Persist DBCustomVariable

[boehlefeld]

Is there a way to set DBCustomVariables that survive App restarts ?

[dbukowski]

Hi @boehlefeld

By default, DBCustomVariables store the values in memory. However, they provide a mechanism that informs you when the values are modified in the menu. You can use that to store those new values in a place that will survive app restart, for example in the UserDefaults. Here is an example:

let customVariableName = "Example Variable"
let customVariableValueKey = "Example Variable Value"

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Define the variable. Note that the initial value depends on the value stored in the UserDefaults.
    let exampleVariable = DBCustomVariable(name: customVariableName,
                                           value: UserDefaults.standard.bool(forKey: customVariableValueKey))

    // Add a callback to be informed when the value changes.
    exampleVariable.addTarget(self, action: #selector(didUpdateExampleVariable(customVariable:)))

    // Add the variable.
    DBDebugToolkit.add(exampleVariable)
    return true
}

// Callback.
@objc func didUpdateExampleVariable(customVariable: DBCustomVariable) {
    let value = customVariable.value as? Bool
    UserDefaults.standard.set(value ?? false, forKey: "test")
}