register
open override fun register(flow: Flow<Boolean>, colorMode: ColorMode, statusColorMode: ColorMode, navigationColorMode: ColorMode, @IntRange(from = 0, to = 255) systemBarAlpha: Int, @IntRange(from = 0, to = 255) statusBarAlpha: Int, @IntRange(from = 0, to = 255) navigationBarAlpha: Int): SystemBarColorHelperBuilder
When this flow emits true and it is the first one to do so, system bars will be colored according to the provided options.