SwiftyUtils

SwiftyUtils groups all the reusable code that we need to ship in each project. This framework contains: - Extensions - Protocols - Structs - Subclasses

Working on iOS, macOS, tvOS, and watchOS, everything has been made to be easy to use! :tada:

Contents

Check out the repository to find examples / tests for each feature.

Swift, Foundation and CoreGraphics extensions:

• Array
• Bundle
• CGFloat
• CGPoint
• CGRect
• CGSize
• Color
• Date
• Dictionary
• Double
• FileManager
• Int
• MutableCollection
• NotificationCenter
• NSAttributedString
• NSLayoutConstraint
• NSMutableAttributedString
• NSObject
• NSRange
• ReusableFormatters
• Sequence
• String
• Timer
• URL
• UserDefaults

SwiftUI:

• UIElementPreview

SwiftUI Extension:

• BindingExtension

UIKit Extensions:

• UIAlertController
• UIApplication
• UIButton
• UICollectionView
• UICollectionViewCell
• UIDevice
• UIFont
• UIImage
• UILabel
• UIScreen
• UISlider
• UIStoryboard
• UISwitch
• UITableView
• UITextField
• UITextView
• UIView
• UIViewController

UIKit Protocols:

• NibLoadable
• NibOwnerLoadable

AppKit Extensions:

• NSView

Protocols:

• Injectable
• Occupiable
• Then

PropertyWrappers:

• UserDefaultsBacked

Others:

• UnitTesting
• UITesting
• SystemUtility - Shell

Swift, Foundation and CoreGraphics Extensions

Array extension

Safely access to an element:

var array = [1, 2, 3]
print(array[safe: 0]) // Optional(1)
print(array[safe: 10]) // nil

Find all the index of an object:

var array = [1, 2, 3, 1]
print(array.indexes(of: 1)) // [0,3]

Get index of first / last occurrence of an object:

var array = [1, 2, 3, 1]
print(array.firstIndex(of: 1)) // Optional(0)
print(array.lastIndex(of: 1)) // Optional(3)

Remove an object:

var array = [1, 2, 3]
myArray.remove(object: 2)
print(myArray) // [1, 3]
myArray.remove(objects: [1, 3])
print(myArray) // []

Remove all the duplicates:

var array = [0, 0, 1, 1, 2]
array.removeDuplicates()
print(array) // [0,1,2]

let array = [0, 0, 1, 1, 2]
let newArray.removedDuplicates()
print(newArray) // [0,1,2]

Remove all instances of an item:

var array = [0, 0, 1, 1, 2]
array.removeAll(0)
print(array) // [1,1,2]

let array = [0, 0, 1, 1, 2]
let newArray = array.removedAll(0)
print(newArray) // [1,1,2]

Check if an array is a subset of another array:

var array = [1, 2, 3]
print(array.contains([1, 2])) // true
print(array.contains([5])) // false

Determine if an array contains an object:

var array = [1, 2, 3]
print(array.contains(1)) // true
print(array.contains(11)) // false

Get intersection and union of two arrays:

var myArray = [1, 2, 3]
print(array.intersection(for: [1, 5, 3])) // [1, 3]
print(array.union(values: [5, 6])) // [1, 2, 3, 5, 6]

Get difference between two arrays:

var array = [1, 2, 3]
print(array.difference(with: [1])) // [2, 3]

Split into chunk of a specific size:

var array = [1, 2, 3, 4]
print(array.split(intoChunksOf: 2)) // [[1, 2], [3, 4]]

Bundle extension

Get bundle information:

Bundle.main.appName
Bundle(url: url)?.appName

Bundle.main.displayName
Bundle(url: url)?.displayName
Bundle.main.appVersion
Bundle(url: url)?.appVersion
Bundle.main.appBuild
Bundle(url: url)?.appBuild
Bundle.main.bundleId
Bundle(url: url)?.bundleId
Bundle.main.schemes
Bundle(url: url)?.schemes
Bundle.main.mainScheme
Bundle(url: url)?.mainScheme
Bundle.main.isInTestFlight
Bundle(url: url)?.isInTestFlight

CGFloat extension

Create a CGFloat from a Float or an Integer:

let imageViewTop = 15.f

CGPoint extension

Add two

CGPoint

var point1 = CGPoint(x: 10, y: 10)
let point2 = CGPoint(x: 10, y: 10)
print(point1 + point2) // CGPoint(x: 20, y: 20)

point1 += point2
print(point1) // CGPoint(x: 20, y: 20)

Substract two

CGPoint

var point1 = CGPoint(x: 10, y: 10)
let point2 = CGPoint(x: 10, y: 10)
print(point1 - point2) // CGPoint(x: 0, y: 0)

point1 -= point2
print(point1) // CGPoint(x: 0, y: 0)

