Facebook Swift SDK：loginManager表达式类型不明确错误

Question

I'm using the following code to add a facebook login to a UIButton action:

func facebookButtonClicked(sender: UIButton) {
    let loginManager = LoginManager()

    loginManager.logIn([.PublicProfile], viewController : self) { loginResult in
        switch loginResult {
            case .Failed(let error):
                print(error)
            case .Cancelled:
                print("User cancelled login")
            case .Success(let grantedPermissions, let declinedPermissions, let accessToken):
                print("Logged in")
        }
    }
}

Xcode is throwing the following error:

Type of expression is ambiguous without more context

for the [.PublicProfile] part.

Any ideas what I'm doing wrong here?

Answer 1

The final solution is this one:

 let loginManager=LoginManager()
    loginManager.logIn(readPermissions: [ReadPermission.publicProfile], viewController : self) { loginResult in
        switch loginResult {
        case .failed(let error):
            print(error)
        case .cancelled:
            print("User cancelled login")
        case .success(let grantedPermissions, let declinedPermissions, let accessToken):
            print("Logged in")
        }
    }

Facebook hasn't updated its own codes' examples...

Answer 2

Try this for latest SDK

func facebookButtonClicked(sender: UIButton) {
    let loginManager = LoginManager()

    loginManager.logIn(readPermissions: [.publicProfile], viewController : self) { loginResult in
        switch loginResult {
            case .failed(let error):
                print(error)
            case .cancelled:
                print("User cancelled login")
            case .success(let grantedPermissions, let declinedPermissions, let accessToken):
                print("Logged in")
        }
    }
}

Answer 3

你应该在第一个参数之前添加readPermissons：

loginManager.logIn(readPermissions: [ .publicProfile], ...

Answer 4

i recently resolved this error.

replace .publicProfile with ReadPermission.publicProfile

this should fix the problem.

Answer 5

So I somewhat fixed this issue by using the proper facebook syntax since the recent update.

 @IBAction func facebookBtnTapped(_ sender: AnyObject) { 

    let loginManager = LoginManager()
    loginManager.logIn([ .publicProfile ], viewController: self) { loginResult in
        switch loginResult {
        case .failed(let error):
            print(error)
        case .cancelled:
            print("User cancelled login.")
        case .success(let grantedPermissions, let declinedPermissions, let accessToken):
            print("Logged in!")
        }
    }

}

Answer 6

changing

viewController: self

to

viewController: nil

solved this issue for me

Answer 7

  @objc func loginButtonClicked(sender : UIButton) {
    let loginManager = LoginManager()

    loginManager.logIn(readPermissions: [.publicProfile], viewController : self) { loginResult in
      switch loginResult {
      case .failed(let error):
        print(error)
      case .cancelled:
        print("User cancelled login")
      case .success(let grantedPermissions, let declinedPermissions, let accessToken):
        print("Logged in")
      }
    }
      }

Answer 8

In Swift 4.2 and Xcode 10.1

If you want more permissions use this code.

@IBAction func onClickFBSign(_ sender: UIButton) {

    let loginManager=LoginManager()
    //Here in this line you need to mention permissions like .email, .userFriends, .userBirthday etc..
    loginManager.logIn(readPermissions: [ReadPermission.publicProfile, .email, .userFriends, .userBirthday], viewController : self) { loginResult in
        switch loginResult {
        case .failed(let error):
            print(error)
        case .cancelled:
            print("User cancelled login")
        case .success(let grantedPermissions, let declinedPermissions, let accessToken):
            print("Logged in : \(grantedPermissions), \(declinedPermissions), \(accessToken)")
        }
    }
}

https://developers.facebook.com/docs/swift/login