Skip to content

Instantly share code, notes, and snippets.

Last active July 10, 2018 19:24
Show Gist options
  • Save natecook1000/151d8de423eb77fc87bf to your computer and use it in GitHub Desktop.
Save natecook1000/151d8de423eb77fc87bf to your computer and use it in GitHub Desktop.
NSHipster New Year's 2016

Greetings and salutations, NSHipsters!

As the year winds down, it's a tradition here at NSHipster to ask you, dear readers, to offer up your favorite tricks and tips from the past year as gifts to your fellow hipsters. With iOS 9, El Capitan, brand new watch- and tvOS's, and the open-sourcing of some minor Apple-related tech, there's bound to be lots to share.

Submit your favorite piece of Swift or @objc trivia, helpful hints, unexpected discoveries, useful workarounds, useless fascinations, or anything else you found cool this year. Just comment below!

If you need inspiration, try the list from last year, or from the year before, or from the year before that.

새해 복 많이 받으세요! 🎆

Copy link

The addition of the where clause has made my code simple and compact while remaining readable. In addition, it has a broad application in Swift, so that it can be applied in nearly any kind of control-flow statement, such as for loop, while loop, if, guard, switch, and even in extension declarations. One simple way I like to use it is in my prepareForSegue method:

if let segueID = segue.identifier where segueID == "mySegue" {

The combo of unwrapping and performing a condition check is most commonly where I use the where clause. The where clause is not going to change your life, but it should be an easy and useful addition to your Swift skills.

Copy link

jcavar commented Dec 30, 2015

Additional type safety with phantom types:

struct Kilometer {}
struct Meter {}

struct DistanceT<T> {
    private let value: Int

    init(value: Int) {
        self.value = value

func +<T>(left: DistanceT<T>, right: DistanceT<T>) -> DistanceT<T> {
    return DistanceT(value: left.value + right.value)

extension Int {
    var km: DistanceT<Kilometer> {
        return DistanceT<Kilometer>(value: self)
    var m: DistanceT<Meter> {
        return DistanceT<Meter>(value: self)

let distanceKilometers =
let distanceMeters = 15.m
let newDistance = distanceKilometers + distanceKilometers // Ok
let newDistance = distanceKilometers + distanceMeters // Compiler error

Copy link

orta commented Jan 2, 2016

Copy link

How to tell if your app is running under UI Tests:

UI Tests:

class UITests: TestCase {
    let app = XCUIApplication()

    override func setUp() {
        app.launchArguments = ["UI-TESTING"]

App Code:

func UITesting() -> Bool {
    return NSProcessInfo.processInfo().arguments.contains("UI-TESTING")

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment