描述/问题
我使用Firebase作为我的数据库，并使用Facebook登录作为我的登录方法。我已按照Firebase和Facebook上的文档进行操作，但遇到了问题。当我尝试登录时，收到以下错误消息：
“第1行：EXC_BAD_INSTRUCTION（代码= EXC_I386_INVOP，子代码= 0x0）”行let credential = FIRFacebookAuthProvider.credential(withAccessToken: FBSDKAccessToken.current().tokenString)
我做错了什么？我点击Facebook登录按钮后立即发生错误。
代码
import UIKit
import FBSDKLoginKit
import FirebaseAuth
class ViewController: UIViewController, FBSDKLoginButtonDelegate {
var loginButton = FBSDKLoginButton()
override func viewDidLoad() {
super.viewDidLoad()
// Optional: Place the button in the center of your view.
self.loginButton.center = self.view.center
self.loginButton.readPermissions = ["public_profile", "email", "user_friends"]
self.loginButton.delegate = self
self.view.addSubview(loginButton)
//Create label with text and position
let label = UILabel(frame: CGRect(x: self.view.bounds.width / 2 - 100, y: self.view.bounds.height / 2 - 100, width: 200, height: 100))
label.text = "Drag me!"
label.textAlignment = NSTextAlignment.center
self.view.addSubview(label)
//Gesture recognition
let gesture = UIPanGestureRecognizer(target: self, action: #selector(wasDragged(gesture:)))
label.addGestureRecognizer(gesture)
label.isUserInteractionEnabled = true
}
// Gesture transition
func wasDragged(gesture: UIPanGestureRecognizer) {
let translation = gesture.translation(in: view) //self.view
let label = gesture.view!
label.center = CGPoint(x: self.view.bounds.width / 2 + translation.x, y: self.view.bounds.height / 2 + translation.y)
let xFromCenter = label.center.x - self.view.bounds.width / 2
let scale = min(100 / abs(xFromCenter), 1)
var rotation = CGAffineTransform(rotationAngle: xFromCenter / 200)
var stretchAndRotation = rotation.scaledBy(x: scale, y: scale)
label.transform = stretchAndRotation
if gesture.state == UIGestureRecognizerState.ended {
if label.center.x < 100 {
print("Not chosen")
} else if label.center.x > self.view.bounds.width - 100 {
print("Chosen")
}
rotation = CGAffineTransform(rotationAngle: 0)
stretchAndRotation = rotation.scaledBy(x: 1, y: 1)
label.transform = stretchAndRotation
label.center = CGPoint(x: self.view.bounds.width / 2, y: self.view.bounds.height / 2)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//
func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
print("User Logged In")
let credential = FIRFacebookAuthProvider.credential(withAccessToken: FBSDKAccessToken.current().tokenString)
FIRAuth.auth()?.signIn(with: credential) { (user, error) in
print("User Logged Into Firebase App")
}
}
func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
print("User Did Logout")
}
}