UIPickerViewDelegate Xcode 8 Swift 3

Question

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”

有什么办法吗？

Answer 1

PickerView 的正确语法 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) {

}

Answer 2

Swift 3 中带有完成按钮的 PickerView 完整示例

1. 首先，在 swift 中创建一个单视图应用程序 3. 拖动一个文本字段并连接到视图控制器。
2. 在两个 PickerView 协议中实现名为 UIPickerViewDelegate,UIPickerViewDataSource
3. UIPickerViewDelegate & UIPickerViewDataSource 需要实现 numberOfComponents,numberOfRowsInComponent,titleForRow 等方法
4. 选择器视图如下图所示

5. 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
            }
   

6. 完整的项目已提供给 Github。 Github链接：https://github.com/enamul95/PickerView1.git