system.deletePreferences()

Type Function

Library system.*

Return value Boolean

Revision Release 2022.3683

Keywords system preference, deletePreferences

See also system.getPreference()

system.setPreferences()

Overview

Deletes preferences from storage.

Returns true if all of the given preferences were successfully deleted and no longer exist in storage. If a requested preference did not already exist in storage, it's still regarded as successfully deleted.

Returns false if at least one of the given preferences failed to be deleted from storage.

Gotchas

This function is a blocking call and it won't return a result until all of the given preferences have been deleted from storage. As a result, this function may cause performance issues and it should not be called frequently, during active gameplay, or in a UI object's listener function. For best performance, it's best to delete multiple preferences via a single call after leaving a scene or during an "applicationExit" system event.

Syntax

system.deletePreferences( category, preferenceNames )

category _^(required)

String. Indicates which set of preferences should be accessed on the system. Currently, only the "app" category is supported — this is the application's custom preferences defined by the Corona app developer.

preferenceNames _^(required)

Array. An array of strings indicating unique preference names to be deleted from storage.

Example

-- Write this app's custom preferences to storage
local appPreferences =
{
    myBoolean = true,
    myNumber = 123.45,
    myString = "Hello World"
}
system.setPreferences( "app", appPreferences )

-- Sometime later, delete the preferences that were written to storage
system.deletePreferences( "app", { "myBoolean", "myNumber", "myString" } )

Type	Function
Library	system.*
Return value	Boolean
Revision	Release 2022.3683
Keywords	system preference, deletePreferences
See also	system.getPreference()
	system.setPreferences()