选择器没有快速输出行数据 3

Posted 2023-03-10

【中文标题】选择器没有快速输出行数据 3

【英文标题】：Picker not outputting row data swift 3

【发布时间】：2018-06-21 15:28:33

【问题描述】：

我正在尝试为任务应用程序编写颜色选择器。当我尝试添加任务时，选择器永远不会更改我的“picked”变量（在第 5 行声明），只会打印“空白”（第 7 行）。我对采摘者来说足够新，我看不出我做错了什么。我相当确定它与我的 didSelectRow 函数（最后一个函数）的设置有关，因为如果该函数被触发，它仍然会在 else 语句中设置一些东西，即使它不是我想要的字符串，但它不是进行任何更改。

class SecondViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource 

    @IBOutlet weak var input: UITextField!

    @IBOutlet weak var picker: UIPickerView!

    var pickerData: [String] = [String]()

    var picked: String = "blank"

    @IBAction func addItem(_ sender: Any) 
        print (picked)
        if (input.text != "" && picked != "") 
            list.append(input.text! as AnyObject)
            if picked == "Red" 
                colors.append(UIColor.red)
            
            else if picked == "Orange" 
                colors.append(UIColor.orange)
            
            else if picked == "Yellow" 
                colors.append(UIColor.yellow)
            
            else if picked == "Green" 
                colors.append(UIColor.green)
            
            else if picked == "Blue" 
                colors.append(UIColor.blue)
            
            else if picked == "Purple" 
                colors.append(UIColor.purple)
            
            else if picked == "White" 
                colors.append(UIColor.white)
            
            input.text = ""
            userDefaults.set(list, forKey: "tasks")
        
    

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

        pickerData = ["Select a color", "White", "Red", "Orange", "Yellow", "Green", "Blue", "Purple"]
    

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

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

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

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 
        return pickerData[row]
    

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
        if row == 0 
            picked = ""
        
        else 
            picked = pickerData[row]
        
    

【参考方案1】：

你忘记了参数标签_

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

【讨论】：

谢谢！