Multiply a

CGPoint

var point1 = CGPoint(x: 10, y: 10)
print(point1 * 2) // CGPoint(x: 20, y: 20)

point1 *= 2
print(point1) // CGPoint(x: 20, y: 20)

CGRect extension

Get the origin's x and y coordinates:

aRect.x // instead of aRect.origin.x
aRect.y // instead of aRect.origin.y

Change one property of a

CGRect

let rect = CGRect(x: 10, y: 20, width: 30, height: 40) 
let widerRect = rect.with(width: 100) // x: 10, y: 20, width: 100, height: 40
let tallerRect = rect.with(height: 100) // x: 10, y: 20, width: 30, height: 100
let rectAtAnotherPosition = rect.with(x: 100).with(y: 200) // x: 100, y: 200, width: 30, height: 40
let rectWithAnotherSize = rect.with(size: CGSize(width: 200, height: 200)) // x: 10, y: 20, width: 200, height: 200
let rectAtYetAnotherPosition = rect.with(origin: CGPoint(x: 100, y: 100)) // x: 100, y: 100, width: 30, height: 40

CGSize extension

Add two

CGSize

var size1 = CGSize(width: 10, height: 10)
let size2 = CGSize(width: 10, height: 10)
print(size1 + size2) // CGSize(width: 20, height: 20)

size1 += size2
print(size1) // CGSize(width: 20, height: 20)

Substract two

CGSize

var size1 = CGSize(width: 10, height: 10)
let size2 = CGSize(width: 10, height: 10)
print(size1 - size2) // CGSize(width: 0, height: 0)

size1 -= size2
print(size1) // CGSize(width: 0, height: 0)

Multiply a

CGSize

var size1 = CGSize(x: 10, y: 10)
print(size1 * 2) // CGSize(width: 20, height: 20)

size1 *= 2
print(size1) // CGSize(width: 20, height: 20)

Color extension

Create colors with HEX values:

let myUIColor = UIColor(hex: "233C64") // Equals 35,60,100,1
let myNSColor = NSColor(hex: "233C64") // Equals 35,60,100,1

Access to individual color value:

let myColor = UIColor(red: 120, green: 205, blue: 44, alpha: 0.3)
print(myColor.redComponent) // 120
print(myColor.greenComponent) // 205
print(myColor.blueComponent) // 44
print(myColor.alpha) // 0.3

Get lighter or darker variants of colors instances:

let color = UIColor(red: 0.5, green: 0.5, blue: 1.0, alpha: 1.0)
let lighter = color.lighter(amount: 0.5)
let darker = color.darker(amount: 0.5)
// OR
let lighter = color.lighter()
let darker = color.darker()

let color = NSColor(red: 0.5, green: 0.5, blue: 1.0, alpha: 1.0)
let lighter = color.lighter(amount: 0.5)
let lighter = color.lighter()
// OR
let darker = color.darker(amount: 0.5)
let darker = color.darker()

Data Extension

Initialize from hex string:

let hexString = "6261736520313020697320736F2062617369632E206261736520313620697320776865726520697427732061742C20796F2E"
let data = Data(hexString: hexString)

Get hex string from data:

let data = Data(...)
let string = data.toHexString()
// string = "6261736520313020697320736F2062617369632E206261736520313620697320776865726520697427732061742C20796F2E" if using previous example value

Get UInt8 Array from data:

let data = Data(...)
let array = data.bytesArray

Map Data to Dictionary:

let dictionary = try data.toDictionary()

Date extension

Initialize from string:

let format = "yyyy/MM/dd"
let string = "2015/03/11"
print(Date(fromString: string, format: format)) // Optional("2015/03/11 00:00:00 +0000")

Convert date to string:

let now = Date()
print(now.string())
print(now.string(dateStyle: .medium, timeStyle: .medium))
print(now.string(format: "yyyy/MM/dd HH:mm:ss"))

See how much time passed:

let now = Date()
let later = Date(timeIntervalSinceNow: -100000)
print(later.days(since: now)) // 1.15740740782409
print(later.hours(since: now)) // 27.7777777733571
print(later.minutes(since: now)) // 1666.66666641732
print(later.seconds(since: now)) // 99999.999984026

Check if a date is in future or past:

let later = Date(timeIntervalSinceNow: -100000)
print(now.isInFuture) // false
print(now.isInPast) // true

Dictionary extension

Check if a key exists in the dictionary:

let dic = ["one": 1, "two": 2]
print(dic.has(key: "one")) // True
print(dic.has(key: "1")) // False

Map Dictionary to Data:

let data = try dictionary.toData()

