DT Bunch of Extensions

This is my package with useful extensions to standard Swift classes and some tricky things. Here I collect things that I use in my projects and which for some reason are not in the standard implementation. Feel free to use it as well as add your own methods. I am a novice developer, so some things can be done not very cleverly, so I will be glad to receive any feedback, comments, fixes and improvements.

Extensions

Int

getNoun

public func getNoun(_ root: String, singleEnd: String, dualEnd: String, multipleEnd: String) -> String

This function returns a word from its root and end depending on the number to which it is applied. It is useful for the Russian language.

Example

let one = 1
let two = 2
let five = 5
let twelve = 12

let root = "коти"
let singleEnd = "к"
let dualEnd = "ка"
let multipleEnd = "ков"

print("\(one) \(one.getNoun(root, singleEnd: singleEnd, dualEnd: dualEnd, multipleEnd: multipleEnd) )")
print("\(two) \(two.getNoun(root, singleEnd: singleEnd, dualEnd: dualEnd, multipleEnd: multipleEnd) )")
print("\(five) \(five.getNoun(root, singleEnd: singleEnd, dualEnd: dualEnd, multipleEnd: multipleEnd) )")
print("\(twelve) \(twelve.getNoun(root, singleEnd: singleEnd, dualEnd: dualEnd, multipleEnd: multipleEnd) )")

// 1 котик
// 2 котика
// 5 котиков
// 12 котиков

String

calculateTextFieldHeight

public func calculateTextFieldHeight(width: CGFloat, font: UIFont) -> CGFloat

This function returns the text size in height with the specified width and font. It can be used to set the size of UITextView when the text size is not known.

Example

let text = """
Far far away, behind the word mountains, far from the countries Vokalia and Consonantia, there live the blind texts. Separated they live in Bookmarksgrove right at the coast of the Semantics, a large language ocean.
"""

let font = UIFont.systemFont(ofSize: 17, weight: .medium)
let height = text.calculateTextFieldHeight(width: 250, font: font)
//result: 163

TimeInterval

timeString

public var timeString: String

Computed value that returns a string in HH:MM:SS format. Useful for displaying time in timers. Note: HH will be without first 0 when hours less than 10

Example

let interval: TimeInterval = 7891
print(interval.timeString)
//2:11:31

Date

yesterday

static public var yesterday: Date

Computed value that returns the Date object of the previous day of system date where time is noon.

Example

let date = Date()
print(date)
// 2020-08-19 14:33:16 +0000
let yesterday = Date.yesterday
print(yesterday)
// 2020-08-18 09:00:00 +0000

tomorrow

static public var tomorrow: Date

Computed value that returns the Date object of the next day of system date where time is noon.

Example

let date = Date()
print(date)
// 2020-08-19 14:33:16 +0000
let tomorrow = Date.tomorrow
print(tomorrow)
// 2020-08-20 09:00:00 +0000

dayBefore

public var dayBefore: Date

Computed value that returns the Date object of the previous day to applied Date where time is noon.

Example

var dateComponents = DateComponents()
dateComponents.year = 2020
dateComponents.month = 01
dateComponents.day = 10
dateComponents.timeZone = Calendar.current.timeZone
dateComponents.hour = 12
dateComponents.minute = 28

if let date = Calendar.current.date(from: dateComponents) {
    print(date)
    print(date.dayBefore)
}
// 2020-01-10 09:28:00 +0000
// 2020-01-09 09:00:00 +0000

dayAfter

public var dayAfter: Date

Computed value that returns the Date object of the next day to applied Date where time is noon.

Example

var dateComponents = DateComponents()
dateComponents.year = 2020
dateComponents.month = 01
dateComponents.day = 10
dateComponents.timeZone = Calendar.current.timeZone
dateComponents.hour = 12
dateComponents.minute = 28

if let date = Calendar.current.date(from: dateComponents) {
    print(date)
    print(date.dayAfter)
}
// 2020-01-10 09:28:00 +0000
// 2020-01-11 09:00:00 +0000

noon

public var noon: Date

Computed value that returns the Date object of applied Date where time is noon.

Example

var dateComponents = DateComponents()
dateComponents.year = 2020
dateComponents.month = 01
dateComponents.day = 10
dateComponents.timeZone = Calendar.current.timeZone
dateComponents.hour = 12
dateComponents.minute = 28

if let date = Calendar.current.date(from: dateComponents) {
    print(date)
    print(date.noon)
}
// 2020-01-10 09:28:00 +0000
// 2020-01-10 09:00:00 +0000

isLastDayOfMonth

public var isLastDayOfMonth: Bool

Computed value that returns true when applied Date is last day of month, false otherwise.

Example

var dateComponents = DateComponents()
dateComponents.year = 2020
dateComponents.month = 01
dateComponents.day = 31
dateComponents.timeZone = Calendar.current.timeZone
dateComponents.hour = 12
dateComponents.minute = 28

if let date = Calendar.current.date(from: dateComponents) {
    print(date)
    print(date.isLastDayOfMonth)
}
// 2020-01-31 09:28:00 +0000
// true

CGPoint

init(center: CGPoint, radius: CGFloat, angle: CGFloat)

public init(center: CGPoint, radius: CGFloat, angle: CGFloat)

Initializer that accepts input parameters center, radius and angle. Useful for work with circles and circular UI elements.

Example

import UIKit

let center = CGPoint(x: 100, y: 100)
let radius: CGFloat = 50
let angle = CGFloat.pi

let pointOnCircle = CGPoint(center: center, radius: radius, angle: angle)
print(pointOnCircle)
// (50.0, 100.0)

UIColor

rgba

public var rgba: (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)

Computed value that returns the tuple of color values in the RGB system.

Example

print(UIColor.systemPink.rgba)
// (red: 1.0, green: 0.17647058823529413, blue: 0.3333333333333333, alpha: 1.0)

getGradientColor

open func getGradientColor(at percent: CGFloat, with color: UIColor) -> UIColor

Function that returns UIColor for a linear gradient between two colors at specific points from 0 to 1.

Example

let black = UIColor.black
let red = UIColor.red
let halfGrColor = black.getGradientColor(at: 0.5, with: red)
print(halfGrColor.rgba)
// (red: 0.5, green: 0.0, blue: 0.0, alpha: 1.0)

TODO: Describe all methods TODO: Tests