Since iOS 18.3.1, In lower iOS versions it works fine though. QLPreviewController shows a blank white screen instead of showing the document. Additionally, it does not display the 'Done' option at the top-right to close the view. Presenting the QLPreviewController works fine to display the document, but for the second time, it renders the blank white screen as described. While launching QLPreviewControllerView for the first time. I'm receiving the following message in the console and it displays the document. LaunchServices: store (null) or url (null) was nil: Error Domain=NSOSStatusErrorDomain Code=-54 "process may not map database" UserInfo={NSDebugDescription=process may not map database, _LSLine=72, _LSFunction=_LSServer_GetServerStoreForConnectionWithCompletionHandler} Attempt to map database failed: permission was denied. This attempt will not be retried. Closing the QLPreviewController with the help of the 'Done' option from top-right or swipe to close triggers the following message in the console. Connection to appex interrupted AX Lookup problem - errorCode:1100 error:Permission denied portName:'com.apple.iphone.axserver' PID:1022 ( 0 AXRuntime 0x00000001d2cd7758 _AXGetPortFromCache + 796 1 AXRuntime 0x00000001d2cdd02c AXUIElementPerformFencedActionWithValue + 700 2 UIKit 0x0000000258cdf488 7F0274D9-D3C9-3193-B606-1C74BE53B86C + 1537160 3 libdispatch.dylib 0x0000000101bb888c _dispatch_call_block_and_release + 32 4 libdispatch.dylib 0x0000000101bba578 _dispatch_client_callout + 20 5 libdispatch.dylib 0x0000000101bc2454 _dispatch_lane_serial_drain + 840 6 libdispatch.dylib 0x0000000101bc325c _dispatch_lane_invoke + 408 7 libdispatch.dylib 0x0000000101bd06fc _dispatch_root_queue_drain_deferred_wlh + 328 8 libdispatch.dylib 0x0000000101bcfd0c _dispatch_workloop_worker_thread + 580 9 libsystem_pthread.dylib 0x0000000225ea4680 _pthread_wqthread + 288 10 libsystem_pthread.dylib 0x0000000225ea2474 start_wqthread + 8 ) Trying to open he document again, Ultimately results in the white blank screen to be displayed with no options to close. It displays the Navigation bar only for the fraction of time. Leading users to force close the app and start again.

We were using below delegate methods from QuickLook to get modified PDF file URL after the sketching But we are not able see the multi line text properly laid out on PDF and part of text missing. Same time Other pencil kit tools are working as expected. `func previewController(_ controller: QLPreviewController, didSaveEditedCopyOf previewItem: QLPreviewItem, at modifiedContentsURL: URL) func previewController(_ controller: QLPreviewController, didUpdateContentsOf previewItem: any QLPreviewItem)` We tested all code in iOS 18.2. Please let us know if the text edited URL on PDF can be retrieved in any possible way without tampering text

I have an app on the Mac App Store (so sandboxed) that includes a QuickLook Preview Extension that targets Markdown files. It established a QLPreviewingController instance for the macOS QuickLook system to access and it works. I'm in the process of updating it so that it displays inline images referenced in the file as well as styling the file's text. However, despite setting Downloads folder read-only access permission (and user-selected, though I know that shouldn't be required: no open/save dialogs here) in the extension's entitlements, Sandbox refuses too allow access to the test image: I always get a deny(1) file-read-data error in the log. FWIW, the test file is referenced in the source Markdown as an absolute unix file path. I've tried different signings and no joy. I’ve tried placing the referenced image in various other locations. Also no joy. All I can display is the error-case bundle image for 'missing image'. Question is, is this simply something that QuickLook extensions cannot do from within the sandbox, or am I missing something? Is there anything extra I can do to debug this?

I've developed a new Quicklook data-based preview extension for a custom file type that generates an image preview of the file. I previously used a Quick Look generator plug-in but support for it was deprecated and now removed in macOS Sequoia. My app opens files using a open(url.path, O_RDWR | O_NONBLOCK | O_EXLOCK) call. The locking flags are used to prevent other clients from writing the file if it's already open. I discovered that when Finder is showing the “large” file previews (such as when in column or gallery modes) from a SMB share, the open call fails with EWOULDBLOCK as if the file is locked. It does work just fine on local files. Opening with O_SHLOCK also has the issue. Surprisingly it does work just fine for previews that return Plain Text data instead of Image data. Using the lsof command, it seems like the Quicklook process has some kind of lock on the file. This is the output of the lsof command: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE QuickLook 48487 XXXX txt REG 1,15 125000611 3161369 Attached is a test project that tries a few different opening and locking functions. It also includes a test file and a sample image preview extension that displays a red square. When everything is working, regular console messages show the progress of the tests. When the file is on a SMB share and selected in Finder Gallery mode, the open test will fail with a fault message in the console. Notably, locking with flock works, which is weird because it should have similar semantics according to the man page for open(2). Filed this as FB15051186

