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所以我试图将 GMSPlace 数据从 GooglePlaces 传递到 UIView，然后从 UIView 传递到 Firebase。我可以将它传递给 UIView 中的字符串（“文本文本...（值）...文本文本”），但是我想在用户按下确认按钮后再次将值传递给 Firebase（所以不是来自 UIView 的整个文本字符串。当我点击“确认”按钮时，我的应用程序崩溃了。感谢所有帮助！

// MARK: GOOGLE AUTO COMPLETE DELEGATE

func viewController(_ viewController: GMSAutocompleteViewController, didAutocompleteWith place: GMSPlace) {

    let placeID = place.placeID

    placesClient.lookUpPlaceID(placeID, callback: { (place, error) -> Void in
        if let error = error {
            print("lookup place id query error: \(error.localizedDescription)")
            return
        }

        guard let place = place else {
            print("No place details for \(placeID)")
            return
        }
        print("Place name \(place.name)")
        print("Place address \(place.formattedAddress)")
        print("Place placeID \(place.placeID)")
        print("Place attributions \(place.attributions)")
    })

    let selectedPlace = place.formattedAddress
    if let name = selectedPlace as String!
    {
        self.placeNameLabel.text = "Are you sure you would like to add \(name) to your places?"
    }
    self.dismiss(animated: true, completion: nil)
    setupConfirmationPopUp()   
}

// user taps button to send item to be updated in Firebase data tree
func confirmAddPlace(place: GMSPlace) {

    // add place to tableview array
    let accessToken = FBSDKAccessToken.current()
    guard let accessTokenString = accessToken?.tokenString else { return }

    let credentials = FIRFacebookAuthProvider.credential(withAccessToken: accessTokenString)
    FIRAuth.auth()?.signIn(with: credentials, completion: { (user, error) in
        if error != nil {
            print("Something went wrong with our FB user: ", error ?? "")
            return
    }

        // create place on tap pf confirm
        let ref = FIRDatabase.database().reference().child("places")
        let childRef = ref.childByAutoId()
        let values = ["place": place.formattedAddress, "name": user!.displayName]
        childRef.updateChildValues(values)
})

    animateOut()
}
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