UIPickerViewDelegate Xcode 8 Swift 3

我的代码是：

class ViewController: UIViewController,UIPickerViewDelegate, UIPickerViewDataSource {
    @IBOutlet weak var picherview: UIPickerView!

    var prodotti = ["AAAAA", "VVVV", "CCCC"]

    override func viewDidLoad() {
        super.viewDidLoad()
        self.picherview.dataSource = self
        self.picherview.delegate = self
        // Do any additional setup after loading the view, typically from a nib.
    }

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

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

    func pickerview( _ : UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return prodotti.count
    }

    func pickerview( _ : UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return prodotti[row]
    }     //ci consente di determinare quale riga è stata selezionata

    func pickerview(_ : UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        print("Hai selezionato: \(prodotti[row])")}
    }

此代码有错误：

类型“ViewController”不符合协议“UIPickerViewDataSource”

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任何解决方案？

正确的PickerView语法Swift 3

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

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

}

// Delegate

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

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

}

---

Swift 3中带完成按钮的PickerView完整示例

首先，在swift 3中创建一个单视图应用程序。拖动文本字段并连接到视图控制器

在两个名为UIPickerViewDelegate、UIPickerViewDataSource的PickerView协议中实现

UIPickerViewDelegate&UIPickerViewDataSource需要实现numberOfComponents、numberOfRowsInComponent、titleForRow等方法

选择器视图如下图所示

下面给出了完整的源代码

 class ViewController:UIViewController,UIPickerViewDelegate,UIPickerViewDataSource {
//Text field Connect
 @IBOutlet weak var txtPickerTextField: UITextField!
//Array declare
 let pickerArray = ["Bangladesh","India","Pakistan","USA"]
var selectedRow = 0;
//Picker View Object
let picker = UIPickerView()

  override func viewDidLoad() {
   super.viewDidLoad()
   //Don't forget to initialize pickerview delegate & datasource
   picker.delegate = self
    picker.dataSource = self
   txtPickerTextField.inputView = picker
   //Done Button function called
    doneButton();
 }
   public func numberOfComponents(in pickerView:  UIPickerView) -> Int  {
    return 1
  }

     func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
     return pickerArray.count
    }

    public func pickerView(_pickerView:UIPickerView,numberOfRowsInComponent component: Int) -> Int {
         return pickerArray.count
     }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
      return pickerArray[row]
    }
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
       selectedRow = row;
       txtPickerTextField.text = pickerArray[row]
       self.view.endEditing(false)
     }

     //begin  Doen Button function
    func doneButton(){

     let pickerView = picker
     pickerView.backgroundColor = .white
     pickerView.showsSelectionIndicator = true

     var toolBar = UIToolbar()
     toolBar.barStyle = UIBarStyle.default
     toolBar.isTranslucent = true
     toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
   toolBar.sizeToFit()

        let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: "donePicker")
       let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
       let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.bordered, target: self, action: "canclePicker")

       toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
       toolBar.isUserInteractionEnabled = true

       txtPickerTextField.inputView = pickerView
       txtPickerTextField.inputAccessoryView = toolBar
      }


   func donePicker() {
    self.txtPickerTextField.text = pickerArray[selectedRow]
    txtPickerTextField.resignFirstResponder()
     }

      func canclePicker() {
         txtPickerTextField.resignFirstResponder()
        }
          //End  Doen Button function
         }

完整的项目将提交给Github。Github链接：

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查看

UIPickerViewDataSource

和

UIPickerViewDelegate

的文档。Swift 3中的所有方法都已更改。