What approaches exist for implementing subscription to Flow within a custom View in Android?

In SwiftUI, the lifecycle of a View differs from the traditional UIKit approach and is based on a declarative paradigm. A View in SwiftUI is a struct that describes the UI and its state.

Main stages of a View's lifecycle in SwiftUI:

1. Initialization — the View struct is created with initial parameters.
2. Body computation — SwiftUI calls the body property to get the UI description based on the current state.
3. Rendering — the system renders the UI on the screen.
4. Updating — when state changes (e.g., @State, @ObservedObject), SwiftUI re-invokes body to update the interface.
5. Destruction — when the View is no longer needed, it is removed from the hierarchy.

Memory management is automatic: SwiftUI tracks state changes and updates the UI without explicit memory or lifecycle management like in UIKit. For more complex control, modifiers like .onAppear and .onDisappear can be used to perform actions when the View appears or disappears.

Example using onAppear and onDisappear:

struct ContentView: View {
    @State private var isLoaded = false

    var body: some View {
        Text(isLoaded ? "Data loaded" : "Loading...")
            .onAppear {
                loadData()
            }
            .onDisappear {
                cleanup()
            }
    }

    func loadData() {
        // Load data
        isLoaded = true
    }

    func cleanup() {
        // Cleanup resources
    }
}