Swift不符合協議

Question

將使用Swift 6構建的應用程序拉到現在使用6測試版的系統後，我得到一個「EventFormViewController不符合協議UIPickerViewDataSource」。我已經掙扎了好幾天了，有什麼建議嗎？

import UIKit 

var eventChoices = [ 
    ["5","10","15","30","45","60","90","120","150","180"], 
    ["Hospital Committee","Peer Review","EHR Improvement","Quality Improvement","Business Development"], ] 

class EventFormViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate{ 


    @IBOutlet weak var eventPicker: UIPickerView! 
    @IBOutlet weak var eventLabel: UILabel! 
    @IBOutlet weak var commentField: UITextField! 


    func updateLabel(){ 
     let selectedTime = eventChoices[0][eventPicker.selectedRowInComponent(0)] 
     let event = eventChoices[1][eventPicker.selectedRowInComponent(1)] 


     eventLabel.text = "Chose \(event) for \(selectedTime) mins" 
    } 

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

    override func viewDidLoad() { 
     super.viewDidLoad() 

     } 


     // Do any additional setup after loading the view. 




    } 

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

    // returns the number of 'columns' to display. func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
    return eventChoices.count } 

    // returns the # of rows in each component.. 
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{ 

     return eventChoices[component].count 



    } 



    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { 
     return eventChoices[component][row] } 

    func pickerView(pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat { 
     if (component == 0) { 
      return 50.0; 
     } 
     return 300.0; 
    } 



    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 

Answer 1

有很多的問題，在你的代碼。

的函數頭被註釋。

// returns the number of 'columns' to display. func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
    return eventChoices.count } 

應該是這樣：

您的viewDidLoad實施後關閉類定義權。

應該是這樣：

import UIKit 

var eventChoices = [ 
    ["5","10","15","30","45","60","90","120","150","180"], 
    ["Hospital Committee","Peer Review","EHR Improvement","Quality Improvement","Business Development"], ] 

class EventFormViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate 
{ 


    @IBOutlet weak var eventPicker: UIPickerView! 
    @IBOutlet weak var eventLabel: UILabel! 
    @IBOutlet weak var commentField: UITextField! 


    func updateLabel() 
    { 
     let selectedTime = eventChoices[0][eventPicker.selectedRowInComponent(0)] 
     let event = eventChoices[1][eventPicker.selectedRowInComponent(1)] 


     eventLabel.text = "Chose \(event) for \(selectedTime) mins" 
    } 

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

    override func viewDidLoad() 
    { 
     super.viewDidLoad() 
    } 

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

    // returns the number of 'columns' to display. 
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int 
    { 
     return eventChoices.count 
    } 

    // returns the # of rows in each component.. 
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 
    { 
     return eventChoices[component].count 
    } 

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! 
    { 
     return eventChoices[component][row] 
    } 

    func pickerView(pickerView: UIPickerView, widthForComponent component: Int) -> CGFloat 
    { 
     var width = 300.0 
     if (component == 0) 
     { 
      width = 50.0; 
     } 
     return width; 
    } 



    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    */ 
} 

Answer 2

你已經有了一些打字-錯誤：

之前你didReceiveMemoryWarning你有其封閉類閉括號。所以你的其他方法不在UIPickerViewDelegate的類中，因此委託人認爲這些方法不存在。

因此，將括號移至代碼的末尾以關閉該類。

其次，在didReceiveMemoryWarning方法後出現錯誤。你有outcommented的方法標題：

// returns the number of 'columns' to display. func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
    return eventChoices.count } 

因此改變，要像她那樣：

// returns the number of 'columns' to display. 
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
     return eventChoices.count 
} 

最後但並非最不重要的，你需要重寫didReceiveMemoryWarning方法。所以改變：

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

到：

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