为什么当控制器出现时我的 Switch 总是关闭？

Question

I made a SwitchRow with Eureka but can't get it to work that my switch saves it current state. It is always shown as off when the SettingsView is presented modally. It is a little bit irritating because I save the row value to the UserDefaults and you can't tell if it is on or not. Here is my code:

class SettingsView : FormViewController{
    override func viewDidLoad() {
        super.viewDidLoad()
    
            +++ Section("Messages")
            <<< SwitchRow("message_people_withId") { row in
                row.title = "Activate messages"
            }.onChange { row in
                row.title = (row.value ?? false) ? "Deactivate messages" : "Activate messages"
                row.updateCell()
                UserDefaults.standard.set(row.value ?? false, forKey: "MessageSettingsRow")

            }

This creates a switch which changes the title if the user turns it off or on. But the ui changes are not reflected. I thought the best way would be to check for the switch row itself and change its value depending on the row value:

 if row.value == true {
                    (self.form.rowBy(tag: "message_people_withId") as? SwitchRow)?.cell.switchControl.isOn = true
                } else {
                    (self.form.rowBy(tag: "message_people_withId") as? SwitchRow)?.cell.switchControl.isOn = false
                }

but this changes nothing.

Any suggestions? Thanks in advance.

Answer 1

You need to define the row.value Therefore making your code similar to;

class SettingsView : FormViewController{
    override func viewDidLoad() {
        super.viewDidLoad()
    
            +++ Section("Messages")
            <<< SwitchRow("message_people_withId") { row in
                row.title = "Activate messages"
                row.value = UserDefaults.standard.bool(forKey: "MessageSettingsRow")
            }.onChange { row in
                row.title = (row.value ?? false) ? "Deactivate messages" : "Activate messages"
                row.updateCell()
                UserDefaults.standard.set(row.value ?? false, forKey: "MessageSettingsRow")

            }

This will ensure the correct value on viewDidLoad() .

Your second code block, the one that evalutes row.value to be true or not will always return false given the standard state of the SwitchRow is false.

Answer 2

Making it simple your row value is not getting updated

 print(row.value)

You are getting every time true so your switch always on

if row.value == true {
                (self.form.rowBy(tag: "message_people_withId") as? SwitchRow)?.cell.switchControl.isOn = true
            } else {
                (self.form.rowBy(tag: "message_people_withId") as? SwitchRow)?.cell.switchControl.isOn = false
            }