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I've been using the new template for a document-based SwiftUI app. While you get a lot of file-management "for free" in the new template, as it stands in the iOS version users have to back out of the file to the file browser to change the filename. I want to create an opportunity for the user to rename the file while it is open.
Here's a sample project focused on the issue: https://github.com/stevepvc/DocumentRenamer
In the code, I've added to the template code a simple UI with a textfield for the user to enter a new name. When the user hits the "rename" button, the app checks to see if the URL with that name component is available, appending a suffix if necessary to create a target url.
func getTargetURL() -> URL {
		let baseURL	=	self.fileurl.deletingLastPathComponent()
		print("filename: \(self.filename)")
		print("fileURL: \(self.fileurl)")
		print("BaseURL: \(baseURL)")
		var target = URL(fileURLWithPath: baseURL.path + "/\(filename).exampletext")
		var nameSuffix = 1
		
		while (target as NSURL).checkPromisedItemIsReachableAndReturnError(nil) {
				
				target = URL(fileURLWithPath: baseURL.path + "/\(filename)-\(nameSuffix).sermon")
				print("Checking: \(target)")
				nameSuffix += 1
	 }
		print("Available Target: \(target)")
		return target
}
It then attempts to rename the file, and this is when I am stuck. I have tried several methods, most recently the following:
func changeFilename(){
		let target	= getTargetURL()
		var rv = URLResourceValues()
		let newFileName = target.deletingPathExtension().lastPathComponent
		rv.name = newFileName
		do {
				if fileurl.startAccessingSecurityScopedResource(){
						try fileurl.setResourceValues(rv)
						fileurl.stopAccessingSecurityScopedResource()
				}
		} catch {
				print("Error:\(error)")
		}
}
But I keep getting the following error whenever I run the app on a device:
Domain=NSCocoaErrorDomain Code=513 "You don’t have permission to save the file “Untitled” in the folder “DocumentRenamer”."
I have also tried this without the startAccessingSecurityScopedResource() check, and alternatively have tried creating a helper class as follows:
class FileMover: NSObject {
func moveFile(originalURL: URL, updatedURL:URL) -> Bool {
		let coordinator = NSFileCoordinator(filePresenter: nil)
		var writingError: NSError? = nil
		var success : Bool = true
		print("moving file")
		coordinator.coordinate(writingItemAt: originalURL, options: NSFileCoordinator.WritingOptions.forMoving, error: &writingError, byAccessor: { (coordinatedURL) in
				do {
						try FileManager.default.moveItem(at: coordinatedURL, to: updatedURL)
						success = true
						print("file moved")
						
				} catch {
						print(error)
						success = false
				}
		})
return success
		
}
}
But using this method locks up the app entirely.
What is the correct method for renaming a file in the app's container, particularly using the new Swiftui Document based template?
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stevepvc.
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stevepvc.
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