I'm looking at this Swift documentation on Literal Expression, particularly the #dsohandle literal. It's the last line in the table. I can't find any documentation by Apple for "dynamic shared object (DSO) handle", as it says in the very right-most column. When I do a search for "dynamic shared object", I find information for technology by other companies. Anyone have anything you can tell me about this?

In the context of OperationQueue, specifically in the documentation for the waitUntilAllOperationsAreFinished(), addOperation(Operation), and addOperation(()-Void) functions, what does "receiver" refer to? Does it refer to the instance of OperationQueue that calls the function?

How do I turn on that setting in Xcode that allows me to see how the beginning of a loop or if statement lines up with the ending of the loop as far as the number of tabs or the distance from the left border of the code editor. I have seen this on by default before. I don't know what it's called, so I don't know hot to search for it in Xcode help or on the internet or on forums.

My DerivedData folder is supposed to be in Library/Developer/Xcode/DerivedData. Why is it not there. Is there a setting in Finder that is hiding files from me? Did my Xcode get installed with folders in a different location than usual?

Recently, the items in Project navigator of all my projects show as black instead of in color like before. What's causing this. I also noticed other changes when I create a new iOS app project.

For some reason, my Xcode project won't run. I tried clicking on the run button, and I tried clicking on the Run option in the Product Menu. I also clicked on the Clean build folder under the Product menu.

For some reason, when I set UITableViewController navigationItem.searchController with a UISearchController, it doesn't take it. Here is my code: let searchController = UISearchController(searchResultsController: nil) if #available(iOS 11.0, *) { print("?", navigationItem.searchController) print("!", searchController) navigationItem.searchController? = searchController print("?", navigationItem.searchController) } else { tableView.tableHeaderView = searchController.searchBar } Here is the debug window: ? nil ! <UISearchController: 0x105077600> ? nil

On Apple's documentation of the Contacts Framework for iOS and Swift on their developer website, there is a section called Change History Data. It consists of a list of classes and one protocol. The protocol seems to be the most important item of the list - the CNChangeHistoryEventVisitor protocol. The protocol apparently has instance methods each of which use one of those classes listed. Where do I find documentation to use this protocol and these classes? Anyone ever use these before? Here's the list: class CNChangeHistoryAddContactEvent class CNChangeHistoryAddGroupEvent class CNChangeHistoryAddMemberToGroupEvent class CNChangeHistoryAddSubgroupToGroupEvent class CNChangeHistoryDeleteContactEvent class CNChangeHistoryDeleteGroupEvent class CNChangeHistoryDropEverythingEvent class CNChangeHistoryEvent class CNChangeHistoryFetchRequest class CNChangeHistoryRemoveMemberFromGroupEvent class CNChangeHistoryRemoveSubgroupFromGroupEvent class CNChangeHistoryUpdateContactEvent class CNChangeHistoryUpdateGroupEvent protocol CNChangeHistoryEventVisitor

I noticed that when my app changes the contact store, the CNContactStoreDidChange notification fires in my app. How do I check if the notification fired because my app changed it. Is there a way to know which app made the change to the contact store. I need to know so I can write code to run only if the contact store was changed by another app instead of my app.

I am writing an iOS app using Swift and Xcode 13.1. I am using the Contacts Framework, and I read that each app has a default contacts container, and the default container in an app can be different than the default container in another app, and there is not a default container for the entire device. What determines which is the default container for the app made by an Xcode project? I didn't set the default container for my app and somehow the contacts container for a Google account became the default contacts container for my app. How do I use code to set the default contacts container for my app? How do I find out which is the default container of Apple's Contacts app that comes with iOS? I would like to set my app's default contacts container to the same default container of Apple's Contacts app, if that is the contacts container that is saved on iCloud. If not, I would like to set my app's default contacts container to the contacts container that is saved in iCloud. I assume that only one contacts container is saved on iCloud.

When I use the Contacts Framework with Swift for iOS 15 using Xcode 13, when I use CNContactStore instance method unifiedContacts(matching:keysToFetch:), what happens to those CNContact objects that are not linked with any other CNContact objects, would they be returned as non-unified contacts, or would they be left out since they are non-unified contacts?

Anyone ever use CNFetchResult successfully? I find nothing on the internet, on stackoverflow, and in Apple Developer Forums. The only thing I have found is Apple Documentation for it. It says CNFetchResult is a Generic Class. What exactly does that mean. I found an explanation that gives its definition, but the rest of the explanation is very long winded.

I signed out of iCloud in the iPhone 8 Simulator, and it has shown the screen saying "Removing iCloud data..." showing that it's working for a few hours now. When it did this before, I shut down the Simulator and when I opened the Simulator again, it shows that it never logged out of iCloud.

I'm getting the following error messages:CoreData: annotation: Failed to load optimized model at path '/var/containers/Bundle/Application/0E3DF5FB-DA57-4A63-98FE-59E2961C6F50/Routes.app/GoogleMaps.bundle/GMSCacheStorage.momd/StorageWithTileProto.omo'2020-01-11 17:19:50.885657-0600 Routes[1913:394464] [error] fault: One or more models in this application are using transformable properties with transformer names that are either unset, or set to NSKeyedUnarchiveFromDataTransformerName. Please switch to using "NSSecureUnarchiveFromData" or a subclass of NSSecureUnarchiveFromDataTransformer instead. At some point, Core Data will default to using "NSSecureUnarchiveFromData" when nil is specified, and transformable properties containing classes that do not support NSSecureCoding will become unreadable.. . .CoreData: warning: Property 'value' on Entity 'GMSCacheProperty' is using nil or an insecure NSValueTransformer. Please switch to using "NSSecureUnarchiveFromData" or a subclass of NSSecureUnarchiveFromDataTransformer instead.. . .2020-01-11 17:20:08.491131-0600 Routes[1913:394093] Can't end BackgroundTask: no background task exists with identifier 13 (0xd), or it may have already been ended. Break in UIApplicationEndBackgroundTaskError() to debug.I don't know what the problem is because I am not using any CoreData Attributes of type Transformable nor is there any code in my project about anything transformable. I have searched with Google for this error, but have not found a solution that works.

How would I check for a return key tap on the keyboard when a text view is first responder? So far I think I have to check the text parameter in the shouldChangeTextIn callback method of UITextViewDelegate. How would I check whether text is a return?