如何根据之前的选择器视图选择更新PickerView 数据

Posted 2023-02-24

【中文标题】如何根据之前的选择器视图选择更新PickerView 数据

【英文标题】：how to updatePickerView Data according to previous picker view selection

【发布时间】：2018-05-04 21:20:19

【问题描述】：

我有 2 个pickerView。一个是显示课程，另一个是根据课程 ID（响应来自 Json）显示课程部分现在问题是当我选择课程（比如说微积分）然后选择 sectionPickerView 它给了我相应部分的列表（A，B ,C,D) 但是当我再次将课程更改为（英语）时，PickerView 部分仍然显示相同的部分，并且不会根据 Course Pickerview 更新部分。

这是我的代码：

let coursesPicker = UIPickerView()
let sectionsPicker = UIPickerView()

var countryId = 0

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


func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 
    if pickerView == coursesPicker 
        return GetCourses.instance.getCoursesInstance.count
     else 
        return GetSectionService.sectionsServiceinstance.sectionModelInstance.count  
    


func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 
    if pickerView == coursesPicker 
        return GetCourses.instance.getCoursesInstance[row].courseName
     else 
        return GetSectionService.sectionsServiceinstance.sectionModelInstance[row].sectionName
            


func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
    if pickerView == coursesPicker 
        coursesTextField.text = GetCourses.instance.getCoursesInstance[row].courseName
        countryId = GetCourses.instance.getCoursesInstance[row].id
        self.callSectioApi(id: countryId)
        self.coursesPicker.isHidden = true
     else 
        sectionTextField.text =  GetSectionService.sectionsServiceinstance.sectionModelInstance[row].sectionName
        self.sectionsPicker.isHidden = true
    
    self.view.endEditing(true)

根据课程 ID 更新 Url 的功能

func callSectioApi(id : Int) 

    let Idurl = String(id)
    let url1 = getSectionUrl+Idurl
    print(url1)

    GetSectionService.sectionsServiceinstance.getSectionsName(url: url1)  (success) in
        if success 
        let status = GetSectionService.sectionsServiceinstance.status
            if status == 400 
                print("400")
             else if status == 500 
                print("500")
             else if status == 404 
                print("404")
             else if status == 200 
                print("200")
                self.sectionTextField.text = ""
                self.sectionsPicker.reloadAllComponents()
             else 
                print("Error")
            
         else 
            let status = GetSectionService.sectionsServiceinstance.status
            print(status)
        
    

【参考方案1】：

您需要在选择课程后重新加载 sectionPicker。

所以，像下面这样更改你的 didSelect

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

    if pickerView == coursesPicker 

        coursesTextField.text = GetCourses.instance.getCoursesInstance[row].courseName
        countryId = GetCourses.instance.getCoursesInstance[row].id
        self.callSectioApi(id: countryId)

        //Reload sectionPicker
        self.sectionsPicker.reloadAllComponents()
        self.sectionsPicker.selectRow(0, inComponent: 0, animated: false)

        self.coursesPicker.isHidden = true

     else 

        sectionTextField.text =  GetSectionService.sectionsServiceinstance.sectionModelInstance[row].sectionName
        self.sectionsPicker.isHidden = true

    
    self.view.endEditing(true)