SwiftUIって何っ。すっかり浦島状態継続。
以下のコード以外に、info.plistに権限要求を定義(追加)する必要があります。Valueはとりあえずは適当な文章で。起動後の権限要求画面で表示されます。Privacy - Media Library Usage Description
Privacy - Music Usage Description
また、実行は実機上で行う必要があります。Music Picker表示後に何も選ばずにキャンセルするとsetQueueでクラッシュします。
import SwiftUI
import MediaPlayer
struct ContentView: View {
@State var isPresented: Bool = false
@State var collection: MPMediaItemCollection?
var musicPlayer = MPMusicPlayerController.applicationMusicPlayer
var body: some View {
VStack(alignment: .center) {
Button("Select Music"){
self.isPresented.toggle()
}.sheet(isPresented: $isPresented, onDismiss: {
musicPlayer.setQueue(with: self.collection!)
musicPlayer.prepareToPlay()
musicPlayer.play()
}, content: {
MusicPicker(collection: self.$collection)
})
}.padding()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
struct MusicPicker: UIViewControllerRepresentable {
@Environment(\.presentationMode) var presentationMode
@Binding var collection: MPMediaItemCollection?
class Coordinator: NSObject, UINavigationControllerDelegate, MPMediaPickerControllerDelegate {
var parent: MusicPicker
init(_ parent: MusicPicker) {
self.parent = parent
}
func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) {
if (mediaItemCollection.items.count) > 0 {
parent.collection = mediaItemCollection
mediaPicker.dismiss(animated: true, completion: nil)
}
}
}
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<MusicPicker>) -> MPMediaPickerController {
let picker = MPMediaPickerController()
picker.allowsPickingMultipleItems = true
picker.delegate = context.coordinator
return picker
}
func updateUIViewController(_ uiViewController: MPMediaPickerController, context: UIViewControllerRepresentableContext<MusicPicker>) {
}
}理解はこれから・・・。チュートリアルをこなすのが手っ取り早いか。