Do you need binding to show changes in a child view

In SwiftUI, a binding is used to create a two-way reference to the state of another view. This is particularly useful when you want to synchronize changes between a parent view and a child view. For example, if you have a container view that holds a rating view and a gauge, you can use a binding to ensure that changes in the rating view are reflected in the container view and the gauge. This way, the container view's state becomes the single source of truth, and both the rating view and the gauge update in sync.

In the session titled "SwiftUI essentials," it is explained that when the rating view increments its own state, the container view state and the gauge do not change unless a binding is used. By providing a binding as an input to the rating view, the container view can maintain a consistent state across its child views. This approach allows for a more cohesive and synchronized UI.

For more details, you can refer to the session SwiftUI essentials (12:29).