how to play a apple music song in swiftui?

To play an Apple Music song in SwiftUI, you can use the MusicKit framework, which provides APIs for integrating Apple Music into your app. Here's a basic example of how you might do this:

Import MusicKit: First, make sure to import the MusicKit framework.
Request Authorization: Request authorization to access the user's Apple Music library.
Fetch and Play a Song: Use the MusicPlayer to play a song.

Here's a simple example:

import SwiftUI
import MusicKit

struct ContentView: View {
    @State private var musicPlayer = MusicPlayer.shared
    
    var body: some View {
        VStack {
            Button(action: {
                Task {
                    do {
                        // Request authorization
                        let status = await MusicAuthorization.request()
                        guard status == .authorized else { return }
                        
                        // Fetch a song by its ID
                        let songID = MusicItemID("your-song-id-here")
                        let song = try await MusicCatalogResourceRequest<Song>(matching: \.id, equalTo: songID).response().items.first
                        
                        // Play the song
                        if let song = song {
                            musicPlayer.queue = [song]
                            try await musicPlayer.play()
                        }
                    } catch {
                        print("Error playing song: \(error)")
                    }
                }
            }) {
                Text("Play Song")
            }
        }
    }
}

Steps Explained:

Import MusicKit: This allows you to use the MusicKit framework.
Request Authorization: The app requests permission to access the user's Apple Music library.
Fetch and Play a Song: The app fetches a song using its ID and then plays it using the MusicPlayer.

For more detailed information on integrating media playback in SwiftUI, you might find the session Tailor macOS windows with SwiftUI useful, as it discusses organizing and playing videos, which can be analogous to playing music.

If you need more specific details or examples, you can refer to the session Migrate your TVML app to SwiftUI, which covers building media apps with SwiftUI.