DJSwiftHelpers

DJSwiftHelpers is a Swift library containing useful Swift extensions. It allows you to perform many tasks easily.

Integrate using SPM

Add the package git@github.com:ddaddy/DJSwiftHelpers.git to your project.

For most helpers you can import DJSwiftHelpers however for additional UIKit or SwiftUI helpers that are not extension friendly, also import DJSwiftHelpers_UIKit or import DJSwiftHelpers_SwiftUI

Integrate using Carthage

Install Carthage if not already installed

Change to the directory of your Xcode project, and Create and Edit your Cartfile and add DJSwiftHelpers:

$ cd /path/to/MyProject
$ touch Cartfile
$ open Cartfile

Add the following line to your Cartfile

github "ddaddy/DJSwiftHelpers"

Save and then run:

$ carthage update --use-xcframeworks

Once complete, drag libraries as required

• Carthage/Build/iOS/DJSwiftHelpers
• Carthage/Build/iOS/DJSwiftHelpers_Extension
• Carthage/Build/iOS/DJSwiftHelpers_SwiftUI

into the Frameworks, Libraries & Embeded Content section of your project.

If adding to an extension, select Do not embed but also add to your main iOS or watchOS app and select Embed & Sign.

Extensions Available

Array

Removes an element from an Array. If the element occurs multiple times in the array, only the first element will be removed.

remove(element: Element)

Moves an element to a new index

move(_ element: Element, to newIndex: Index)

move(from oldIndex: Index, to newIndex: Index)

Split an Array into multiple arrays of size

chunked(into size: Int) -> [[Element]]

Filters an array to return one of each item where the keyPath elements are unique

uniques<T: Hashable>(by keyPath: KeyPath<Element, T>) -> [Element]

Example:
.uniques(by: \.surname)

Filters an array to return one of each item where the combined keyPath elements are unique

uniques<T: Hashable, U: Hashable>(by keyPath: KeyPath<Element, T>, and secondKeyPath: KeyPath<Element, U>) -> [Element]

Example:
.uniques(by: \.firstName, and: \.surname)

Adds a listener to array elements

elementChangeListener(cancellables: inout [AnyCancellable], change: @escaping (Element)->())

CLLocationCoordinate2D

Determine if a location is within a bounding rect

locationIsInside(minLat:Double, maxLat:Double, minLong:Double, maxLong:Double) -> Bool

Collection (Array, Dictionary, Set etc..)

Removes the risk of indexOutOfBounds crashes.

subscript(safe index: Index) -> Element?
// array[safe: 5]

Date

Create a Date from some date elements

Date.from(year: Int, month: Int, day: Int) -> Date?

Create a Date from a date string. Be careful using this because DateFormatter's can be very expensive for performance.

Date.parse(_ string: String, format: String = "yyyy-MM-dd") -> Date?

Adds additional seconds or minutes to a Date

adding(seconds: Int) -> Date

adding(minutes: Int) -> Date

Deduct one Date from another

- (lhs: Date, rhs: Date) -> TimeInterval

Converts an iso8601 string with or without milliseconds 2020-11-11T11:39:00Z ro 2020-11-11T11:39:00.000Z

WARNING! These are expensive operations so probably best not to use in a loop

var iso8601: String

var iso8601withFractionalSeconds: String

var iso8601: Date?

var iso8601withFractionalSeconds: Date?

Decodable

UnkeyedDecodingContainer

Skips to the next container whilst iterating over an unkeyed decoding container using while !container.isAtEnd { }

skip()

@Flexible

Property wrapper that allows a Decodable var to be decoded from either a String or an Int

struct GeneralProduct: Decodable {
	var price: Double
	// These can be decoded from either String or Int
	@Flexible var intId: Int
	@Flexible var stringId: String
}

Double

Round doubles for less accurate comparisons

static func equal(_ lhs: Double, _ rhs: Double, precise value: Int? = nil) -> Bool

func precised(_ value: Int = 1) -> Double

DJSwiftHelpers

Determines if running inside an app extension or not

static var isExtension:Bool

FileManager

Fetches all contents (files & folders) in a specified file path and all subfolders

allContents(path: String) -> [URL]

Fetch contents (files & folders) in a specifies file path, none recursive

urls(for directory: FileManager.SearchPathDirectory, skipsHiddenFiles: Bool = true ) -> [URL]?
urls(for directory: URL, skipsHiddenFiles: Bool = true ) -> [URL]?

Parse a json file into the specified object type

readJSONFromFile<T: Decodable>(fileURL: URL, type: T.Type) -> T?

Gradient

A UIView subclass with a gradient background.

Can be used in a storyboard as it supports IBDesignable however to use IBDesignable from an external framework you need to add this small class to your project:

@IBDesignable
class GradientView: Gradient {
    @IBInspectable override var startColor: UIColor {get { return super.startColor }set { super.startColor = newValue }}
    @IBInspectable override var endColor: UIColor {get { return super.endColor }set { super.endColor = newValue }}
    @IBInspectable override var startLocation: Double {get { return super.startLocation }set { super.startLocation = newValue }}
    @IBInspectable override var endLocation: Double {get { return super.endLocation }set { super.endLocation = newValue }}
    @IBInspectable override var horizontalMode: Bool {get { return super.horizontalMode }set { super.horizontalMode = newValue }}
    @IBInspectable override var diagonalMode: Bool {get { return super.diagonalMode }set { super.diagonalMode = newValue }}
}

Locale

Return the emoji flag for the given Locale

var emojiFlag: String

NSMutableAttributedString

Change the colour of certain text within an NSMutableAttributedString

func setColorForText(textToFind: String, withColor color: UIColor)

String

Truncate a string by removing all characters at the position

truncated(limit: Int, position: TruncationPosition = .tail, leader: String = "") -> String

Delete a prefix if it exists

deletingPrefix(_ prefix: String) -> String

Allows you to use [8] subscript to get 1 character from a String

subscript(_ i: Int) -> String

Allows you to use [0..<9] subscript to truncate a String

subscript (r: Range<Int>) -> String

Allows you to use [0...8] subscript to truncate a String

subscript (r: CountableClosedRange<Int>) -> String

Convert a String into a Bool by looking for the relevant type texts (Yes, No, True etc..)

var bool: Bool?

