Firebase setValue在IOS 10，Swift 3中不起作用

Question

嘗試將評論保存到Firebase時，我的應用程序崩潰了。 這段代碼在Xcode 8更新之前運行良好：

    func saveNewComment(){

    //get date
    let date = Date()
    let calendar = Calendar.current
    let components = (calendar as NSCalendar).components([.day,.month,.year], from: date)

    let year = components.year
    let month = components.month
    let day = components.day

    //format month
    let dateFormatter: DateFormatter = DateFormatter()
    let months = dateFormatter.shortMonthSymbols
    let monthSymbol = months?[month!-1]
    let todaysDate = "\(day) \(monthSymbol),\(year)"

    //trim comment
    let comment = textView.text
    let trimmedComment = comment?.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

    //save new comment
    let commentRef = ref.child("Stores").child(getRef!).child("CommentArray").childByAutoId()

    commentRef.setValue([

        "Comment": trimmedComment,
        "Date": todaysDate

    ])

    self.delegate?.commentSubmitted(true)//delegate
    self.dismiss(animated: true, completion: nil)//dismiss view

}

顯然錯誤是當我嘗試使用“ setValue”來設置那些鍵值對時。 任何想法為什么會這樣？

提前致謝。

Answer 1

確保getRef! 是正確的節點名稱，然后將todaysDate更改為

let todaysDate = "\(day!) \(monthSymbol!),\(year!)"

Answer 2

Firebase不接受optional類型作為值

let trimmedComment = comment?.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines) 

嘗試使用來包裝trimmedComment和todaysDate值!

commentRef.setValue([
        "Comment": trimmedComment!,
        "Date": todaysDate!
 ])