsername(username, password: emailData)
}
catch
{
print(error)
}
self.updateUI()
print("profile should not be blank")
}
}
}
}
}
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
print("complete login")
fetchProfile()
nsUserDefaults()
}
func loginButtonDidLogOut(loginButton: FBSDKLoginButton!) {
print("successfully logged out")
PFUser.logOut()
self.firstNameLabel.text = ""
self.lastNameLabel.text = ""
self.profilePictureImageView?.image = UIImage(named: "user.png")
}
func loginButtonWillLogin(loginButton: FBSDKLoginButton!) -> Bool {
return true
}
func updateUI() {
if let userFirstName = PFUser.currentUser()?["firstName"] as? String {
firstNameLabel.text = userFirstName
} else {
self.firstNameLabel.text = ""
}
if let userLastName = PFUser.currentUser()?["lastName"] as? String {
lastNameLabel.text = userLastName
} else {
self.lastNameLabel.text = ""
}
if let userPicture = PFUser.currentUser()?["picture"] as? String,
url = NSURL(string: userPicture),
data = NSData(contentsOfURL: url),
image = UIImage(data: data)
{
profilePictureImageView?.image = image
}
else {
self.profilePictureImageView.image = nil
}
}
func nsUserDefaults(){
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(self.firstNameLabel.text, forKey: "firstName")
defaults.setObject(self.lastNameLabel.text, forKey: "lastName")
if let imageData = defaults.objectForKey("picture") as? NSData {
if let image = UIImage(data: imageData) {
self.profilePictureImageView.image = image
defaults.removeObjectForKey("picture")
defaults.synchronize()
print("NSUser")
}
}
}