Swift/iOS:ui以编程方式更改数据源后点击,才会刷新选择器显示

在我的应用程序中,我有一个选择器,在POST请求后,它会填充来自我服务器的数据。

运行时,屏幕上似乎什么也没有发生,选择器没有改变。但一旦点击,新数据就会立即出现,并正常工作。看起来数据源更改工作正常,但直到刷新后显示才会更改。

有没有办法刷新它,或者有其他方法来更改数据源

以下是相关代码:

class MyController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

@IBOutlet weak var dossiers_picker: UIPickerView!
var pickerData: [Dossier] = [Dossier(nom: "Dossier", id: 0)]
// Dossier is just a tuple class with 2 attributes

override func viewDidLoad() {
    super.viewDidLoad()
    self.dossiers_picker.delegate = self
    self.dossiers_picker.dataSource = self
    getDossiers()
}

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerData.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return pickerData[row].nom
}

func getDossiers() {
    ... // Cut the code where I call the server to get the data, etc ...
    let task = session.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {
                // check for fundamental networking error
                print("error=\(String(describing: error))")
                return
            }
        ... // get the data and turn it into an array of Dossier classes in var dossiers
        self.pickerData = dossiers
        dossiers_picker.reloadAllComponents()
    }
    task.resume()
}
}