Introduction Syncing data across a user’s own devices in a privacy-sensitive way is one of the flagship features of CloudKit. Unfortunately many agree “it isn’t as documented as it might be”, e.g. there is no sync sample from Apple, the WWDC 2014 talk and WWDC 2015 talk didn’t quite get Read more
I was researching the different ways people are implementing the part of MVC where the model notifies the controller about new data. A limitation of the delegate pattern is only one class can be the delegate, for other classes to listen then they need to use Notification Center notifications (or Read more
Saw a bunch of posts today on Stack Overflow asking how to implement this: NSArray @property backed by a NSMutableArray Hiding privately mutable properties behind immutable interfaces in Objective-C (my answer) Protect from adding object to NSMutableArray in public interface Having readonly nsarray property and nsmutable array not readonly with the Read more
Around the web and even in Apple’s WWDC 2015 Advanced NSOperations talk they say: “If we set the max concurrent operation count of an NSOperationQueue to be 1, then we essentially make our NSOperationQueue into a serial operation queue.” Sometimes developers also refer to this configuration as a first in first Read more
It’s not often you see code as disappointing as this, particularly because CloudKit is so well designed for the situation being described, but it’s actually very common. I think it happens when you have a developer with speciality in one area, trying to apply it to their understanding of how to Read more
This post is about my Stack Overflow answer. In Xcode, Window->Devices, choosing a device and clicking the up arrow in the bottom bar brings up the console and this traditionally allowed you to view output from your app when not running in the debugger, e.g. for testing background launching behaviour. Unfortunately as of Read more
If you attempt to set desiredKeys on a notificationInfo for the new iOS 10 CKRecordZoneSubscription class, saving results in the runtime error: <CKError 0x17424b610: “Invalid Arguments” (12/2006); server message = “cannot add additionalFields to this subscription type”; uuid = 4E08C616-97AA-4E9A-B584-B7972B1CD99B; container ID = “iCloud.com.x”> Which makes sense given the notification is about a zone Read more
Here are some references from around the web on how to implement CloudKit syncing. It will be added to… 9th August 2017 In the Build Better Apps with CloudKit Dashboard WWDC 2017 video at 4:30 Dave Browning presents a ToDo list app that syncs from Core Data with CloudKit 6:15. Read more
Some of the new iOS 10 features contain link-time checks, that is they are only enabled if the app was linked to the iOS 10 SDK. When working on an open source library it is necessary to debug when linked to an older SDK, e.g. iOS 9.3, on a newer device iOS, Read more
I thought it would be good to start this developer blog with some photos of how my iOS development began. At university during my Ph.D. I had been building .NET Compact Framework apps in C# for Pocket PCs, usually on iPaqs with GPS sleeves and using Wi-Fi. Then in 2007 the iPhone came out. Read more