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View animationcurves.swift
// ContentView.swift
// AnimationTimingCurve
// Created by Chris Eidhof on 25.09.19.
// Copyright © 2019 Chris Eidhof. All rights reserved.
import SwiftUI
mdiep / diff-values.swift
Created Feb 4, 2020
Diff values with Mirror and AnyHashable
View diff-values.swift
import Foundation
// Diff values for better test assertions.
// Enums and collections left as an exercise for the reader.
// A difference between two values
struct Difference: CustomStringConvertible {
let path: String
let actual: String
RuiAAPeres / opaqueEquivalent.swift
Last active Feb 18, 2020
Extension to provide an equivalent opaque UIColor to a UIColor with alpha channel. So: f(r,g,b,a) == (r,g,b,1)
View opaqueEquivalent.swift
import UIKit
public extension UIColor {
var components: (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
var red: CGFloat = 0
var green: CGFloat = 0
var blue: CGFloat = 0
var alpha: CGFloat = 0
View navigation+modal.swift
// ContentView.swift
// navigation
// Created by Thomas Ricouard on 13/10/2019.
// Copyright © 2019 Thomas Ricouard. All rights reserved.
import SwiftUI
RuiAAPeres / covariance_contravariance.swift
Last active Sep 16, 2019
Covariance and Contravariance in Swift
View covariance_contravariance.swift
import UIKit
// Based on
// > Denotes "a subtype of"
// UIButton > UIView > UIResponder > NSObject
// e.g. `UIButton` is a subtype of `UIView`
// This means that any function that takes a `UIView`, can receive a `UIButton`:
d-ronnqvist / Thoughts on removedOnCompletion in
Last active May 12, 2019
What I think is wrong with the Spark Recording Circle code and why
View Thoughts on removedOnCompletion in

There was [a tweet][tweetSoto] a couple of days ago that resulted in a discussion/question about what it wrong with the usage of removedOnCompletion = NO in the [SparkRecordingCircle code][code] for that [Subjective-C post][post].

We all kept saying that the explanation doesn't fit in a tweet, so here is my rough explanation about the issues.

But, let me first say that I think that the Subjective-C articles are reallt cool and useful to learn from. This is trying to reason about the general usage of removedOnCompletion = NO, using that code as an example, since that was what was discussed on twitter.

The root problem, as [Nacho Soto pointed out][rootProblem], is that removedOnCompletion = NO in combination with fillMode = kCAFillModeForwards is almost always used when you are not updating the model layer. This means that after the animation has finished, what you see on screen is not reflected in the property of the layer. The biggest issue that this can cause is that all the

View Signal+Extensions.swift
// Signal+Extensions.swift
// Khan Academy
// Created by Nacho Soto on 10/1/15.
// Copyright © 2015 Khan Academy. All rights reserved.
import ReactiveCocoa
JadenGeller / List Comprehension.swift
Last active Mar 17, 2018
Nondeterministic Computation with Arrays
View List Comprehension.swift
// In languages like Python and Haskell, we can write list comprehension syntax like
// super simply to generate complex lists. Below, for example, we find all numbers that are
// the product of two sides of a triangle.
// [a * b | a <- [1..10], b <- [1..10], c <- [1..10], a * a + b * b == c * c]
// Why is this called nondeterministic computation? Because we essentially try ALL possible combinations
// of these values (a,b) and--you can imagine--run them all simultanously and get the result that matches the predicate.
// Now, obviously, this doesn't all happen at the same time, but that's the idea behind the nondeterminism.
// Let's examine how we can get a similiar result in Swift! We'll start super simple and work
JaviSoto / NibInstantiable.swift
Last active Sep 1, 2016
RSwift Fabric Extensions
View NibInstantiable.swift
import UIKit
import Rswift
struct NibResource: NibResourceType {
let name: String
let bundle: NSBundle
init(name: String, bundle: NSBundle = NSBundle.mainBundle()) { = name
self.bundle = bundle
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