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Composed Protocol Dependency Injection (CPDI) Pattern

This dependency injection pattern uses native Swift language features to provide a safe, concise, deterministic, and intentional approach to dependency injection.

Overview

The primary Swift language feature that drives CPDI is called "protocol composition". This feature allows you to create a type alias from any combination of protocols. For example:

protocol Car {

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// Credit: Michael LaRandeau (@mlarandeau)

import SwiftUI
import Combine
import PlaygroundSupport

class ValueProvider: ObservableObject {
    
    private let didSetSubject = CurrentValueSubject<Int, Never>(0)
    

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/*
This example shows how a simple property wrapper can be declared and initialized.
*/

@propertyWrapper
struct ExampleA<Value> {
    private var value: Value
    
    var wrappedValue: Value {
        get { value }

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//: Playground - noun: a place where people can play

extension Array where Element: Comparable {
    /**
     Compares array with passed array and returns the differences. Warning: Must be a set of data (no duplicate values)
     - Parameter with: The new array to compare to the existing array
     - Returns: A tuple with an array of added items and an array of removed items.
     */
    func diff(with array: Array) -> (added: Array, removed: Array) {
        let originalArray = self.sorted()

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import Foundation
import PlaygroundSupport

//class that allows fully-swift weak reference storage for arrays/dictionaries
class Weak<T> {
    private weak var _object: AnyObject?
    var object: T? { return _object as? T }
    
    init(object: T) {
        _object = object as AnyObject

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import Foundation
import PlaygroundSupport

//class that allows fully-swift weak reference storage for arrays/dictionaries
class Weak<T> {
    private weak var _object: AnyObject?
    var object: T? { return _object as? T }
    
    init(object: T) {
        _object = object as AnyObject

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//
//  StandardTooltip.swift
//
//  Created by Albert Bori on 11/20/17.
//

import Foundation

@objc
class StandardTooltip: NSObject {

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//
//  StackCollectionView.swift
//
//  Created by Albert Bori on 6/23/17.
//

import UIKit

@IBDesignable
class StackCollectionView: UIView {

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LINQ GroupByDate Reporting Extension

This IQueryable<T> extension saves a bit of time when writing a report that groups results by date. You can specify which timeframes to group by (day, week, month, year), or use the default automatic thresholds.

This method also accepts and corrects null dates based on the available results. It does this by performing a simple query to grab the starting date, if it's missing, before running the main report query.

Sample Usage

public class OrderCountRow: ReportingExtensions.ReportRow

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import UIKit
import MBProgressHUD

class ImageViewController: UIViewController, UIScrollViewDelegate {
    
    @IBOutlet weak var scrollView: UIScrollView!
    
    var imageURL: String?
    private var imageView: UIImageView!