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extension AnyPublisher where Failure: Error {
    struct Subscriber {
        fileprivate let send: (Output) -> Void
        fileprivate let complete: (Subscribers.Completion<Failure>) -> Void

        func send(_ value: Output) { self.send(value) }
        func send(completion: Subscribers.Completion<Failure>) { self.complete(completion) }
    }

    init(_ closure: (Subscriber) -> AnyCancellable) {

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import Combine
import ObjectiveC
import UIKit

private var eventSubjectKey = "viewcontroller_lifecycle_subject"
private var swizzlingPerformed = false

private final class LifecycleSubjectBag: NSObject {
    let viewDidLoadSubject = PassthroughSubject<Void, Never>()
    let viewWillAppearSubject = PassthroughSubject<Bool, Never>()

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New Build System Tricks

Command Line

alias xcbuild=$(xcode-select -p)/../SharedFrameworks/XCBuild.framework/Versions/A/Support/xcbuild
# THIS DOESNT WORK YET: xcbuild openIDEConsole  # … then switch to Xcode ➡️
xcbuild showSpecs
xcbuild build <foo.pif> [—target <target>]

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If you work on a Swift project that follows the Model-View-ViewModel (MVVM) architecture or similar, you may want to jump to counterpart in Xcode from your view to your model, and then to your view model. (ie. by using Ctrl+Cmd+Up and Ctrl+Cmd+Down).

You can do this in recent versions of Xcode by setting a configuration default.

From a terminal, just type this command and press Enter:

defaults write com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes -array-add "ViewModel" "View"

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//
//  DeallocTests.swift
//
//  Created by Rogerio de Paula Assis on 7/14/19.
//  Extracted from this CCH Melbourne talk: https://www.youtube.com/watch?v=514rJ1efv84
//

import XCTest

class DeallocTests: XCTestCase {

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public protocol OptionalType {
    associatedtype Wrapped
    var value: Wrapped? { get }
}

extension Optional: OptionalType {
    public var value: Wrapped? {
        return self
    }
}

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import UIKit
import CoreData
import Playgrounds
import RxSwift
import RxCocoa

@objc(ProductEntity)
final class ProductEntity: NSManagedObject {
    @NSManaged public var uuid: String?
    @NSManaged public var title: String?

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LLDB Cheat Sheet

A complete gdb to lldb command map.

Print out

• Print object

(lldb) po responseObject
(lldb) po [responseObject objectForKey@"state"]

• p - Print primitive type

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//
//  EmitWhile.swift
//
//  Created by Daniel Tartaglia on 09/06/2018.
//  Copyright © 2018 Daniel Tartaglia. MIT License.
//

import RxSwift

/**

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// This example shows how higher-kinded types can be emulated in Swift today.
// It acheives correct typing at the cost of some boilerplate, manual lifting and an existential representation.
// The technique below was directly inspired by the paper Lightweight Higher-Kinded Polymorphism
// by Jeremy Yallop and Leo White found at http://ocamllabs.io/higher/lightweight-higher-kinded-polymorphism.pdf

/// `ConstructorTag` represents a type constructor.
/// `Argument` represents an argument to the type constructor.
struct Apply<ConstructorTag, Argument> {
    /// An existential containing a value of `Constructor<Argument>`
    /// Where `Constructor` is the type constructor represented by `ConstructorTag`