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

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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: (In fact, if we want all keyboard frame

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Posted in Swift

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

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Posted in Swift

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

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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

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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

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Posted in Swift

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: We can use the flatMap higher order function to ‘flatten’ this

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