swiftbindingstatecombinepublisher

How to attach subscriber to State or Binding in SwiftUI/Combine?

With a Combine Publisher, I can use the following to call a closure whenever a value changes:

let cancellable = x.sink { value in … }

How can I achieve the same behaviour with a variable marked @State or @Binding?

Solution

  • You can use .onChange(of:) instead on the property

    .onChange(of: someProperty) { value in
    //use new value for someProperty
 }

    or from iOS 17, macOS 14 etc the new onChange

    .onChange(of: someProperty) { _, value in
    //use new value for someProperty
 }