Instance Method
index(before:)
iOS 15.0+
iPadOS 15.0+
Mac Catalyst 15.0+
macOS 12.0+
tvOS 15.0+
watchOS 8.0+
func index(before i: AttributedString.Runs.AttributesSlice4<T, U, V, W>.Index) -> AttributedString.Runs.AttributesSlice4<T, U, V, W>.Index