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 4 2017
(OSX 10.11, Xcode 8) Create a new app: drop an NSImageView and two buttons into the storyboard, set up an outlet for the image view and two actions – zoomIn and zoomOut for the buttons. 0) Not recommended: scaleUnitSquare @IBAction func zoomOut(_ sender: AnyObject) { imageView.scaleUnitSquare(to: NSSize(width: 0.4, height: 0.4)) } This works perfectly fine. […]
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 2 2017
This image captures my experience with a lot of tutorials: they don’t tell you *how* to get from A to B, and if you don’t already have a good idea of what you’re trying to achieve (because you can program and just need to learn a new language/IDE/framework) chances are you’ll fail to learn unless […]
Jan 2 2017
By mere chance I’ve come across the following list of Objective C tutorials on YouTube. (The author also has a couple of introductory Swift tutorials and seems to be continuing his tutorials in Swift, though they have not been updated recently, as far as I can see. He has, as far as I can see, […]
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 […]
Dec 30 2016
Terry Pratchett uses the term ‘Extelligence’ for the habit of storing information outside oneself. This Blog mainly exists to stand on the shoulders of giants and to store information in an accessible manner so that once I have solved a problem, I do not have to solve it again. ‘And because WordPress is a decent […]
Dec 26 2016
Xcode 8, macOS 10.11 (I will test this with 10.12. Settings mostly borrowed from https://littlebitesofcocoa.com/89-custom-xcode-file-templates. Credit for working this out mainly goes to them, but I wanted to add a few additional observations. Also, I’m working on macOS rather than iOS.) When you are using certain classes a lot in your projects, having them as […]
Jan 5 2017
Application Design: Enums (with bonus tuple)
In the zoom example app, to make life easier for me, I went for a cyclical zoom: 2x magnification, 3x magnification, 1x magnification. When Apple first announced Swift, I liked many things about it, but the thing that made me swoon was enums. Swift enums are wonderful tools to shape your application flow. Here, we […]
By Extelligent Cocoa • Application Design, Coding Meta • • Tags: enums, responsibilities, tuples, zoom