자주 사용할 코드

자주 사용하는 코드

• (String).NilOrEmpty()

  public extension String {
      func trim() -> String {
          return self.trimmingCharacters(in: CharacterSet.whitespaces)
      }
      func NilOrEmpty()->Bool{
          if(self.trim().isEmpty){return true}
          else{return false}
      }
  }       

• 숫자만 가능한 TextField

  func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
          if(textField == ageTextField){
              let allowedCharacters = CharacterSet.decimalDigits
              let characterSet = CharacterSet(charactersIn: string)
              return allowedCharacters.isSuperset(of: characterSet)
          }
          return true
  }

• Storyboard Navigate to next ViewController

  let storyBoard = UIStoryboard(name: "Main", bundle: nil)
          
  guard let nextViewController = storyBoard.instantiateViewController(withIdentifier: NextViewController.reuseIdentifier) as? NextViewController else{return}
          
  present(thirdViewController, animated: true, completion: nil)

• ReuseIdentifier

  extension NSObject{
      static var reuseIdentifier: String{
          return String(describing: self)
      }
  }

• UnwindSegue

  //돌아가야할 ViewController에 기입
  @IBAction func unwindViewController(segue:UIStoryboardSegue){}
  //Action을 수행하는 ViewController
  self.performSegue(withIdentifier: "unwindIdentifier", sender: nil)

• Random

  let Max:UInt32 = 9
  let Min:UInt32 = 1
  let random = Int(arc4random_uniform(Max) + Min)

  ​