Ios 点击字段时未在UIPickerView中填充数据

我试图学习如何以编程方式将数据填充到UIPickerView中，而不是将选择器作为主情节提要上的元素。我正在一个项目中练习，这样当我完成这项工作时，我就可以将代码复制到我实际上正在开发的项目中。到目前为止，当我点击季节字段时，屏幕底部会出现一个灰色选择器，但其中没有数据。我有一种感觉，这是因为我尝试填充数据的方式，这是我从将数据填充到选择器视图的教程中获得的，但该教程在主情节提要上有一个选择器元素。我能知道这方面的方向吗？多谢各位

class ViewController: UIViewController, UIPickerViewDelegate {

@IBOutlet var enterSeason: UITextField!

var dataPickerView = UIPickerView()
var season = ["2013", "2014", "2015"] //multi-season
//var season = ["2015"] //single-season

override func viewDidLoad() {
    super.viewDidLoad()

    enterSeason.inputView = dataPickerView
    //enterSeason.inputView = UIPickerView()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return season.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return season[row] as String
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    var itemSelected = season[row] as String
    self.enterSeason.text  = itemSelected
}
}

---

如果希望以编程方式获取数据，则需要再设置一个协议：UIPickerViewDataSource

第一行应更改为：

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

---

ViewController实现了

UIPickerViewDeleteGate

和

UIPickerViewDataSource

方法，但需要将ViewController设置为

UIPickerView

的委托和数据源

将此代码添加到

viewDidLoad

：

dataPickerView.delegate = self
dataPickerView.dataSource = self

并让您的ViewController类通过更改

class ViewController: UIViewController, UIPickerViewDelegate

到

---

记住，必须将类设置为委托/数据源，以符合协议方法。UITableView、UICollectionView等也是如此

这是所有这些信息的总和：

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet var enterSeason: UITextField!

    var dataPickerView = UIPickerView()
    var season = ["2013", "2014", "2015"] //multi-season
    //var season = ["2015"] //single-season

    override func viewDidLoad() {
        super.viewDidLoad()

        enterSeason.inputView = dataPickerView
        dataPickerView.delegate = self
        dataPickerView.dataSource = self
        //enterSeason.inputView = UIPickerView()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return season.count
    }
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return season[row] as String
    }
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        var itemSelected = season[row] as String
        self.enterSeason.text  = itemSelected
    }
    }

---

您是否设置了数据源和委托

dataPickerView.dataSource=self

dataPickerView.delegate=self

@Audrey感谢您的回复。我想我已经照你说的做了。我添加了UIPickerViewDataSource，例如

类ViewController:UIViewController、UIPickerViewDelegate、UIPickerViewDataSource

@Audrey当我点击字段时，我仍然只得到没有数据的灰色选择器。@Greg我的输入，只是拼图的一半。很高兴它终于对你起作用了。继续学习！非常感谢。那是丢失的一块。我已经将UIPickerViewDataSource添加到类中，但需要.delegate和.dataSource代码。我一直在学习新东西。

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet var enterSeason: UITextField!

    var dataPickerView = UIPickerView()
    var season = ["2013", "2014", "2015"] //multi-season
    //var season = ["2015"] //single-season

    override func viewDidLoad() {
        super.viewDidLoad()

        enterSeason.inputView = dataPickerView
        dataPickerView.delegate = self
        dataPickerView.dataSource = self
        //enterSeason.inputView = UIPickerView()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return season.count
    }
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return season[row] as String
    }
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        var itemSelected = season[row] as String
        self.enterSeason.text  = itemSelected
    }
    }