What does the SwiftUI `@State` keyword do?

Question

The SwiftUI tutorial uses the @State keyword to indicate mutable UI state:

@State var showFavoritesOnly = false

It offers this summ

Answer 1

Let me add something else if you know React Native.

The @State property is very like the this.state object in React Native.

For example:

struct Foobar: some View {
    @State var username = ""
}

class Foobar extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      username: '',
    };
  }
}

When you modify the username variable, they will have the same effect, that re-render the current page.