I'm trying to look at what the best way to do thumbnails for images that are saved in core data, which are being synced across multiple devices. I know I can save a lower quality version into core data, but I'm wondering if there's a better way of doing it. I've come across quick look thumbnailing which looks like what I want, but I'm not sure if it can be adapted for core data as its using file paths, whereas the images are stored in a data type property in core data. From what I can tell, I'd have to save the image locally, produce the thumbnail, then delete the local image

QLPreview keeps blinking and stops previewing the file when opening some high-resolution PDF files with heavy content. This can only be simulated in a real device built in xcode simulators cant simulate the issue. Tested in Xcode Version 15.4 (15F31d) and iPadOS Version 17.5.1. Following is My Sample code : import UIKit import QuickLook class ViewController: UIViewController { var currentViewFilePath = "" let preview = QLPreviewController() override func viewDidLoad() { super.viewDidLoad() self.setupQLPreview() loaddata() // Do any additional setup after loading the view. } func loaddata(){ if let fileURL = Bundle.main.url(forResource: "CD28048D", withExtension: "pdf") { self.currentViewFilePath = fileURL.relativePath self.preview.reloadData() // Use the fileURL here print("File URL: \(fileURL)") } else { print("File not found") } } } extension ViewController:QLPreviewControllerDelegate,QLPreviewControllerDataSource{ func setupQLPreview(){ preview.delegate = self preview.dataSource = self self.view.addSubview(preview.view) let previewhight = (UIScreen.main.bounds.height - ((self.navigationController?.navigationBar.frame.height ?? 0))) preview.view.translatesAutoresizingMaskIntoConstraints = false preview.view.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true preview.view.leftAnchor.constraint(equalTo: self.view.leftAnchor,constant: 4).isActive = true preview.view.rightAnchor.constraint(equalTo: self.view.rightAnchor,constant: -4).isActive = true preview.view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor,constant: 4).isActive = true preview.view.trailingAnchor.constraint(equalTo: self.view.trailingAnchor,constant: -4).isActive = true preview.view.widthAnchor.constraint(equalToConstant: self.view.frame.width-8).isActive = true preview.view.heightAnchor.constraint(equalToConstant: previewhight-4).isActive = true preview.view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true preview.navigationController?.isNavigationBarHidden = true self.addChild(preview) preview.didMove(toParent: self) } func numberOfPreviewItems(in controller: QLPreviewController) -> Int { if self.currentViewFilePath.isEmpty || self.currentViewFilePath == ""{ return 0 }else{ return 1 } } func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem { let fileUrl = URL(fileURLWithPath: self.currentViewFilePath) return fileUrl as QLPreviewItem } } while running the above code Xcode debugger prints following errors: View service did terminate with error: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted} #Remote Preview collection viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted} #Remote [u 0AA9D4C5-BBA1-56F6-8FFF-F5F56B99399A:m (null)] [com.apple.quicklook.extension.previewUI(1.0)] Connection to plugin invalidated while in use.

Default behaviour of the macOS when interacting via Finder with a network share is to create thumbnails to provide a nice user experience. This behaviour is implemented by QuickLook framework. This triggers the full file download and quickly lead to cache using large disk space and even cache trashing. We can disable QuickLook selectively by injecting specially prepared .DS_Store file with instruction/setup to disable thumbnails in that directory but still degrades user's experience only in the network share ecosystem. Is there any way we can provide our own thumbnails or ask Finder to not download full file to generate the thumbnail?

I want to provide my own thumbnails for the file types which System already provides thumbnails for. I tried using QLThumbnailProvider however it works only when the file type is custom. For system supported file types it doesn't allow me to override my own thumbnails. Is there any alternative to this?

I am developing Thumbnail Extension. To prepare a graphic (in .dylib) for file specified in URL.path I need to access second file, which has the same filename, but different extension. For example, I have "data" in file.*** and "colors" in file.yyy. Is it possible to read data from this second file while processing the first file in my extension? In my current implementation it sometimes works, but most of the time it doesn't work - it is not possible to read data from file.yyy when preparing thumbnail for file.***, causing exception in my .dylib routine. Is there some setting which would allow me to do this?

We have QuickLook thumbnailing framework which is used to provide thumbnails for custom file types. However, how can we provide thumbnails for system defined file types for eg. image file types? Is there any way to achieve this?