Easily get union of two dictionaries:

let dic1 = ["one": 1, "two": 2]
let dic2 = ["one": 1, "four": 4]

let dic3 = dic1.union(values: dic2)
print(dic3) // ["one": 1, "two": 2, "four": 4]

map

let dic = ["a": 1, "b": 2, "c": 3]
let result = dic.map { key, value in
    return (key.uppercased(), "\(value * 2)")
}
print(dic) // ["A": "2, "B": "4", "C": "6"]

flatMap

let dic = ["a": 1, "b": 2, "c": 3]
let result = dic.flatMap { key, value -> (String, String)? in
    if value % 2 == 0 {
        return nil
    }
    return (key.uppercased(), "\(value * 2)")
}
print(dic) // ["A": "2, "C": "6"]

Get difference of two dictionaries:

let dic1 = ["one": 1, "two": 2]
let dic2 = ["one": 1, "four": 4]
difference(with: dic1, dic2) // ["two": 2, "four": 4]

Merge several dictionaries:

let dic1 = ["one": 1, "two": 2]
let dic2 = ["three": 3, "four": 4]
var finalDic = [String: Int]()
finalDic.merge(with: dic1, dic2)
print(finalDic) // ["one": 1, "two": 2, "three": 3, "four": 4]

Double extension

Get the time interval for a number of milliseconds, seconds, hour, or days:

print(1.second) // 1
print(1.minute) // 60
print(1.hour) // 3600
print(1.2.seconds) // 1.2
print(1.5.minutes) // 90.0
print(1.5.hours) // 5400.0
print(1.3.milliseconds) // 0.0013
print(0.5.day) // 43200
print(1.day) // 86400
print(2.day) // 172800

Formatted value with the locale currency:

print(Double(3.24).formattedPrice) // "$3.24"
print(Double(10).formattedPrice) // "$10.00"

FileManager extension

Get documents directory url following the os:

FileManager.document
// OR
FileManager.default.document

Create a new directory:

FileManager.createDirectory(at: directoryUrl)
// OR
FileManager.default.createDirectory(at: directoryUrl)

Delete contents of temporary directory

FileManager.removeTemporaryFiles()
// OR
FileManager.default.removeTemporaryFiles()

Delete contents of documents directory

FileManager.removeDocumentFiles()
// OR
FileManager.default.removeDocumentFiles()

Int extension

var myNumber = -33
print(myNumber.isEven) // false
print(myNumber.isOdd) // true
print(myNumber.isPositive) // false
print(myNumber.isNegative) // true
print(myNumber.digits) // 2

Round to the nearest / nearest down / nearest up:

var value = 17572
print(value.nearestDozens) // 17570
print(value.nearestHundreds) // 17600
print(value.nearestThousands) // 18000
print(value.nearest(to: 1000) // 18000

value = 17578
print(value.nearestBelowDozens) // 17570
print(value.nearestBelowHundreds) // 17500
print(value.nearestBelowThousands) // 17000
print(value.nearestBelow(to: 1000) // 17000
value = 17442
print(value.nearestUpDozens) // 17450
print(value.nearestUpHundreds) // 17500)
print(value.nearestUpThousands) // 18000
print(value.nearestUp(to: 1000) // 18000

Formatted value with the locale currency:

print(10.formattedPrice) // "$10.00"

MutableCollection extension

Sorts the mutable collection in place using

KeyPath

var articles = [Article(title: "B"), Article(title: "C"), Article(title: "A")]
articles.sort(by: \.title) // [A, B, C]
articles.sort(by: \.title, order: >) // [C, B, A]

NotificationCenter extension

Post a notification from a specific queue:

NotificationCenter.default.postNotification("aNotification", queue: DispatchQueue.main) 
NotificationCenter.default.postNotification("aNotification", object: aObject queue: DispatchQueue.main)
NotificationCenter.default.postNotification("aNotification", object: aObject userInfo: userInfo queue: DispatchQueue.main)

NSAttributedString extension

Check if an attribute is applied on the desired substring:

let text = "Hello"
let attrString = NSMutableAttributedString(text: "Hello world")
attrString = attrString.underlined(occurences: text)
attrString.isAttributeActivated(.underlineStyle, appliedOn: text, value: 1) // true

NSLayoutConstraint extension

No available for watchOS

Apply a multiplier to a constraint (currently working only for width and height):

let view = UIView(CGRect(x: 0, y: 0, width: 100, height: 200))
let constraint = NSLayoutConstraint(item: view, attribute: .width, ...)
constraint.apply(multiplier: 0.5, toView: superview)
print(constraint.constants) // 50

let constraint = NSLayoutConstraint(item: view, attribute: .height, ...)
constraint.apply(multiplier0.5, toView: superview)
print(constraint.constants) // 100

