How to change the size of the font for whole project during runtime?

Question

Hello everyone, I want to make a dynamic update of the font size, I tried it like here(https://learn.microsoft.com/en-us/training/modules/use-shared-resources/4-use-and-update-dynamic-resources), but not everything ok, however I used dynamic resources. On SettingsPage it works, on TaskPage it does not.

Answer 1

Hello,

This is because when a Resource is set, its scope is limited to the current page.

You can save the resource key to the Preferences class in MAUI and load the dynamic resource in the OnDisplaying method of the TaskPage.

Please refer to the following documentation and code:

• Preferences.

Write Preferences.Default.Set("FontSizeKey", "Your_Resource_Key"); to the method that changes the fontsize.

Read dynamic resources when the taskpage loads:

protected override void OnAppearing()
{
    base.OnAppearing();
    var size = Preferences.Default.Get("FontSizeKey", "Unknown");
    if (!size.Equals("Unknown"))
    {
        Resources["FS"] = App.Current.Resources[size];
    }
}

Best Regards,

Alec Liu.

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