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Since the Button does not have TextDisabledColor the button when disabled in iOS ignores the TextColor property. This is simple to reproduce with the below code. The text becomes unreadable on dark background.
This is a possible cause for this bug as well: https://bugzilla.xamarin.com/show_bug.cgi?id=26862
// The root page of your application
MainPage = new ContentPage
Content = new StackLayout
VerticalOptions = LayoutOptions.Center,
Text = "White text on black background",
TextColor = Color.White,
BackgroundColor = Color.Black,
IsEnabled = false
Thank you for your feature request. We have added it to our internal list for consideration.