NSMutableAttributedString extension

Colorize each occurence:

let attrStr: NSMutableAttributedString = NSMutableAttributedString.colored(inText: "hello world", color: .yellow, occurences: "llo")

// OR
let attrStr: NSMutableAttributedString = NSMutableAttributedString(string: "Hello world")
attrStr.color(.yellow, occurences: "llo")

Colorize everything after an occurence:

let attrStr = NSMutableAttributedString.colored(inText: "Hello world", color: .yellow, afterOcurrence: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.color(.yellow, afterOcurrence: "llo")

Strike each occurence:

let attrStr: NSMutableAttributedString = NSMutableAttributedString.struck(inText: "Hello world", occurences: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.strike(occurences: "llo")

Strike everything after an occurence:

let attrStr: NSMutableAttributedString = NSMutableAttributedString.struck(inText: "Hello world", afterOcurrence: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.strike(ocurrences: "llo")

Underline each occurence:

let attrStr: NSMutableAttributedString = NSMutableAttributedString.underlined(inText: "Hello world", occurences: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.underline(occurences: "llo")

Underline everything after an occurence:

let attrStr: NSMutableAttributedString = NSMutableAttributedString.underlined(inText: "Hello world", afterOcurrence: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.underline(afterOcurrence: "llo")

Use custom font for each occurence:

let font = UIFont.boldSystemFont(ofSize: 15)
let attrStr: NSMutableAttributedString = NSMutableAttributedString.font(inText: "hello world", font: font, occurences: "llo")

// OR
let attrStr: NSMutableAttributedString = NSMutableAttributedString(string: "Hello world")
attrStr.font(font, occurences: "llo")

Custom font for everything after an occurence:

let font = UIFont.boldSystemFont(ofSize: 15)
let attrStr = NSMutableAttributedString.colored(inText: "Hello world", font: font, afterOcurrence: "llo")

// OR
let attrStr = NSMutableAttributedString(string: "Hello world")
attrStr.font(font, afterOcurrence: "llo")

NSObject extension

Get the class name of a

NSObject

#if !os(macOS)
    let vc = NSViewController()
    print(vc.className) // NSViewController
#else
    let vc = UIViewController()
    print(vc.className) // UIViewController
    print(UIViewController.className) // UIViewController
#endif

NSRange extension

Range after an occurence:

let string = "Hello world"
let range = NSRange(text: string, afterOccurence: "llo")
print(range) // location: 3, length: 8

Range of string:

let string = "Hello world"
let stringToFind = "ello wo"
let range = NSRange(textToFind: stringToFind, in: string)
print(range) // location: 1, length: 7

ReusableFormatters

Reuse your formatter to avoid heavy allocation:

SUDateFormatter.shared
SUNumberFormatter.shared
SUByteCountFormatter.shared
SUDateComponentsFormatter.shared
SUDateIntervalFormatter.shared
SUEnergyFormatter.shared
SUMassFormatter.shared

Sequence extension

Sort a sequence using

keyPath

let articles = [Article(title: "B"), Article(title: "C"), Article(title: "A")]
var sortedArticles = articles.sorted(by: \.title) // [A, B, C]
sortedArticles = articles.sorted(by: \.title, order: >) // [C, B, A]

String extension

Access with subscript:

var string = "hello world"
print(string[0]) // h
print(string[2]) // l
print(string[1...3]) // ell

Check if it contains a string:

let string = "Hello world"
print (string.contains(text: "hello")) // true
print (string.contains(text: "hellooooo")) // false

Check if it's a number:

var string = "4242"
print(string.isNumber) // true

var string = "test"
print(string.isNumber) // false

Check if it's a valid email:

var string = "[email protected]"
print(string.isEmail) // true
var string = "[email protected]"
print(string.isEmail) // false

Check if it's a valid IP address:

let ip4 = "1.2.3.4"
let ip6 = "fc00::"
let notIPAtAll = "i'll bribe you to say i'm an ip address!"

ip4.isIP4Address //true
ip4.isIP6Address //false
ip4.isIPAddress //true
ip6.isIP4Address //false
ip6.isIP6Address //true
ip6.isIPAddress //true
notIPAtAll.isIP4Address //false
notIPAtAll.isIP6Address //false
notIPAtAll.isIPAddress //false

Uncamelize a string:

var camelString = "isCamelled"
print(camelString.uncamelize) // is_camelled

Capitalize the first letter:

var string = "hello world"
string = string.capitalizedFirst
print(string)// Hello world

Trimmed spaces and new lines:

var string = " I'  am a    test  \n  "
print(string.trimmed()) // I'am a test

Truncated to have a limit of characters:

var string = "0123456789aaaa"
print(string.truncate(limit: 10)) // 0123456789...

