Single-issue posts dealing with a particular class or problem.
Jan 15 2017
Xcode 8, macOS 10.12, Swift 3.0 In Part 1 of this tutorial, we created an outlineView that, thanks to a SourceListItem protocol, was indefinitely flexible: you can have different classes on several levels, or indefinite levels (though it is probably wise to limit this programatically so you don’t nest too deep. It all depends on […]
Jan 15 2017
Swift 3, macOS 10.12 class Food { var name: String = “” init(name: String){ self.name = name } } let chocolate = Food(name: “Chocolate”) let spinach = Food(name: “Spinach”) let greenTea = Food(name: “Green Tea”) let favouriteThings = [greenTea, chocolate, greenTea, spinach, greenTea] If your element conforms to the equatable protocol or inherits from NSObject, […]
Jan 12 2017
macOS 10.12, Xcode 8.0, Swift 3 Storyboard segues make it exceedingly easy to create popovers, but sometimes you want to customise your popovers a bit more, for instance make windows detachable. When building interfaces the old-fashioned way with xib files or in code, you would use the NSPopoverDelegate protocol and wire things up appropriately. Storyboards […]
Jan 10 2017
OSX 10.12, Xcode 8.0 I’m not entirely certain under which circumstances this is useful, but [code language=”plain”]class invisibleWindowController: NSWindowController { override func windowDidLoad() { super.windowDidLoad() self.window?.isOpaque = false self.window?.backgroundColor = NSColor.clear } }[/code] is a thing of beauty. If the view in the window’s contentViewController overrides override func draw(_ dirtyRect: NSRect), the effect is […]
Jan 8 2017
Credit for extending Selector goes entirely to Andyy Hope (@AndyyHope) who posted this article on Medium: He looks at the problem of Swift selector syntax being somewhat unwieldy, and turns it into [code language=”plain”]fileprivate extension Selector { static let buttonTapped = #selector(ViewController.buttonTapped(_:)) }[/code] Thanks to fileprivate, you don’t get namespacing conflicts. Awesome. So I […]
Jan 4 2017
Xcode 8.0, macOS 10.11 (This is Part 1 of 3; in which we will create an NSOutlineView with a flexible data structure that can be used for simple trees and for structures like the one below which contain a number of different, unrelated items. Part 2 will deal with inserting and deleting items, and reacting […]
Jan 3 2017
(Xcode 8.0, OSX 10.11) For the app I am currently working on, I wanted to implement the following: – user can import a picture – user can change their mind and undo their choice, up to a point – I don’t need to store a million images in my app And there are many ways […]
Jan 1 2017
Xcode 8.0, Swift 3, OSX 10.11 The following is a good example of creating your own operators. In the two years since first writing this, I have not found an actual use for this, but it appears to be a common operator in Ruby, and has been implemented several times in Swift. My example code […]
Dec 30 2016
(macOS 10.11; Xcode 8.0) This post deals with colouring buttons. Some of the techniques described are against Apple’s InterfaceDesign guidelines; others are simply against the rules of good taste. This post is an exploration of what is possible and will provide a handy reference in the future if I ever think ‘oh, I wish I […]
Jun 30 2017
Variable Types
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” { […]
By Extelligent Cocoa • Wiki •