gaeng2y

class User {
    var nickname: String
    var age: Int

    init(nickname: String, age: Int) {
        // init
        self.nickname = nickname
        self.age = age
    }

gaeng2y

protocol name {
  // body
}

gaeng2y

extension name {
// addition
}

gaeng2y

enum Student {
case Name(String) 
case Mark(Int,Int,Int)
}
var studDetails = Student.Name("Swift")
var studMarks = Student.Mark(98,97,95)
switch studMarks {
case .Name(let studName):
    print("Student name is: \(studName).") 
case .Mark(let Mark1, let Mark2, let Mark3):

gaeng2y

do {
    try 표현식 결과
} catch 패턴 1 { 
    처리 결과
} catch 패턴 2 where 조건 { 
    처리 결과
} catch { 
    처리 결과
}

gaeng2y

enum PhoneError: Error { case unknown case batteryLow(batteryLevel: Int) }
throw PhoneError.batteryLow(batteryLevel: 20)

- 던져진 오류를 처리하기 위한 작업이 필요하다
```swift
func checkPhoneBatteryStatus(batteryLevel: Int) throws -> String {
    guard batteryLevel != -1 else { throw PhoneError.unknown }
    guard batteryLevel > 20 else { throw PhoneError.batteryLow(batteryLevel: batteryLevel) }
    return "배터리 상태 정상"
}

gaeng2y

{ (param) -> return type in
// body
}

gaeng2y

if (@available(iOS 15.0, *)) {
	[[UITableView appearance] setSectionHeaderTopPadding:0.0f];
} else {
	// Fallback on earlier versions
}

gaeng2y

import UIKit

class CustomInputView: UIInputView {
    override init(frame: CGRect, inputViewStyle: UIInputView.Style) {
        super.init(frame: frame, inputViewStyle: inputViewStyle)
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

gaeng2y

import UIKit

class ViewController: UIViewController {
    lazy var textField: UITextField = UITextField()
    lazy var label: UILabel = UILabel()
    lazy var btn: UIButton = UIButton()
    lazy var safeArea = view.safeAreaLayoutGuide
    lazy var isCustomInputView = false

    override func viewDidLoad() {