Split string in chunks of n elements:

let string = "abcd"
print(string.split(intoChunksOf: 2)) // ["ab", "cd"]

Timer extension

Schedule timer every seconds:

var count = 0
Timer.every(1.second, fireImmediately: true) { timer in // fireImmediately is an optional parameter, defaults to false
    print("Will print every second")
    if count == 3 {
        timer.invalidate()
    }
    count++
}

Schedule timer after a certain delay:

Timer.after(2.seconds) { _ in
    print("Prints this 2 seconds later in main queue")
}

Manual scheduling a timer:

let timer = Timer.new(every: 2.seconds) { _ in
    print("Prints this 2 seconds later in main queue")
}
timer.start(onRunLoop: RunLoop.current, modes: RunLoopMode.defaultRunLoopMode)

Manual scheduling a timer with a delay:

let timer = Timer.new(after: 2.seconds) { _ in
    print("Prints this 2 seconds later in main queue")
}
timer.start(onRunLoop: RunLoop.current, modes: RunLoopMode.defaultRunLoopMode)

URL extension

Get query parameters from URL:

let url = URL(string: "http://example.com/api?v=1.1&q=google")
let queryParameters = url?.queryParameters
print(queryParameters?["v"]) // 1.1
print(queryParameters?["q"]) // google
print(queryParameters?["other"]) // nil

Add skip backup attributes to you URL:

let url = URL(string: "/path/to/your/file")        
url?.addSkipBackupAttribute() // File at url won't be backupped!

UserDefaults extension

Get and set values from

UserDefaults

let Defaults = UserDefaults.standard
Defaults["userName"] = "test"
print(Defaults["userName"]) // test

Check if the

UserDefaults

UserDefaults.has(key: "aKey")
// OR
UserDefaults.standard.has(key: "aKey")

Remove all values in

UserDefaults

UserDefaults.standard.removeAll()

SwiftUI

UIElementPreview

Generate automatically multiple previews including:

• Default sized preview or dedicated preview device
• A preview with Dark Mode enabled
• Each localization of our project applied to a preview
• Different dynamic type sizes applied

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        UIElementPreview(ContentView(),
                         previewLayout: .sizeThatFits, // default is `.device`
                         previewDevices: ["iPhone SE"], // default is iPhone SE and iPhone XS Max. Note: it won't be used if `previewLayout` is `.sizeThatFits`
                         dynamicTypeSizes:[.extraSmall] // default is: .extraSmall, .large, .extraExtraExtraLarge
                        )
    }
}

SwiftUI Extensions

Binding extension

Pass an interactive value that’ll act as a preview stand-in for a binding:

struct MyButton: View {
    @Binding var isSelected: Bool
    // ...
}

struct MyButton_Previews: PreviewProvider {
    static var previews: some View {
        MyButton(isSelected: .mock(true))
    }
}

UIKit Extensions

UIAlertController extension

Create a custom

UIAlertController

let alertController1 = UIAlertController(title: "Title",
                                        message: "Message")

let alertController2 = UIAlertController(title: "Title",
                                        message: "Message",
                                        defaultActionButtonTitle: "Cancel")
let alertController3 = UIAlertController(title: "Title",
                                        message: "Message",
                                        defaultActionButtonTitle: "Cancel",
                                        defaultActionButtonStyle: .cancel) 
let alertController1 = UIAlertController(title: "Title",
                                        message: "Message",
                                        defaultActionButtonTitle: "Cancel",
                                        defaultActionButtonStyle: .cancel,
                                        tintColor: .blue)

Show an

UIAlertController

alertController.show()
alertController.show(animated: false)
alertController.show(animated: true, completion: {
    print("Presented")
})

Add an action to the

UIAlertController

alertController.addAction(title: "ActionTitle")

alertController.addAction(title: "ActionTitle",
                          style: .destructive)
alertController.addAction(title: "ActionTitle",
                          style: .destructive,
                          isEnabled: false)
alertController.addAction(title: "ActionTitle",
                          style: .destructive,
                          isEnabled: false,
                          handler: nil)

UIApplication extension

Get the current view controller display:

UIApplication.shared.topViewController() // Using UIWindow's rootViewController as baseVC
UIApplication.shared.topViewController(from: baseVC) // topVC from the base view controller

Get the app delegate:

UIApplication.delegate(AppDelegate.self)

Open app settings:

UIApplication.shared.openAppSettings()

Open app review page:

let url = URL(string: "https://itunes.apple.com/app/{APP_ID}?action=write-review")
UIApplication.shared.openAppStoreReviewPage(url)

