ikju

let vc = marketViewController()
 /*
- pushViewController 으로 넘어갈 viewController의 상단에 '뒤로'단어를 다른 단어로 바꾸고 싶다면 (A - > B) A 페이지에서 밑의 코드를 적용시킨다.
 */
let backItem = UIBarButtonItem()
backItem.title = ""
navigationItem.backBarButtonItem = backItem
        
self.navigationController?.pushViewController(vc, animated: true)

ikju

self.navigationController?.navigationBar.tintColor = .black(원하는색)

ikju

textLabel.layer.cornerRadius = 5 // 테두리에 라운드 넣기 <- 없으면 직사각형이나옴
        textLabel.layer.borderWidth = 1 //테두리의 선 두께
        textLabel.layer.borderColor = UIColor.black.cgColor //테두리 선 색깔

ikju

 var lastKnowContentOfsset : CGFloat?
 // 현재 스크롤 위치와 lastKnowContentOfsset 와 비교해서 위인지 아래인지 확잉ㄴ
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if scrollView == main_collection_view {
            let contentOffset = scrollView.contentOffset.y
            print("contentOffset: ", contentOffset)
            if let lastKnowContentOfsset = lastKnowContentOfsset {
                if contentOffset > lastKnowContentOfsset {
                    
                    print("scrolling Down")

ikju

let imageView = UIImageView() 
imageView.contentMode = .scaleAspectFill
imageView.image = UIImage(named: "example")?.withAlignmentRectInsets(UIEdgeInsets(top: -4, left: 0, bottom: -4, right: 0))

ikju

switch.tintColor = .grey // the "off" color
switch.onTintColor = .black // //스위치가 온일때 뒷 배경색깔 '기본색 : 초록색)

ikju

override func viewDidLoad() {
   super.viewDidLoad()        
   NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(sender:)), name: UIResponder.keyboardWillShowNotification, object: nil)
   NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(sender:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardWillShow(sender: NSNotification) {
     self.view.frame.origin.y = -150 // Move view 150 points upward 
}

ikju

override func viewDidLoad() {
  super.viewDidLoad()
    self.tabBarController?.tabBar.isHidden = true
    self.tabBarController?.tabBar.isTranslucent = true // <- 이코드가 꼭 있어야함
  }

//다른 뷰에서 tabBar를 다시 보이게 하고 싶으면(viewWillAppear)에 false를 해주자
override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.tabBarController?.tabBar.isHidden = false

ikju

extension UITextField {

   func setPadding(left: CGFloat? = nil, right: CGFloat? = nil){
       if let left = left {
          let paddingView = UIView(frame: CGRect(x: 0, y: 0, width: left, height: self.frame.size.height))
          self.leftView = paddingView
          self.leftViewMode = .always
       }

       if let right = right {

ikju

func textFieldDoneBtnMake(text_field : UITextField)
    {
        let ViewForDoneButtonOnKeyboard = UIToolbar()
        ViewForDoneButtonOnKeyboard.sizeToFit()
        let btnDoneOnKeyboard = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(self.doneBtnFromKeyboardClicked))
        ViewForDoneButtonOnKeyboard.items = [btnDoneOnKeyboard]
        text_field.inputAccessoryView = ViewForDoneButtonOnKeyboard
    }
    
    @objc func doneBtnFromKeyboardClicked (sender: Any)