public func getVideoThumbnailImage(url: URL) -> Image {
let urlAsset = AVURLAsset(url: url, options: nil)
let assetImageGenerator = AVAssetImageGenerator(asset: urlAsset)
assetImageGenerator.appliesPreferredTrackTransform = true
assetImageGenerator.apertureMode = .encodedPixels
let cmTime = CMTime(seconds: 1, preferredTimescale: 60)
var thumbnailCGImage: CGImage?
var errorOccurred = false
let semaphore = DispatchSemaphore(value: 0)
assetImageGenerator.generateCGImageAsynchronously(for: cmTime) { generatedImage, timeGenerated, error in
if error == nil {
if let cgVideoImage = generatedImage {
thumbnailCGImage = cgVideoImage
} else {
errorOccurred = true
}
} else {
errorOccurred = true
}
semaphore.signal()
return
}
_ = semaphore.wait(timeout: .now() + 30)
if errorOccurred {
return Image("ImageUnavailable")
}
if let thumbnailImage = thumbnailCGImage {
let uiImage = UIImage(cgImage: thumbnailImage)
return Image(uiImage: uiImage)
}
return Image("ImageUnavailable")
}
I am using Xcode 16 beta 2 for iOS 18 with SwiftUI.
My code above works instantly and correctly; however, Xcode produces the purple warning: "Thread running at User-interactive quality-of-service class waiting on a lower QoS thread running at Default quality-of-service class. Investigate ways to avoid priority inversions"
How can I change the code to avoid the purple warning?
