So your infrastructure and all is in place. But you have one problem. The OS isn’t issuing the ‘update token’ to you. This post walks you through when the problem occurs and when it doesn’t occur. Attempts I made to fix the issue, how I failed, how different use cases of Live Activity can have different out comes in terms of Completion Rate and final take. Problem ​WHEN ​When a Live Activity is started from the server, the OS doesn’t issue an update token until user locks the screen and then hits Allow....

This post isn’t meant to explain how actors work. Rather just elaborate a few tiny details. I’m often curious about the origins of things. How people met, dated or how they began their careers or founded their companies. Similarly about namings, understanding the context often gives you a foundational understanding. I give feedback in Pull Requests about variable and type names or seek advice through code-review channels. First time it occurred was when Michael Mayer at our Philly CocoaHeads (Pro Swift) Book club explained that the reduce function means “how you jam and reduce an entire array into a single value”....

After going through a final-round interviews as a senior iOS engineer, I’ve learned that technical skills alone aren’t enough. The best candidates excel across multiple dimensions: system design thinking, behavioral storytelling, code review acumen, and interview presence. This post captures the hard-won lessons from my recent interview experiences—what worked, what didn’t, and what I’d do differently next time. These aren’t theoretical tips, but practical insights that came from real feedback and reflection....

Leetcode considers this question to be easy, but it was a bit more complicated than that at first for me. Let’s try solving it three different ways: Whenever I can, I always try to do BFS. It seems much more natural. BFS - 1st solution func isSymmetricBFS(_ root: TreeNode?) -> Bool { var queue: [TreeNode?] = [] queue.append(root) while !queue.isEmpty { let temp = queue queue.removeAll() // 🔑 to make sure you don't expand on `nil` nodes — otherwise it would be endless for node in temp where node !...

Pros Performance Company keeps adding more monitoring. Your MacBook will only get slower. You will get annoyed by this. Mike Zorn's comment about this post Apple is finding more ways to restrict access to surveillance. This forces companies to restrict access to tools further because they lack the visibility into things. You pay the price… Often developers get even restricted from using tools like Charles Proxy / Proxyman, because they require adding a new root certificate which then interfere with company’s monitoring tools....

This post is based on my personal experience and is a bit oversimplified for brevity. Update: Added some of the feedback that I got from some readers. Is Software Engineering Still the Golden Ticket? What About Medicine… or Trades? A few years ago, if you asked anyone, “What should I study to make good money?” the answer was almost always: programming. Fast forward to today, and the answer isn’t so clear-cut....

This is a follow up from my previous post: The power and expressiveness of Swift ranges. For a Character Range: contain works fine let numericalRange = 1...10 numericalRange.contains(8) // true let a: Character = "a" let z: Character = "z" let alphabeticalRange = a...z alphabeticalRange.contains("k") // true for-loop and count don’t work print(numericalRange.count) // 10 print(alphabeticalRange.count) // ❌ Referencing property 'count' on 'ClosedRange' requires that 'Character' conform to 'Strideable' for num in numericalRange { print(num) // 1 2 3 4 5 6 7 8 9 10 } for char in alphabeticalRange { // ❌ Referencing instance method 'next()' on 'ClosedRange' requires that 'Character' conform to 'Strideable' print(char) } What both of those errors mean is that Swift can’t figure out what the next character is for a given character....

Learning from my product peers, TIL if you’re making an impactful change, it’s not just about the change itself—it’s about how you communicate its success. A compelling story can amplify your impact, but every great story needs a foundation of data to back it up. Logs, metrics, and dashboards are essential tools that help you visualize, quantify the problem and measure the impact of your solution from the perspectives of:...

For two (dynamic) libraries to work together they need: API compatibility ABI compatibility If you have correct function, parameter names, and are able to access it (it’s not private) then you’re good. The compiler validates if classA is using the correct Programming Interface from classB 👈 API (Application Programming Interface) Example of API usage struct House { var address = Address(streetAddress: "1100 Happy St.") } struct Person { var address = Address("1100 Sad St....

What problem do some and any solve? var x: Equatable = 10 // Error: Use of protocol 'Equatable' as a type must be written 'any Equatable' var y: Equatable = "10" // Same error You’s think the compiler should let the above compile, it rightfully doesn’t. The compiler can’t know if the associated type of x, matches with the associated type of y. So it just forbids it. Compiler just doesn’t want to be in situation where you’d try something like:...