UIButton extension

Add right image with custom offset to button:

let button = UIButton(frame: .zero)
button.addRightImage(image, offset: 16)

UICollectionView extension

Register and dequeue safely your

UICollectionViewCell

// 1. Make your `UICollectionCell` conforms to `Reusable` (class-based) or `NibReusable` (nib-based)
final class ReusableClassCollectionViewCell: UICollectionViewCell, Reusable {}
// 2. Register your cell:
collectionView.register(cellType: ReusableClassCollectionViewCell.self)
// 3. Dequeue your cell:
let cell: ReusableClassCollectionViewCell = collectionView.dequeueReusableCell(at: indexPath)

Register and dequeue safely your

UICollectionReusableView

// 1. Make your `UICollectionReusableView` conforms to `Reusable` (class-based) or `NibReusable` (nib-based)
final class ReusableNibCollectionReusableView: UICollectionReusableView, NibReusable
// 2. Register your cell:
collectionView.register(supplementaryViewType: ReusableNibCollectionReusableView.self, ofKind: UICollectionView.elementKindSectionHeader)
// 3. Dequeue your cell:
let header: ReusableNibCollectionReusableView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, at: indexPath)

UICollectionViewCell extension

Apply a corner radius to the cell:

let cell = UICollectionViewCell()
cell.applyCornerRadius(10)

Animate when cell is highlighted:

class MyCollectionViewCell: UICollectionViewCell {
    // ...
    override var isHighlighted: Bool {
        willSet {
            self.animate(scale: newValue, options: .curveEaseInOut) // Note that the animation is customisable, but all parameters as default value
        }
    }
    // ...
}

UIFont extension

Obtains a font that scale to support Dynamic Type:

let font = UIFont.dynamicStyle(.body, traits: .traitsBold)

UIDevice extension

Access to your device information:

print(UIDevice.idForVendor) // 104C9F7F-7403-4B3E-B6A2-C222C82074FF
print(UIDevice.systemName()) // iPhone OS
print(UIDevice.systemVersion()) // 9.0
print(UIDevice.deviceName) // iPhone Simulator / iPhone 6 Wifi
print(UIDevice.deviceLanguage) // en
print(UIDevice.isPhone) // true or false
print(UIDevice.isPad) // true or false

Check your system version:

print(UIDevice.isVersion(8.1)) // false
print(UIDevice.isVersionOrLater(8.1)) // true
print(UIDevice.isVersionOrEarlier(8.1)) // false

Force device orientation:

UIDevice.forceRotation(.portrait)
UIDevice.current.forceRotation(.portrait)

UIImage extension

Create an image from a color:

let image = UIImage(color: .green)

Fill an image with a color:

let image = UIImage(named: "image")
let greenImage = image.filled(with: .green)

Combined an image with another:

let image = UIImage(named: "image")
let image2 = UIImage(named: "image2")
let combinedImage = image.combined(with: image2)

Change the rendering mode:

var image = UIImage(named: "image")
image = image.template // imageWithRenderingMode(.alwaysTemplate)
image = image.original // imageWithRenderingMode(.alwaysOriginal)

UILabel extension

Configure a dynamic text style to the label:

label.configureDynamicStyle(.body, traits: .traitBold)

Detect if a label text is truncated:

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 30, height: 40))
label.text = "I will be truncated :("
print(label.isTruncated()) // true

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 30, height: 40))
label.text = ":)"
print(label.isTruncated()) // false

Customize label line height:

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 30, height: 40))
label.setText("A long multiline text")
label.setLineHeight(0.9)

Customize the label truncated text (replace the default

...

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 30, height: 40))
label.setText("I will be truncated :(", truncatedText: ".")
print(label.text) // I wi.

UIScreen extension

Get the screen orientation:

if UIInterfaceOrientationIsPortrait(UIScreen.currentOrientation) {
    // Portrait
} else {
    // Landscape
}

Get the screen size:

print(UIScreen.size) // CGSize(375.0, 667.0) on iPhone6
print(UIScreen.width) // 375.0 on iPhone6
print(UIScreen.height) // 667.0 on iPhone6
print(UIScreen.heightWithoutStatusBar) // 647.0 on iPhone6

Get the status bar height:

print(UIScreen.statusBarHeight) // 20.0 on iPhone6

UISlider extension

Get the value where the user tapped using an

UITapGestureRecognizer

let slider = UISlider(frame: .zero)
slider.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(sliderTapped(_:))))

func sliderTapped(sender: UITapGestureRecognizer) {
    let value = slider.value(for: sender)
}

