一个多月以来，我一直在尝试使用 Swift 在我的应用程序中实现 Parse 的 Facebook 登录功能，但似乎无法弄清楚。我成功地将我的应用程序分别链接到 Facebook 和 Parse，但我无法使用 Facebook 的登录名创建 Parse 用户。我相信 AppDelegate 设置正确，所以我只会显示我的 LoginViewController，希望知道他们在做什么的人可以帮助我：
import UIKit
import Parse
import FBSDKCoreKit
import FBSDKLoginKit
protocol LoginViewControllerDelegate {
func onRegister(loginViewController : LoginViewController)
func onFacebookLogin(loginViewController : LoginViewController)
func onLogin(loginViewController : LoginViewController)
}
class LoginViewController: UIViewController, FBSDKLoginButtonDelegate {
//MARK: - Outlets
@IBOutlet weak var lblStatus: UILabel!
//var delegate : LoginViewControllerDelegate?
// Set permissions required from the facebook user account
let permissions = [ "user_about_me", "user_relationships", "user_location", "user_birthday", "public_profile", "user_friends", "user_email", "user_gender"]
//MARK: - Initial Load
override func viewDidLoad() {
super.viewDidLoad()
self.lblStatus.alpha = 0
//Facebook
if (FBSDKAccessToken.currentAccessToken() != nil)
{
// User is already logged in, do work such as go to next view controller.
}
else
{
let loginView : FBSDKLoginButton = FBSDKLoginButton()
// self.view.addSubview(loginView)
// loginView.center = self.view.center
// loginView.readPermissions = ["public_profile", "email", "user_friends"]
loginView.delegate = self
}
// ---------------------------- Check if user is logged in ---------------------
if PFUser.currentUser() != nil {
println("parse: User already logged in")
performSegueWithIdentifier("loggedIn", sender: self)
}
}
//MARK: - Facebook Login Button
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
if ((error) != nil) {
println(error) // Process error
} else if result.isCancelled { // Handle cancellations
} else {
// If you ask for multiple permissions at once, you
// should check if specific permissions missing
if result.grantedPermissions.contains("email")
{
// Do work
}
}
returnUserData()
}
@IBAction func facebookLoginDidPress(sender: AnyObject) {
self.lblStatus.alpha = 0
PFFacebookUtils.logInInBackgroundWithReadPermissions(self.permissions, block: {
(user: PFUser?, error: NSError?) -> Void in
if (user == nil) {
if (error == nil) {
println("User cancelled FB login")
self.lblStatus.alpha = 1
}else{
println("FB login error: \(error)")
self.lblStatus.alpha = 1
}
} else if user!.isNew {
println("User signed up and logged in with Facebook! \(user)")
self.requestFacebook()
self.returnUserData()
self.performSegueWithIdentifier("loggedIn", sender: self)
} else {
println("User logged in via Facebook \(user)")
self.performSegueWithIdentifier("loggedIn", sender: self)
}
})
}
func requestFacebook() {
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
println("Error: \(error)")
}
else if error == nil
{
var userData: NSDictionary = NSDictionary(objectsAndKeys: result)
var facebookID: AnyObject? = userData["id"]
var name: AnyObject? = userData["first_name"]
var gender: AnyObject? = userData["gender"]
var birthday: AnyObject? = userData["birthday"]
var pictureURL = "https://graph.facebook.com/\(facebookID)/picture?type=large&return_ssl_resources=1"
var URLRequest = NSURL(string: pictureURL)
var URLRequestNeeded = NSURLRequest(URL: URLRequest!)
NSURLConnection.sendAsynchronousRequest(URLRequestNeeded, queue: NSOperationQueue.mainQueue(), completionHandler: {(response: NSURLResponse!,data: NSData!, error: NSError!) -> Void in
if error == nil {
var picture = PFFile(data: data)
PFUser.currentUser()!.setObject(picture, forKey: "profilePicture")
PFUser.currentUser()!.saveInBackground()
}
else {
println("Error: \(error.localizedDescription)")
}
})
}
})
}
func loginButtonDidLogOut(loginButton: FBSDKLoginButton!) {
println("User Logged Out")
}
func returnUserData()
{
let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in
if ((error) != nil)
{
// Process error
println("Error: \(error)")
}
else
{
if let userName : NSString = result.valueForKey("name") as? NSString {
println("User Name is: \(userName)")
} else {println("No username fetched")}
if let userEmail : NSString = result.valueForKey("email") as? NSString {
println("User Email is: \(userEmail)")
} else {println("No email address fetched")}
if let userGender : NSString = result.valueForKey("gender") as? NSString {
println("User Gender is: \(userGender)")
} else {println("No gender fetched") }
}
})
}
}
一些重要的注意事项：
我正在使用最新版本的 Parse (1.7.4) 和 FBSDK (4.1)，所以我在网上找到的大多数其他方法不再起作用，因为从那时起某些功能或成员已被删除。
“func loginButton”是我用于 FBSDKLoginButton 的，而“@IBAction func facebookLoginDidPres”是我尝试用于登录的常规 UIButton。根据我最近学到的知识，我相信 UIButton 方法是我应该去，但那会导致 Thread 1: Signal SIGABRT 错误说明：
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“+[PFFacebookUtils logInInBackgroundWithReadPermissions:block:]：无法识别的选择器发送到类 0x10ed3ed80”*** 第一次抛出调用堆栈：
...
libc++abi.dylib：以 NSException (lldb) "" 类型的未捕获异常终止
所以我放置了一个异常断点，它在我的 IBAction 中的“logInInBackgroundWithReadPermissions”函数的末尾结束，控制台说明：
“[PFFacebookUtils logInInBackgroundWithReadPermissions:block:]: 无法识别的选择器发送到类 0x10dbe2db0 (lldb)”
- 我觉得值得一提的最后一个细节是，当我运行应用程序时，我的控制台显示“解析：用户已经登录”，但是当我检查 Parse 时没有创建用户。这是从我的 LogInViewController 的 viewDidLoad 函数的“检查用户是否登录”部分下的部分打印出来的。
我将永远感激任何能帮助我解决这个困扰我太久的问题的人。先感谢您！