问题
I added FBSDK 4.7 to my swift app and when it opens the safari view controller to login, and I try to tap "Done" without inputting anything into the email/password fields, the app breaks. It spits out "fatal error: unexpectedly found nil while unwrapping an Optional value"
How do I handle this error?
Current login code:
if let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager(){
fbLoginManager.logInWithReadPermissions(["email"],fromViewController:self,
handler:{(result:FBSDKLoginManagerLoginResult!,error:NSError!) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if(fbloginresult.grantedPermissions.contains("email"))
{
print("Logged in successfully")
self.getFBUserData()
//fbLoginManager.logOut()
}
}
else{
print("HELPPPPPPPPPP")
}
})
}
回答1:
No need to assign the types of variable (result, error)
:
Here is working code with Facebook 4.7 SDK | Swift 2 | Xcode 7.
@IBAction func btnFBLoginPressed(sender: AnyObject) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager.loginBehavior = FBSDKLoginBehavior.Web
fbLoginManager.logInWithReadPermissions(["email"], fromViewController: self, handler: { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if fbloginresult.grantedPermissions != nil { //Here we have to check that the set contains value or not
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
fbLoginManager.logOut()
}
}
}
})
}
func getFBUserData(){
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
print(result)
}
})
}
}
We have to check the grantedPermissions
's Set
is nil
or not.
if fbloginresult.grantedPermissions != nil { //Here we have to check that the set contains value or not
来源:https://stackoverflow.com/questions/33208026/facebook-sdk-4-7-login-error-handling