Which build caches and unused SDKs can I delete to free up storage on my Mac Pro with the latest macOS Monterey that I just updated? The all fall under the heading "Xcode Project Build Files". I see some that are considered "Xcode Project Build Files" and some "iOS Device Support" and some that are considered "BridgeOS Device Support". They all have the Xcode icon. I explain in detail below how I get to this screen. Basically it's in the System Information app. I'm not sure what is safe to delete. I have to free up space to update my Xcode on my Mac Pro. When I look at the screen that shows when I got to the Apple Logo on the very top left-hand corner of the menu, then go to About this Mac, then the Storage Tab and then click on the button that says "Manage...", then click on the button that says "Review Files"... When I click on "Developer" on the left tab, I see some rather large files. At the top it says, "Remove project build caches and unused SDKs to free storage space."

The sample project CloudKitShare downloaded from developer.apple.com Sharing CloudKit Data with Other iCloud Users has a line of code in HandleCloudKitError.swift that optionally casts an instance of Error to a variable of type NSError. guard let nsError = error as NSError? else { return nil } Under what conditions would this fail? I thought this would always succeed. How do I find out why the cast is unsuccessful? When I put code that prints the type of variable 'error', it seems to always result in Optional like so: Code: guard let nsError = error as NSError? else { print(type(of: error)) return nil } Optional

I have wondered before how I can find out what messages have been sent and perhaps even to whom and from whom. What is the underlying technology behind the search feature in iOS when the user swipes right from the first screen of the home screen? Is that part of Siri. Setting group Siri and Search together. Does the search feature I speak of use Intents, and is that made accessible to developers. I have also noticed that there is an intent property to the extension context object that passes information between a host app and another app's share extension. I'm brainstorming and looking for any ideas. I hope someone out there have good information for me. macOS has Spotlight. Is that available on iOS?

What is the purpose of the following line of code? It doesn't seem to do anything. If it were in Playground or in a print statement it would at least show something. _ = masterVC.view It's in Apple's sample code at Sharing CloudKit Data with Other iCloud Users. Here's the complete significant code that contains that line of code: if let masterVC = masterNC?.viewControllers.first as? ZoneViewController {       _ = masterVC.view       start ? masterVC.spinner.startAnimating() : masterVC.spinner.stopAnimating() }

I found this article at Apple's Developer Documentation: Understanding the Exception Types in a Crash Report Anyone know where I can find specific documentation for the codes that go with each exception type? I got a run time error during a debug run of my Xcode project for iOS at a line of code where I initialize a custom struct. I want to look up what that "2" represents. Thread 3: EXC_BAD_ACCESS (code=2, address=0x16dbc7ff0) I think I found documentation at one time for those codes at another source outside of Apple. It seems there are codes that are used by hardware manufacturers for "architectures" such as "arm64" and "armv7". I see those in Xcode project build settings. Do I really need to know what each code as given in the error message represent? I found this documentation on Apple's Exception Handling Framework in a search with Google: Exception Handling. I don't see what I need. This framework seems to be more than I need at this time.

Can a shared CloudKit record have child records in a different zone, as long as they are in the same database?

I have used code to test whether a child record and a parent record have to be in the same zone. They do. Now... Does a parent record have to be in the same CKDatabase as a child record?

Can I add a CKDatabaseOperation to the queue belonging to a CKContainer object using CKContainer.add(_:)? The CKContainer.add(_:) method takes a CKOperation argument, so it will take a subclass of CKOperation as far as I can tell. I can't find any documentation on this. What I'm trying to figure out is which queue should I add a CKFetchRecordsOperation object to? Should I use CKDatabase.add(:), or CKContainer.add(:)? let fetchRecordsOperation = CKFetchRecordsOperation.fetchCurrentUserRecordOperation() I need the CKRecord for the current user for the entire CKContainer, or for the privateCloudDatabase and the sharedCloudDatabase to be specific. If I pass the CKFetchRecordsOperation object to the queue for CKDatabase, would that not return the current CKRecord for the current user for that CKDatabase only? I suspect that if there is a separate CKRecord representing the current user in each database in a container, that they would each hold identical values, even identical recordName fields. Is that the case?

Under what conditions should we use CKContainer.fetchUserRecordID() and then fetch the CKRecord object, and under what conditions should we use CKFetchRecordsOperation.fetchCurrentUserRecordOperation().

I need to take some suggestions from other programmers about something. When we have to use an asynchronous closure, often because the Framework provides only an asynchronous method for something we can't do without, it seems to prevent us from using the guard statement, which we need to make the code easier to read. The guard statement keeps us from making nested if statements, which makes the code difficult to read if there are many lines of code within a set curly braces. I would see a closing curly brace, and not be able to see the what the if condition is for that if clause (what's between the set of curly braces). Putting comments at the closing curly brace works, but that means I would still have to find the if condition at the beginning of the if clause. I could collapse the clause where the curly braces closes a clause, but then I have to find that collapsed clause, because Xcode scrolls the content of the editor upward, so that the beginning of the clause is hidden upwards toward the top, and I don't know how far up it is. This problem that the guard statement solves is also a problem with completion handlers, which we have to have with any asynchronous code. One approach to this problem is to avoid nested curly braces. How do I do that when I have to have asynchronous clause of code? If there is someway I can return a variable of type Result from a function the classical way instead of in a completion handler, I could avoid nested closures or clauses. One way I've found is to use the DispatchSemaphore or any statement to instructs code execution to wait for an asynchronous closure end and then return. There's something I don't like about this that I'm not sure what it is. Anytime there is a code instruction to wait, it makes me uncertain to its effectiveness. One thing that would help is if Xcode would show in the editor the beginning of collapsed code, so that when I click on the left side of the code editor to collapse a closure/clause when I'm seeing the bottom of the closure, Xcode would scroll downward so that the code editor shows me the code at the beginning of the clause, so that I wouldn't have to scroll upward to find the code that introduces the clause of code. I could file a bug report with Apple. Anyone have any contributions to any solutions to this problem? By the way, what is the Apple or Swift word for I'm calling a clause? What, for example, is the code that is enclosed between curly braces? Am I using the words clause and closure each time I used them?

I want to check if my code to cache contacts data while my iOS app is running is done well or not. Anyone have any samples I can look at. I did a search on the internet and cannot find much. Maybe code to cache any time of cache would help for me to look at. I am using Xcode 13.4.1, and my app is intended to install on iOS 12.0 up to the most current iOS version. I seem to remember a search class in one of Apple's frameworks for iOS. I don't remember if that was part of the Contacts Framework. I also will have a cache for the Contacts data that I store in CloudKit, so I take that into account to be looking for any way that might make the Contacts cache and the CloudKit cache work together.

Anyone have any words of wisdom about using NSCache and NSPurgeableData for caching in an iOS app, specifically to cache Contacts data from the device contact store? Under what conditions does this work well?

What does the following line do in the code snippet from CloudKitShare Apple sample Xcode project that I show after that?   assert(zoneID == self.zone.zoneID) // Update the server change token. // operation.recordZoneChangeTokensUpdatedBlock = { (zoneID, serverChangeToken, _) in   assert(zoneID == self.zone.zoneID)   self.setServerChangeToken(newToken: serverChangeToken) } The documentation for the assert statement says that when the project build is -0none and also in Playground, the code terminates completely, and not just exit from the current code, do I understand that correctly? The documentation seems to assume I understand C-style programming.

Is there any way I can allow my app to programmatically make a phone call?

Is there a way for me to put my iOS app in side of the shared with you?