无法在iOS 15.1中生成实时照片

Question

在iOS 15.0中运行良好，但在升级到iOS 15.1后，代码无法正常工作。

_ = PHLivePhoto.request(withResourceFileURLs: [pairedVideoURL, pairedImageURL], placeholderImage: nil, targetSize: CGSize.zero, contentMode: PHImageContentMode.aspectFit, resultHandler: { (livePhoto: PHLivePhoto?, info: [AnyHashable : Any]) -> Void in

    if let isDegraded = info[PHLivePhotoInfoIsDegradedKey] as? Bool, isDegraded {

        return

    }

    DispatchQueue.main.async {

        completion(livePhoto, (pairedImageURL, pairedVideoURL))

    }

})

有人能帮上忙吗？

Answer 1

我也遇到了同样的问题：PHPhotosErrorKey error 3302也就是PHPhotosErrorInvalidResource，PHLivePhoto.request出现了故障。

研究后发现，从iOS15.1开始，包含实时照片id的"{MakerApple}"元数据字段停止写入图像文件元数据，因此livePhoto验证失败，因为LivePhoto的图像和电影部分的标识符需要相同。

在尝试了不同的方法后，我发现IOS没有在"{MakerApple}"图像上写入JPEG元数据。它只能在苹果自己的文件格式上做到这一点。(即heic)。(从IOS 15.1开始)

要解决此问题，请将您的图像部分编码为heic，"{MakerApple}"元数据将被保留。您可以使用以下内容来实现此目的：

let assetIdentifier = UUID()

guard
    let destintation = CGImageDestinationCreateWithURL(imageURL as CFURL, UTType.heic.identifier as CFString, 1, nil),
    let data = staticUIImage!.heic,
    let imageSource = CGImageSourceCreateWithData(data as CFData, nil)
else {
    return
}

var metadata = CGImageSourceCopyProperties(imageSource, nil) as! [String : Any]
let makerNote = ["17" : assetIdentifier.uuidString]
metadata[String(kCGImagePropertyMakerAppleDictionary)] = makerNote
CGImageDestinationAddImageFromSource(destintation, imageSource, 0, metadata as CFDictionary)
CGImageDestinationFinalize(destintation)

为了获取heic数据，我使用了Leo Dabus here提供的UIImage扩展

Answer 2

    func addAssetID(_ assetIdentifier: String, toImage imageURL: URL, saveTo destinationURL: URL) -> URL? {
        
        let kFigAppleMakerNote_AssetIdentifier = "17"
        
        let image = UIImage(contentsOfFile: imageURL.path)
        let imageRef = image?.cgImage
        let imageMetadata = [kCGImagePropertyMakerAppleDictionary: [kFigAppleMakerNote_AssetIdentifier: assetIdentifier]]

        let cfUrl = destinationURL as CFURL

        let dest = CGImageDestinationCreateWithURL(cfUrl, kUTTypeJPEG, 1, nil)
        CGImageDestinationAddImage(dest!, imageRef!, imageMetadata as CFDictionary)
        _ = CGImageDestinationFinalize(dest!)
        
        return destinationURL
    }