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’

有解决办法吗？

Answer 1

PickerView Swift 3的正确语法

// 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中完成按钮的PickerView示例

1. 首先，在Swive3中创建一个视图应用程序。拖动一个文本字段&连接到视图控制器。
2. 在两个PickerView协议UIPickerViewDelegate，UIPickerViewDataSource中实现
3. UIPickerViewDelegate & UIPickerViewDataSource需要实现numberOfComponents、numberOfRowsInComponent、titleForRow等方法
4. 选择器视图如下所示

​

1. 全源给出如下 类查看控制器:UIViewController，UIPickerViewDelegate，UIPickerViewDataSource { //Text field Connect @IBOutlet弱var txtPickerTextField: UITextField！//Array声明让pickerArray =“孟加拉国”、“印度”、“巴基斯坦”、“美国”var selectedRow = 0；// pickerview对象让called = UIPickerView()覆盖func viewDidLoad() { super.viewDidLoad() //不要忘记初始化泡菜视图委托& datasource picker.delegate = self picker.dataSource = self txtPickerTextField.inputView =self txtPickerTextField.inputView=self txtPickerTextField.inputView//Don函数(doneButton())；} public func numberOfComponents(in pickerView: UIPickerView) -> Int {返回1} func pickerView(_ pickerView: UIPickerView，numberOfRowsInComponent component: Int) -> Int {返回pickerArray.count } public func pickerView(_pickerView:UIPickerView，numberOfRowsInComponent component: Int) -> Int {返回pickerArray.count } func pickerView(_ pickerView: pickerArray.count，row: Int，forComponent组件: Int) ->字符串？{返回pickerArrayrow } func pickerView(_ pickerView: UIPickerView，didSelectRow行: Int，inComponent组件: Int) { selectedRow = row；txtPickerTextField.text = pickerArrayrow self.view.endEditing(false) } //begin Doen Button函数func doneButton(){ let pickerView =UIColor pickerView.backgroundColor = .white pickerView.showsSelectionIndicator = true var toolBar = UIToolbar() toolBar.barStyle = UIBarStyle.default toolBar.isTranslucent = true toolBar.tintColor =UIColor(红色: 76/255，绿色: 217/255，蓝色: 100/255，阿尔法: 1) toolBar.sizeToFit()让doneButton =UIBarButtonItem(标题：“完成”，样式: UIBarButtonItemStyle.bordered，目标:自我，动作："donePicker")让spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace，目标:0，action: 0)让cancelButton =UIBarButtonItem(标题：“取消”，样式: UIBarButtonItemStyle.bordered，目标:自我，动作："canclePicker") toolBar.setItems(cancelButton，spaceButton，doneButton )动画: toolBar.isUserInteractionEnabled = true txtPickerTextField.inputView = pickerView txtPickerTextField.inputAccessoryView = toolBar } func donePicker() { self.txtPickerTextField.text = pickerArrayselectedRow txtPickerTextField.resignFirstResponder() } func canclePicker() { txtPickerTextField.resignFirstResponder() } //End Doen Button函数}
2. 完整的项目是给吉特卜的。Github链接：https://github.com/enamul95/PickerView1.git