尝试将数据从 UIPicker 发送到 Firebase 数据库

Question

所以我想出了如何将文本字段数据发送到数据库，同时为每个客户的订单提供一个唯一的键，在下一个视图或下一个屏幕中，我需要限制客户所做的选择，所以我改为放置文本字段的 UIPicker 具有各种选项。我需要客户选择的选项也出现在我的数据库中，使用与上一屏幕中使用的密钥相同的密钥。

class flavorViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    var customerInfo: FIRDatabaseReference!
    @IBOutlet weak var flavorPicker: UIPickerView!

    var flavors: [String] = [String]()

    override func viewDidLoad() {
        super.viewDidLoad()
        FIRApp.configure()
        customerInfo = FIRDatabase.database().reference().child("Customer Info");

        self.flavorPicker.dataSource = self
        self.flavorPicker.delegate = self

        //List Picker Data Here
        flavors = ["Double Apple", "Watermelon Mint", "Blueberry Mint", "Grape Mint", "Geisha", "Sex on the Beach"]
    }

    // The number of columns of data
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    // The number of rows of data
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return flavors.count
    }

    // The data to return for the row and component (column) that's being passed in
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return flavors[row]
    }

    func flavorselected() {
        let key = customerInfo.childByAutoId().key

        let flavor = ["id": key,"flavor selected": flavorPicker.selectedRow as Int ]
    }

    @IBAction func checkoutButton(_ sender: Any) {
        flavorselected()
    }

这是我设置所有内容的所有代码，但是我收到错误消息：

Cannot convert value of type '(Int) -> Int' to type 'Int' in coercion

此外，虽然我还没有尝试过，但这个选择是否会与用户在前一屏幕中输入数据库的数据合并？或者它会创建一个单独的条目。

Answer 1

您的问题在这一行：

let flavor = ["id": key,"flavor selected": flavorPicker.selectedRow as Int ]

它是由以下原因引起的：

flavorPicker.selectedRow as Int

selectedRow 是一个带有 Int 参数的函数。您需要将其更改为：

let flavor: [String: Any] = ["id": key,"flavor selected": flavorPicker.selectedRow(inComponent: 0) ]

尝试将数据从 UIPicker 发送到 Firebase 数据库

Attempting to send data from a UIPicker to Firebase Database

ios

swift

firebase

uipickerview