Nov 9 2017
macOS 10.12, Xcode 9, Swift 4 In my post on macOS Storyboard Segues I said I’d look at sheets in more details, and now is as good a time as any. I meant to look at sheet segues in this post, but then I worked through all of the permutations of NSAlert, and 3500 words […]
Nov 7 2017
In Swift, functions are first class citizens The above does not come as a surprise. We’re using closures as callback handlers, and store them – frequently as optionals – save them, pass them around. I’ve used them as a variable in an enum: depending on the value of the enum, I return a different closure. […]
Oct 28 2017
The other day I had what I thought a very simple request: I wanted to replace one viewcontroller with another in the same window. This is something that on iOS (particularly iPhones) happens all the time; but somewhat to my suprise, macOS does not have an obvious out-of-the-box solution for this. This turns out to […]
Jul 16 2017
Xcode 9b/Swift 4/macOS 10.12 (This tutorial has been updated and tested under Xcode 9 since the previous instructions no longer worked to create new projects, which is exactly the same problem I had going from 7 to 8/10.10 to 10.11. I currently have one project that will compile and run under Xcode 8, but crash […]
Jun 30 2017
1) Constants let myConstant: Int = 0 This is, of course, not a variable. This is a constant. One of the nice things about Swift constants is that let decideLater: Bool is perfectly legitimate, as long as it is set before initialisation has ended: Combined with init(somethingElse: String){ if somethingElse = “You’ll never guess” { […]
Jun 30 2017
I found this passage in the NSManagedObjectContext documentation, and shall heed the warning henceforth: do not simply observe all managedObjectContexts, observe only your own lest you catch system-wide notifications.
Jun 25 2017
MacOS 10.12.5; Xcode 9b. I’m filing this under the ‘bug reports’ tag though I think it falls under ‘expected behaviour’, but this is a bit of a knotty problem. I had an app with a notecard, which has a title (NSTextField) and a body (NSTextView). I wanted the title to be first responder. Sadly, my […]
Jun 22 2017
This is an IB bug that, well, bugs me: If you add a portrait image to your asset catalogue and use it in an NSImageView, it gets rotated. The preview is fine, it’s fine if you add it to your project otherwise or load it from file; but from an asset catalogue, it fails.
Mar 10 2017
Find out how at #iOSCon on 31/3 in London… As the title ever-so-gently suggests, CoreData is a complex framework, offering many pitfalls for the wary and unwary alike, and which cannot be learnt in an afternoon. I’ll explore a strategy to break the task of ‘learning CoreData’ into managable chunks, based on the principle that […]
Nov 22 2017
Text field actions and NSTextFieldDelegate
(Xcode 9, Swift 4, macOS 10.12) I’ve been working with the Cocoa framework on MacOS, on and off, since 2006. That’s more than ten years. Taking a value from a text field is one of the first exercises you learn when you first explore programming… and it wasn’t until I poked at Apple’s introductory iOS […]
By Extelligent Cocoa • Wiki • • Tags: NSTextFieldDelegate