Hi, I notice a very slow transfer rate when I try to transfer a file picked via .photosPicker. This happens especially when I try to import a 4k/60fps video.
SwiftUI:
VStack {
Button("Pick a video") {
model.isPhotoPickerView = true
}
.photosPicker(isPresented: $model.isPhotoPickerView, selection: $model.selectedImageList, maxSelectionCount: 1, matching: .videos)
.onChange(of: model.selectedImageList, { old, new in
model.handlePhotoPicker()
})
}
View Model to handle Photo Picker action:
private class PageModel: ObservableObject {
//other methods
@MainActor
public func handlePhotoPicker() {
if selectedImageList.isEmpty {
return
}
guard let item = selectedImageList.first else {
return
}
Task {
do {
if let video = try await item.loadTransferable(type: VideoTransferable.self) {
let file = video.url
//video url arrived
}
} catch {
//handle error
}
}
}
}
Now the VideoTransferable :
struct VideoTransferable: Transferable {
let url: URL
static var transferRepresentation: some TransferRepresentation {
FileRepresentation(contentType: .movie) { video in
SentTransferredFile(video.url)
}
importing: { received in
//takes too much time to import large 4K video recorded from iPhone's main camera
let copy = FileManager.documentsDirectory.appendingPathComponent(FolderType.temp.rawValue).appendingPathComponent("video_\(Int64(Date().timeIntervalSince1970 * 1000)).MOV")
if FileManager.default.fileExists(atPath: copy.path) {
try FileManager.default.removeItem(at: copy)
}
try FileManager.default.copyItem(at: received.file, to: copy)
return Self.init(url: copy)
}
}
}
To my surprise this issue doesn't happen when I use a custom UIViewControllerRepresentable to wrap UIImagePickerController() and setting videoExportPreset property of the picker to AVAssetExportPresetPassthrough
Can someone point me out where I am wrong?
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