hcn1519

class Solution:
    # sliding window(O(n))
    def numberOfArithmeticSlices(self, nums: List[int]) -> int:
        def numberOfArithmeticArr(n: int) -> int:
            if n < 3:
                return 0
            return ((n - 2) * (n - 1)) // 2
        
        if len(nums) < 3:
            return 0

hcn1519

func allSubClass<T>(of targetClass: T, bundle: Bundle) -> [T] {
    var count: UInt32 = 0
    guard let allClasses = objc_copyClassList(&count) else {
        return []
    }

    let targetClasses: [T] = (0..<count).compactMap { index in
        let someClass: AnyClass = allClasses[Int(index)]

        guard Bundle(for: someClass) == bundle else { return nil }

hcn1519

func allSubClass<T>(of targetClass: T, bundle: Bundle) -> [T] {
    var count: UInt32 = 0
    guard let allClasses = objc_copyClassList(&count) else {
        return []
    }

    let targetClasses: [T] = (0..<count).compactMap { index in
        let someClass: AnyClass = allClasses[Int(index)]

        guard Bundle(for: someClass) == bundle else { return nil }

hcn1519

/ back 버튼 여백 적용 메소드
extension UIImage {
    func imageWithInsets(insets: UIEdgeInsets) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(
            CGSize(width: self.size.width + insets.left + insets.right,
                   height: self.size.height + insets.top + insets.bottom),
            false, self.scale)
        guard UIGraphicsGetCurrentContext() != nil else { return UIImage() }
        let origin = CGPoint(x: insets.left, y: insets.top)
        self.draw(at: origin)

hcn1519

Create GradientLayer on your tableViewCell(collectionViewCell)

1. Create CAGradientLayer Instance on your tableViewCell

class MyCell: UITableViewCell {
    let gradientLayer = CAGradientLayer()
}

hcn1519

class VC: ViewController {
    var keyboardVisible = true
    
    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: .UIKeyboardWillShow, object: nil)
    }
    deinit {
        NotificationCenter.default.removeObserver(self)

hcn1519

import Foundation

struct ReadInput {

    private var currentIndex: Int = 0
    private var inputArray: [String] = []

    // 데이터를 배열로 변환
    public mutating func readLineToArray() -> [String] {

hcn1519

// p1

import Foundation

func problem1(n: Int, arr1: [Int], arr2: [Int]) {

    let binaryArr1 = generateBinaryArray(arr: arr1, length: n)
    let binaryArr2 = generateBinaryArray(arr: arr2, length: n)

hcn1519

import UIKit

// Use Basic Encoder & Decoder By Codable
struct Book: Codable {
    var title: String
    var author: String
    var price: Int
}

let book1 = Book(title: "Hello World", author: "hcn1519", price: 10000)

hcn1519

import Foundation

let fileManager = FileManager()

let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!

let dataPath = documentsDirectory.appendingPathComponent("FileManager Directory")

do {
    try fileManager.createDirectory(atPath: dataPath.path, withIntermediateDirectories: false, attributes: nil)