在swift中重新加载pickerView的特定行

Question

我有一个pickerView由一个标签和图像组成。当pickerview被点击时，我正在更新该图像。但要显示图像的变化，我必须重新加载pickerView。当我重新加载它回到第一行。有没有办法重新加载只有特定行的pickerView？

代码：

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() 

        } 
       } 

代码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

没有这样的系统的方法。但是，如果您使用的是自定义视图，你可以尝试这样的事：

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

编辑：

首先，你需要，你需要查看标签添加到您的自定义视图元素（可以定义两个常量这个）：

label.tag = 10 
imageView.tag = 20 

而选择发生后，你需要刷新你的视图的状态。你可以这样做：

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] 
}