Convert a String into a Double

toDouble() -> Double?

Convert a String to Data then saves it to the given URL path

save(path:URL) -> Bool

index<S: StringProtocol>(of string: S, options: String.CompareOptions = []) -> Index?

endIndex<S: StringProtocol>(of string: S, options: String.CompareOptions = []) -> Index?

indices<S: StringProtocol>(of string: S, options: String.CompareOptions = []) -> [Index]

ranges<S: StringProtocol>(of string: S, options: String.CompareOptions = []) -> [Range<Index>]

Splits a string into an array of lines

var lines: [SubSequence]

Returns a string that appears between 2 strings

func slice(from: String? = nil, to: String? = nil) -> String?

Task

Creates a recurring Task that executes until success

static func retrying(priority: TaskPriority? = nil, maxRetryCount: Int = .max, retryDelay: TimeInterval = 1, operation: @Sendable @escaping () async throws -> Success) -> Task

UIApplication

Return the top most ViewController regardless if embeded in a navigation stack or not

class getTopViewController(base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController?

Display an alert regardless of what's on the screen

class displayGlobalAlert(title:String, message:String, completion: (() -> Void)? = nil)

Dismiss back to the root view controller

class dismisstoRoot(animated:Bool, completion:(() -> Void)? = nil)

UIButton

Add an underline style to the title label

underlineText()

UIColor

Convert a hex string to a UIColor

init?(hex: String)

Find the opposite colour of a UIColor

var inverted: UIColor

UIDevice

var isPhone: Bool
var isPad: Bool
var isTV: Bool
var isCarPlay: Bool

UIFont

Specify a font weight to a dynamic font style

static func preferredFont(for style: TextStyle, weight: Weight) -> UIFont

use like:

label.font = UIFont.preferredFont(for: .title2, weight: .medium)

UIImage

Convert a String to Data then save it to the given URL path

saveAsPNG(path:URL) -> Bool

Save an image to a temporary file

tempURLForImage(named name: String) -> URL?

Resize an image

resize(width: CGFloat) -> UIImage
resize(height: CGFloat) -> UIImage
resize(size: CGSize) -> UIImage

UILabel

Adds an SFSymbol image to the beginning or end of a UILabel's text

addSFSymbol(named:String, position:UILabel.SFSymbolPosition = .beginning, fontWeight weight:UIFont.Weight = .bold, fontDescriptorDesign design:UIFontDescriptor.SystemDesign = .rounded)

UIStackView

Remove and dealloc all subviews from a UIStackView

safelyRemoveArrangedSubviews()

Add a background color to a UIStackView

addBackground(color: UIColor)

UIView

Sets up the autolayout constraints to pin a view to it's superview

pinToSuperview(with insets: UIEdgeInsets = .zero, edges: UIRectEdge = .all)

Add a border to the insied of a UIView at a specific edge

addBorder(_ edge: UIRectEdge, color: UIColor, thickness: CGFloat)

UIViewController

Displays a UIAlertController message with an "Ok" cancel button

displayAlert(title:String?, message:String?)

displayAlert(title:String?, message:String?, buttonAction:((UIAlertAction)->())?)

Add's & removes a child UIViewController to a continer view

addChild(_ child: UIViewController, in containerView: UIView)

removeChild(_ child: UIViewController)

UIWindow

Fetches the key window

var key: UIWindow?

URLRequest

Generates a URLRequest whilst automatically converting headers and body to the correct formats

init?(url:URL, headers:[String:String], postBody:[String:Any], json:Bool = true, timeout:TimeInterval = 60.0)

init?(url:URL, headers:[String:String], postString:String, timeout:TimeInterval = 60.0)

init?(url:URL, headers:[String:String], parameters:[String:String], timeout:TimeInterval = 60.0)

URLResponse

Returns the HTTP status code from a URLResponse

statusCode() -> Int?

URLSession

A URLSession that will bypass an SSL certificate check.

WARNING!! Be careful where you use this! It can be dangerous.

static var selfSignedSSLSession:URLSession

UserDefaults

Save to UserDefaults or remove it if nil

setOrDelete(value:String?, forKey key:String)
setOrDelete(value:Int?, forKey key:String)

Delete all UserDefault's for the containing bundleIdentifier

func resetDefaults()

SwiftUI

SafariActivityView

A SwiftUI view to display the share sheet with Open in Safari

Example:

.background(
	// Share button action
	SafariActivityView(isPresented: $activityPresented, url: url)
)

.onFirstAppear

A SwiftUI view modifier that executes a block of code only once during the first display of the view

.onFirstAppear(_ action: @escaping () -> ()) -> some View

License

Copyright (c) 2020 Darren Jones (Dappological Ltd.)