If you’ve come to Swift from a language that doesn’t use optionals, you might find the concept a little strange and the syntax unfamiliar at first. Sometimes it helps to learn the unfamiliar with something familiar – in my lightning tour…
Blog Archives
Get a continent from longitude-latitude
For a project I’m working on I needed to know if a point (latitude,longitude) was in a continent, and if so, which one! To do this, first I set up a Continent enum to work with, making it a String…
Getting the keyboard height
Some time ago I answered a question in StackOverflow comparing the keyboard height on the iPhone X and the iPhone 8: I got these heights by: 1. Adding an observer of the UIResponder.keyboardWillShowNotification notification: [sourcecode language=”javascript”] NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object:…
Lightning tour of closures in Swift
Check out this video tutorial with a lightning tour of closures in Swift. It covers: Functions as data types Basic closure syntax Trailing closures If you’re interested in more of these sorts of videos, I’ll be posting frequently over on…
Overloading functions with default parameter values
Here’s a Swifty conundrum for you! First a quick recap. Here’s a simple function with no parameters. Call it and “Hello World” will print to the console. Here’s another function with the same name. This time it has a parameter…
Lightning tour of functions in Swift
Check out this video tutorial with a lightning tour of functions in Swift. It covers: Parameter default values Optional function parameters Overloading a function If you’re interested in more of these sorts of videos, I’ll be posting frequently over on the…
Tagged with: functions, optional parameters, overloading, parameter defaults, parameters
Posted in Swift
Posted in Swift
iOS Video Course is live!
After many months of work, my video course iOS Development with Swift in Motion has recently launched over at Manning Publications. If you’re interested in taking on iOS Development, but aren’t sure if you’re ready to take the plunge, I’d…
flatMap vs compactMap
In Swift 4.1, the flatMap function was divided into two functions. One kept the same name: flatMap This method flattens a sequence. Let’s say we have a two-dimensional array: [sourcecode language=”javascript”] let a = [[0,1,2],[3,4,5]] [/sourcecode] We can use the…
Xcode 10 keyboard shortcuts cheat sheet
Getting adjusted to keyboard shortcuts takes some work, but they can boost your productivity significantly. I’ve put together a cheat sheet for a number of frequently used keyboard shortcuts in Xcode 10. I recommend you print it out, stick it…
The Mysterious Case of the Status Bar
All I wanted was two things for my status bar: I wanted it to have white text by default as it was going to be on a dark background I wanted to be able to hide it temporarily every now…
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