在swift中重新加載pickerView的特定行

Question

我有一個pickerView由一個標籤和圖像組成。當pickerview被點擊時，我正在更新該圖像。但要顯示圖像的變化，我必須重新加載pickerView。當我重新加載它回到第一行。有沒有辦法重新加載只有特定行的pickerView？

代碼：

if selectedRows.contains(contactPerson.text!) { 
         FilteredQuestion_Images[row] = UIImage(named: "Unchecked Checkbox-26")! 
        let image = FilteredQuestion_Images[row] 
        imageView = UIImageView(image: image) 

        if let itemToRemoveIndex = selectedRows.index(of: contactPerson.text!) { 
         selectedRows.remove(at: itemToRemoveIndex) 
         ContactPersons_Multiple.remove(at: itemToRemoveIndex) 
        } 

        self.dropdownPicker.reloadAllComponents() 

       }else { 


        selectedRows.append(contactPerson.text!) 
        self.imageName = "Checked Checkbox-26" 

        FilteredQuestion_Images[row] = UIImage(named: "Checked Checkbox-26")! 

        let image = FilteredQuestion_Images[row] 
        imageView = UIImageView(image: image) 

        self.dropdownPicker.reloadAllComponents() 

        } 
       } 

代碼ViewForRow的：

 func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView { 
    let customeView = UIView(frame: CGRect(x: 0, y: 0, width: self.dropdownPicker.rowSize(forComponent: 0).width, height: 30)) 

      // for label 
      let label = UILabel(frame: CGRect(x: 0, y: 0, width: customeView.frame.width - 35, height: 30)) 
      label.textAlignment = .left 

      label.text = self.ContactPers[row] 

      if FilteredContactsSelected == true { 
       label.text = FilteredContactsNames[row] 
      } 


      let image = FilteredQuestion_Images[row]//UIImage(named: imageName) 
      imageView = UIImageView(image: image) 



      imageView?.frame = CGRect(x: self.dropdownPicker.rowSize(forComponent: 0).width - 36 , y: 0, width: 26, height: 26) 

      customeView.addSubview(imageView!) 
      customeView.addSubview(label)//pickerLabel) 

      return customeView//pickerLabel 
} 

Answer 1

沒有這樣的系統的方法。但是，如果您使用的是自定義視圖，你可以嘗試這樣的事：

(pickerView.view(forRow: <#T##Int#>, forComponent: <#T##Int#>) as? MyCustomView).image = newImage 

編輯：

首先，你需要，你需要查看標籤添加到您的自定義視圖元素（可以定義兩個常量這個）：

label.tag = 10 
imageView.tag = 20 

而選擇發生後，你需要刷新你的視圖的狀態。你可以這樣做：

if let myView = pickerView.view(forRow: row, forComponent: 0) as? UIView, 
     let label = myView.viewWithTag(10) as? UILabel, 
     let imageView = myView.viewWithTag(20) as? UIImageView{ 

     label.text = FilteredContactsNames[row] 
     imageView.image = ilteredQuestion_Images[row] 
}