UIStoryboard extension

Get the application's main storyboard:

let storyboard = UIStoryboard.main

UISwitch extension

Toggle

UISwitch

let aSwitch = UISwitch(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
aSwitch.toggle()
print(aSwitch.isOn) // true

aSwitch.toggle(animated: false)

UITableView

Register and dequeue safely your

UITableViewCell

// 1. Make your `UITableViewCell` conforms to `Reusable` (class-based) or `NibReusable` (nib-based)
final class ReusableClassTableViewCell: UITableViewCell, Reusable {}
// 2. Register your cell:
tableView.register(cellType: ReusableClassTableViewCell.self)
// 3. Dequeue your cell:
let cell: ReusableClassTableViewCell = tableView.dequeueReusableCell(at: indexPath)

Register and dequeue safely your

UITableViewHeaderFooterView

// 1. Make your `UITableViewHeaderFooterView` conforms to `Reusable` (class-based) or `NibReusable` (nib-based)
final class ReusableClassHeaderFooterView: UITableViewHeaderFooterView, Reusable {}
// 2. Register your header or footer:
tableView.register(headerFooterViewType: ReusableClassHeaderFooterView.self)
// 3. Dequeue your header or footer:
let cell: ReusableClassHeaderFooterView = tableView.dequeueReusableHeaderFooterView()

UITextField extension

Configure a dynamic text style to the textfield:

textField.configureDynamicStyle(.body, traits: .traitBold)

Modify clear button image:

let clearButtonImage = UIImage(named: "clear_button")
let textField = UITextField()
textField.setClearButton(with: clearButtonImage)

Modify placeholder's color:

let textField = UITextField()
// set `placeholder` or `attributedPlaceholder`
textField.setPlaceHolderTextColor(.blue)

UITextView extension

Configure a dynamic text style to the textfield:

textView.configureDynamicStyle(.body, traits: .traitBold)

UIView extension

Change the frame of the view easily:

let aView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
aView.x += 100 // move  to right
aView.y += 100 // move downwards
aView.width -= 10 // make the view narrower
aView.height -= 10 // make the view shorter 

Apply a corner radius to the view:

let view = UIView()
view.applyCornerRadius(10)
view.applyCornerRadius(20, maskedCorners: [.layerMaxXMaxYCorner])

Find the

ViewController

let parent: UIViewController? = aView.parentViewController

Find a subview using its `accessibilityIdentifier, useful to tests private outlets:

aView.findView(forIdentifier: "accessibilityIdentifier")

Find the first subview corresponding to a specific type:

let scrollView: UIScrollView? = aView.findView()

Add a SwiftUI

View

aView.addSubSwiftUIView(SwiftUIView())

Automates your localizables:

aView.translateSubviews()

It will iterate on all the subviews of the view, and use the text / placeholder as key in

NSLocalizedString

Add constraints between a view and its superview:

aView.addConstraints() // Add constraints to all edges with zero insets
aView.addConstraints(to: [.top, .bottom]) // Add constraints to top and bottom edges with zero insets
aView.addConstraints(to: [.top, .left], insets: UIEdgeInsets(top: 10, left: 20, bottom: 0, right: 0)) // Add constraints to top and left edges with custom insets

UIViewController extension

Generate a Xcode preview for any view controllers:

@available(iOS 13, *)
struct MyViewPreview: PreviewProvider {
    static var previews: some View {
        MyViewController().preview
    }
}

Reset the navigation stack by deleting previous view controllers:

let navController = UINavigationController()
navController.pushViewController(vc1, animated: true)
navController.pushViewController(vc2, animated: true)
navController.pushViewController(vc3, animated: true)
vc3.removePreviousControllers(animated: true)
print(navController.viewControllers) // [vc3]

Check if ViewController is onscreen and not hidden:

let viewController = UIViewController()
print(viewController.isVisible) // false

Check if ViewController is presented modally:

let viewController = UIViewController()
print(viewController.isModal)

Open Safari modally:

let url = URL(string: "https://www.apple.com")
vc.openSafariVC(url: url, delegate: self)

Add a child view controller to another controller:

vc.addChildController(childVC, subview: vc.view, animated: true, duration: 0.35, options: [.curveEaseInOut, .transitionCrossDissolve])

Add a child view controller to a container view:

vc.addChildController(childVC, in: containerView)

Remove a child view controller:

vc.removeChildController(childVC)

Add a SwiftUI

View

UIView

vc.addSubSwiftUIView(SwiftUIView(), to: vc.view)

UIKit Protocols:

NibLoadable

Make your

UIView

UIView

class NibLoadableView: UIView, NibLoadable {
    // ...
}

let view = NibLoadableView.loadFromNib()

NibOwnerLoadable

Make your

UIView

UIView

class NibLoadableView: UIView, NibOwnerLoadable {
    // ...

required init?(coder aDecoder: NSCoder) {
  super.init(coder: aDecoder)
  self.loadNibContent()
}
}
// Then use it directly from another xib or whatever...

