swift - Swift 3 上的 UIPickerView

Question

我在使用 UIPickerView 时遇到错误

SelectViewController.swift:35:10: Method 'pickerView(pickerView:numberOfRowsInComponent:)' has different argument names from those required by protocol 'UIPickerViewDataSource' ('pickerView(_:numberOfRowsInComponent:)')

我在 Storyboard 上设置了 UIPickerView 并将其附加到 songPicker 变量。

然后我认为我集成了必要的功能，但它显示了这样的错误。

我发现 picker View 的结构在 swift 版本上发生了变化。

但是还没有找到正确的答案。

我的swift是3.1

有人帮我吗？

class SelectViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate{

    @IBOutlet weak var songPicker: UIPickerView!

    let songNames = ["test","test2"]

    override func viewDidLoad(){
            songPicker.delegate = self
          songPicker.dataSource = self

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


    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return songNames.count
    }
    func pickerView(pickerView: UIPickerView, titleForRow row: Int) -> String? {
        return songNames[row]
    }
    override func didReceiveMemoryWarning() {

    }
}

Answer 1

试试这段代码

class ElibraryViewController: UIViewController, UIPickerViewDelegate,UIPickerViewDataSource {

@IBOutlet weak var txtTitle: UITextField!
 @IBOutlet weak var Picker: UIPickerView!
let songNames = ["test","test2"]

override func viewDidLoad()
    {

        super.viewDidLoad()


            }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
    {


            return songNames[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
    {



        let obj = songNames[row]
        txtTitle.text = obj



    }

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

        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
    {



        return songNames.count



    }
override func didReceiveMemoryWarning() {

    }
}