I have an iOS app already on the App Store. I just changed my business to an LLC. I would like to change the bundle identifier in the next version of the app to reflect my new website address. What would happen if I did this? I want to decide whether it would be worth the trouble.

I'm trying to enable my app to receive a notification each time the event store changes.The documentation for EKEventStore at https://developer.apple.com/reference/eventkit/ekeventstore shows the following:static let EKEventStoreChanged: NSNotification.NameWhat does that mean? How do I use that information?

I need to be able to identify a CNContact so as to associate it with a CKRecord in a iCloud private database. If I use a non-unified contact, would the identifier be unique across all existing iOS devices so that I could store the identifier property in a record in the user's iCloud private database to identify a specific contact? The documentation says that the identifier of a CNContact stored object is unique within the device. If I use a UUID value and store it in the iCloud private database to identify the specific contact, how would I match that with the contact? I would need to save that UUID value as part of the contact object as stored in the contact store. Is that possible without saving the UUID value in the notes property of the contact. It would be better if I could store the UUID value somewhere where the user could not access it and delete or edit it. Is there a way to make the notes property of a contact inaccessible to the user where even if he/she could see it, he would not be able to change it? I'm not very familiar with the hash and hashValue properties of NSObject object. Though unlikely, would one of those properties be able to identify a contact uniquely across all existing iOS devices so that I could store it in the user's iCloud private database in order to associate a certain record in that database with a specific contact?

Is it possible to observe the iOS Contacts app or the contacts store of a device using key-value observing? How would I find out? I can't find information on it when I do a search on Google.

Sometimes it takes a long time for iCloud to begin syncing. Is there code I can use to cause iCloud to begin syncing when I want it to?

Is there a way to put code in iOS that is always watching in the background for the contact store to change? If I put it in my app, then the user can close the app, and the app won't receive notifications when the contact store changes? Is there an app extension I can use that would allow me to do this, whether that is the intent of the extension or not?

I'm having trouble finding explanations for the different cases of Data.Deallocator enumeration. It's used with the [init(bytesNoCopy:count:deallocator:) initializer to Data class] (https://developer.apple.com/documentation/foundation/data/1780455-init) Here's the different cases: Data.Deallocator. The cases are: custom free none unmap virtualMemory Anyone know a website that explains those cases briefly and simply? Or do you know what they mean off the top of your head?

I noticed that when there is a generic class, there is a , which I decided must use T for "Type". What does the S mean in . I see it in the function definition for the instance function initialize(from: S) -> (S.Iterator, UnsafeMutableBufferPointer.Index) of UnsafeMutableBufferPointer.

I found information about the ABAddressBookRegisterExternalChangeCallback(::_:) function of the Address Book Framework, but that function has been deprecated, and only works with iOS 2.0–9.0. I don't see a function in the Contacts Framework that does what that function does. Is there some way that the Contacts Framework could do something that this function provided a solution for?

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

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'm starting to look into MDM and device management for my iOS app. I'm also wondering if there is any way to allow someone on a macOS or another iOS device take control of another person's iOS device to show them how to use their device and perhaps even take control of their device while the person using the controlled device watches what the the person in control of the device is doing so he can follow along. Is there something like this that Apple already has? Is it possible to do this? If it is possible to do this, can it be done in a commonly distributed device that anyone can install from App Store and not require any additional maintenance or extra setup? I think the word I'm thinking of is "supervised". I saw that word in another post. Is it possible for one device to give control over to another user on a different device without the first device being "supervised".

I think I'm only entertaining wishful thinking, but I hope it is possible to somehow cause my iOS app or a background task to start up when the iOS device starts up, like when it was turned off and then turned back on. Does even the user of the device have a way to do this in iOS? I saw some threads saying something like this might be possible using MDM or supervised devices or kiosk mode or guided access. Those all seem to require the user or administrators to do some setting up. I want my app or background task to be able to do what I mentioned right as it comes after it is installed from App Store.

How do I get the answer id of an answer in a thread? I would like to know how to create a link to a specific answer of a post so I can refer to a specific answer rather than to the top of the page of the post. I noticed one link went to this address - https://developer.apple.com/forums/thread/67535?answerId=195112022#195112022. That's where I learned about the "answerId" item.

When I go to devices and simulators with my iPhone 8 plugged into my Mac, and then open device logs, I don't seen any recent logs. The last one was from november last year. Why are there no more recent logs? I went to my iOS device and searched for "log" in Settings, but there doesn't seem to be any setting to turn on logging. I also can't find any settings when I search for "developer" in settings. I thought I saw something in iOS that enabled me to send reports to Apple automatically on my iOS device. I don't know if that's what I really want.