我有一个主页，用户必须使用Facebook登录才能登录。但是当我点击Facebook按钮时 - 它会将我引导至safari页面，它会自动退出并返回主屏幕。
我尝试了所有教程并更改了代码。但对我来说没有任何作用。请帮帮我 - 为什么会这样？
import UIKit
import FBSDKCoreKit
import FBSDKLoginKit
class LoginViewController: UIViewController, UIAlertViewDelegate, GIDSignInDelegate, GIDSignInUIDelegate
{
@IBOutlet weak var UsernameEmailTextField: UITextField? // init username/email text field
@IBOutlet weak var PasswordTextField: UITextField? // init password text field
@IBOutlet var FbLoginButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.barTintColor = UIColor.redColor()
self.navigationController?.navigationBar.tintColor = UIColor.whiteColor()
if (FBSDKAccessToken.currentAccessToken() != nil) {
// User is already logged in, do work such as go to next view controller.
print("User Already Logged In")
} else {
print("User Not Logged In")
}
let dismiss: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(LoginViewController.DismissKeyboard))
view.addGestureRecognizer(dismiss)
}
//keyboard dismiss function for input's
func DismissKeyboard() {
view.endEditing(true)
}
//facebook sign in
@IBAction func FbLoginButtonTapped(sender: AnyObject) {
let facebookLogin = FBSDKLoginManager()
facebookLogin.logInWithReadPermissions(["email","public_profile","user_location"], fromViewController:self, handler:{(facebookResult, facebookError) -> Void in
if facebookError != nil {
print("Facebook login failed. Error \(facebookError)")
} else if facebookResult.isCancelled {
print("Facebook login was cancelled.")
} else {
if((FBSDKAccessToken.currentAccessToken()) != nil) {
FBSDKGraphRequest(graphPath: "me",
parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email, user_location"]).startWithCompletionHandler({
(connection, result, error) -> Void in
if (error != nil) {
print(error)
} else {
let Email = result.valueForKey("email") as! String
let IdasPassword = result.valueForKey("id") as! String
self.MakeLogin(Email, SocialPassword: IdasPassword)
}
})
}
}
})
}
func MakeLogin(SocialEmail: String, SocialPassword: String) {
//Adding Headers
let headers = ["content-type": "application/x-www-form-urlencoded"]
//Concatenating the email/username field with postdata
let ConcatEmail = "email="+SocialEmail
//Concatenating the password field with postdata
let ConcatPassword = "&password="+SocialPassword
//assigning concatenated values in postData
let postData = NSMutableData(data: ConcatEmail.dataUsingEncoding(NSUTF8StringEncoding)!)
postData.appendData(ConcatPassword.dataUsingEncoding(NSUTF8StringEncoding)!)
//assigning request values
let request = NSMutableURLRequest(URL: NSURL(string: "http login url”)!)
//declaring POST Method
request.HTTPMethod = "POST"
//declaring header fields
request.allHTTPHeaderFields = headers
//Adding postData as HTTPBody
request.HTTPBody = postData
//declaring the session for url
let session = NSURLSession.sharedSession()
//assigning task to get response data
let task = session.dataTaskWithRequest(request, completionHandler: { (ResposeData, response, error) -> Void in
if(ResposeData != nil) {
//declaring completion handler to check whether login.
do {
if let jsonData = try NSJSONSerialization.JSONObjectWithData(ResposeData!, options: [] ) as? NSDictionary {
//assigning success jsonData
if let success = jsonData["success"] as? Int {
//If login success
if(success == 1) {
//assign access_token value from jsonData
let access_token = jsonData["token"]
// loading menu
dispatch_async(dispatch_get_main_queue()) {
let appdelegate:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
_ = appdelegate.window!.rootViewController
let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let mainViewController = mainStoryBoard.instantiateViewControllerWithIdentifier("HomeViewController") as! HomeViewController
let leftViewController = mainStoryBoard.instantiateViewControllerWithIdentifier("MenuViewController") as! MenuViewController
let leftSideNav = UINavigationController(rootViewController: leftViewController)
let centerNav = UINavigationController(rootViewController: mainViewController)
let centerContainer:MMDrawerController = MMDrawerController(centerViewController: centerNav, leftDrawerViewController: leftSideNav)
centerContainer.openDrawerGestureModeMask = MMOpenDrawerGestureMode.PanningCenterView;
centerContainer.closeDrawerGestureModeMask = MMCloseDrawerGestureMode.PanningCenterView;
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "ISSOCIALLOGGEDIN")
NSUserDefaults.standardUserDefaults().setValue(access_token, forKey: "access_token")
NSUserDefaults.standardUserDefaults().synchronize()
appdelegate.centerContainer = centerContainer
appdelegate.window!.rootViewController = appdelegate.centerContainer
appdelegate.window!.makeKeyAndVisible()
}
//dismissing the current view
self.dismissViewControllerAnimated(true, completion: nil)
} else {
let ServerMessage = jsonData["message"] as? String
print(ServerMessage)
dispatch_async(dispatch_get_main_queue(), {
let alert = UIAlertController(title: "Error", message: ServerMessage, preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(alert, animated: true, completion: nil)
})
}
}
} else {
let jsonStr = NSString(data: ResposeData!, encoding: NSUTF8StringEncoding)
// No error thrown, but not NSDictionary
print("Error could not parse JSON: \(jsonStr)")
}
} catch let parseError {
print(parseError)
// Log the error thrown by `JSONObjectWithData`
let jsonStr = NSString(data: ResposeData!, encoding: NSUTF8StringEncoding)
print("Error could not parse JSON: '\(jsonStr)'")
dispatch_async(dispatch_get_main_queue(), {
let alert = UIAlertController(title: "Error", message: "No Data Received, Please contact Admin/Dev", preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(alert, animated: true, completion: nil)
})
}
} else {
print("Error: No Response Data")
dispatch_async(dispatch_get_main_queue(), {
let alert = UIAlertController(title: "Invalid Username or Password", message: "No Response from server, You might be facing internet failure or try with different values", preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(alert, animated: true, completion: nil)
})
}
})
task.resume()
}
}
答案 0 :(得分：0)
首先，我假设您的项目中有最新版本的Facebook SDK。首先，完成Facebook开发人员网站上提到的有关SDK安装的所有步骤，
This会帮助您，以防您无法将Objective-C代码转换为Swift。
继续前进，您可以在yourViewController中实现func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!)中的功能，以了解用户按下登录按钮时发生的情况，如下所示：
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
if (error != nil) {
print(error.localizedDescription)
} else if result.isCancelled {
print("User Cancelled The Login")
} else {
if result.grantedPermissions.contains("email") {
print("Got email access")
}
}
}
只要您获得电子邮件访问权限，就可以调用其他功能来获取您要求的用户详细信息;那是怎么回事：
func graphRequestToReturnUserData(graphParameters: Dictionary<String, String>) {
let graphRequest: FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: graphParameters)
graphRequest.startWithCompletionHandler({
(connection, result, error) -> Void in
if ((error) != nil) {
print("Error: \(error.localizedDescription)") //Error Handling
} else {
self.facebookD = result as! NSDictionary
}
})
}
当SDK中已经存在所有内容时，创建自己的按钮然后查找详细信息并不是一个好方法。 除此之外，您还需要提及所需的权限。