以编程方式在iOS中循环SwiftUI实时照片

Question

我希望能够循环一张实时照片，以便继续播放。

到目前为止，我正在尝试使用PHLivePhotoViewDelegate来完成这一任务。

import Foundation
import SwiftUI
import PhotosUI
import iOSShared

struct LiveImageView: UIViewRepresentable {
    let view: PHLivePhotoView
    let model:LiveImageViewModel?
    let delegate = LiveImageLargeMediaDelegate()
    
    init(fileGroupUUID: UUID) {
        let view = PHLivePhotoView()
        // Without this, in landscape mode, I don't get proper scaling of the image.
        view.contentMode = .scaleAspectFit
        
        self.view = view
        
        // Using this to replay live image repeatedly.
        view.delegate = delegate
        
        model = LiveImageViewModel(fileGroupUUID: fileGroupUUID)
        
        guard let model = model else {
            return
        }
        
        model.getLivePhoto(previewImage: nil) { livePhoto in
            view.livePhoto = livePhoto
        }
    }
    
    func makeUIView(context: Context) -> UIView {
        return view
    }
    
    func updateUIView(_ uiView: UIView, context: Context) {
        guard let model = model else {
            return
        }
        
        guard !model.started else {
            return
        }
        
        model.started = true
        view.startPlayback(with: .full)
    }
}

class LiveImageLargeMediaDelegate: NSObject, PHLivePhotoViewDelegate {
    func livePhotoView(_ livePhotoView: PHLivePhotoView, didEndPlaybackWith playbackStyle: PHLivePhotoViewPlaybackStyle) {
        livePhotoView.stopPlayback()
        DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(200)) {
            livePhotoView.startPlayback(with: .full)
        }
    }
}

但没有完全成功。似乎音频会再次播放，但不会播放视频。livePhotoView.stopPlayback和异步方面只是我尝试的额外更改。我也试过不戴那些。

请注意，我不希望用户必须手动更改实时照片(例如，请参阅NSPredicate to not include Loop and Bounce Live Photos)。

有什么想法？

Answer 1

ChrisPrince --我试过了你的代码，它对我来说很好，我只是在里面添加了委托并开始回放，一切运行都很顺利。我认为使用停止播放是没有意义的，因为函数本身说播放结束了。

func livePhotoView(_ livePhotoView: PHLivePhotoView, didEndPlaybackWith playbackStyle: PHLivePhotoViewPlaybackStyle) {
        livePhotoView.startPlayback(with: .full)
}