Bindings: Two-Way Connections

Reading is easy — writing takes a Binding

Text("30 min walk") only reads state. A text field is different: it must read the current value and write back every character the user types. For that, SwiftUI has the Binding — a two-way connection to a value that lives somewhere else. Through a binding you can read the value and write it.

Every @State property comes with a free binding, spelled with a $ prefix. If email is the String, then $email is the Binding<String> — same value, plus write access.