AppKit, Cocoa Extensions

NSView extension

Change the frame of the view easily

let aView = NSView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
aView.x += 100 // move  to right
aView.y += 100 // move downwards
aView.width -= 10 // make the view narrower
aView.height -= 10 // make the view shorter 

Automates your localizables

aView.convertLocalizables()

It will iterate on all the subviews of the view, and use the text / placeholder as key in

NSLocalizedString

Protocols

Injectable

Protocol to do

ViewController

class RedPillViewController: UIViewController, Injectable {

@IBOutlet weak private var mainLabel: UILabel!

// the type matches the IOU's type
typealias T = String

// this is my original dependency (IOU)
// I can now make this private!
private var mainText: String!

override func viewDidLoad() {
    super.viewDidLoad()

    // this will crash if the IOU is not set
    assertDependencies()

    // using the IOU if needed here,
    // but using it later is fine as well
    mainLabel.text = mainText
}

// Injectable Implementation
func inject(text: T) {
    mainText = text
}

func assertDependencies() {
    assert(mainText != nil)
}
}
// ViewController that will inject data...
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
switch segueIdentifierForSegue(segue) {
case .TheRedPillExperience
    let redPillVC = segue.destinationViewController as? RedPillViewController
    redPillVC?.inject("😈")
case .TheBluePillExperience:
    let bluePillVC = segue.destinationViewController as? BluePillViewController
    bluePillVC?.inject("👼")
}
}

Occupiable

The following use cases works for String Array, Dictionary, and Set

isEmpty

isNotEmpty

No optional types only

var string = "Hello world"
print(string.isNotEmpty) // true
print(string.isEmpty) // false

isNilOrEmpty

Optional types only

let string: String? = ""
print(string.isNilOrEmpty) // true

Then

Syntactic sugar for Swift initializers:

let label = UILabel().then {
    $0.textAlignment = .Center
    $0.textColor = .blackColor()
    $0.text = "Hello, World!"
}

PropertyWrappers

UserDefaultsBacked

Type safe access to UserDefaults with support for default values.

struct SettingsViewModel {
    @UserDefaultsBacked(key: "search-page-size", defaultValue: 20)
    var numberOfSearchResultsPerPage: Int

@UserDefaultsBacked(key: "signature")
var messageSignature: String?
}

Others

UnitTesting

Grand Central Dispatch sugar syntax:

Detect if UITests are running:

if UnitTesting.isRunning {
  // tests are running
} else {
  // everything is fine, move along
}

Measure tests performance:

func testPerformance() {
  let measurement = measure {
    // run operation
  }
}

UITesting

Detect if UITests are running:

if UITesting.isRunning {
  // tests are running
} else {
  // everything is fine, move along
}

Shell Utility

(macOS only)

Runs a command on a system shell and provides the return code for success, STDOUT, and STDERR.

STDOUT as one continuous String:

let (rCode, stdOut, stdErr) = SystemUtility.shell(["ls", "-l", "/"])
// rCode = 0 (which is "true" in shell)
// stdOut = "total 13\ndrwxrwxr-x+ 91 root  admin  2912 Feb 11 01:24 Applications" ...  etc
// stdErr = [""]

STDOUT as array of Strings separated by newlines:

let (rCode, stdOut, stdErr) = SystemUtility.shellArrayOut(["ls", "-l", "/"])
// rCode = 0 (which is "true" in shell)
// stdOut = ["total 13", "drwxrwxr-x+ 91 root  admin  2912 Feb 11 01:24 Applications" ...  etc]
// stdErr = [""]

Installation

• Xcode 8 and later
• Swift 3.0
• iOS 8.0 or later
• macOS 10.10 or later
• tvOS 9.0 or later
• watchOS 2.0 or later

Manually

Copy the SwiftyUtils folder into your Xcode project. (Make sure you add the files to your target(s))

CocoaPods

Add

pod SwiftyUtils

Carthage

Add

github "tbaranes/SwiftyUtils"

Swift Package Manager

You can use The Swift Package Manager to install

SwiftyUtils

Package.swift

import PackageDescription

let package = Package(
    dependencies: [
        .Package(url: "https://github.com/tbaranes/SwiftyUtils.git", majorVersion: 0)
    ]
)

Feedback

• If you found a bug, open an issue
• If you have a feature request, open an issue
• If you want to contribute, submit a pull request

Contact

• @tbaranes on github

License

SwiftyUtils is under the MIT license. See the LICENSE file for more information. dic.testAll