tgnivekucn

// Ref 1: https://www.jianshu.com/p/b7fbe502d909
// Ref 2: https://crccalc.com/
// CRC 16 MODBUS
extension String {
    func asHexUInt16Array() -> [UInt16] {
        var startIndex = self.startIndex
        return stride(from: 0, to: count, by: 2).compactMap { _ in
            let endIndex = index(startIndex, offsetBy: 2, limitedBy: self.endIndex) ?? self.endIndex
            defer { startIndex = endIndex }
            return UInt16(self[startIndex..<endIndex], radix: 16)

tgnivekucn

import Foundation

// Ref: https://stackoverflow.com/questions/24058906/printing-a-variable-memory-address-in-swift
// Author: nyg (profile: https://stackoverflow.com/users/5536516/nyg)
struct MemoryAddress<T>: CustomStringConvertible {
    
    let intValue: Int
    

tgnivekucn

// Ref: https://stackoverflow.com/questions/24058906/printing-a-variable-memory-address-in-swift
// Author nyg (profile: https://stackoverflow.com/users/5536516/nyg)
struct MemoryAddress<T>: CustomStringConvertible {
    
    let intValue: Int
    
    var description: String {
        let length = 2 + 2 * MemoryLayout<UnsafeRawPointer>.size
        return String(format: "%0\(length)p", intValue)

tgnivekucn

      
        let date2 = toGmtDateTest(year: 2022, month: 8, date: 30, hour: 11, minute: 19, second: 00, secondsFromGMT: 28800)
        print(date2?.timeIntervalSince1970)
        print(date2)

        let date3 = toGmtDateTest2(year: 2022, month: 8, date: 30, hour: 11, minute: 19, second: 00)
        print(date3?.timeIntervalSince1970)
        print(date3)
    

tgnivekucn

func validatePhoneNumber(phoneNumber: String) -> Bool {
    if let regex = try? NSRegularExpression(pattern: "09\\d{2}-\\d{3}-\\d{3}") {
        let range = NSRange(location: 0, length: phoneNumber.utf16.count)
        let result = regex.firstMatch(in: phoneNumber, range: range)
        if result != nil {
            return true
        }
    }
    return false
}

tgnivekucn

Color identifier naming rule:
Regular expression:
(color)\.((common)|([A-Za-z])+(Page)){1}(\.([A-Za-z])+)*(\.([A-Za-z])+(Color)s?)$

Example:
1. Color category
2. UI page name or plist file name
3. Subview name(ex: customCell) (p.s. this field might be zero)
4. Unique color name (p.s. or unique color array name)
    

tgnivekucn

// Product and Concrete Product
protocol Adventurer {
    func getType() -> String
}

class Archer: Adventurer {
    func getType() -> String {
        print("I'm an archer")
        return String(describing: Archer.self)
    }

tgnivekucn

// Product and Concrete Product
protocol Adventurer {
    func getType() -> String
}

class Archer: Adventurer {
    func getType() -> String {
        print("I'm an archer")
        return String(describing: Archer.self)
    }

tgnivekucn

// lazy Singleton: create the singleton object when needed
// Note: Global constants and variables are always computed lazily
// ref: https://docs.swift.org/swift-book/LanguageGuide/Properties.html#ID263
class SingletonGreed {
    static let shared = SingletonGreed()
    private init() {}
}

class SingletonThreadSafe {
    private static var shared: SingletonThreadSafe?

tgnivekucn

import UIKit
import Combine

class ViewModel {
    var updateLabel: ((String?) -> Void)?
    var textString: String? {
        didSet {
            updateLabel?(textString)
        }
    }