[SWIFT]NotificationCenter 사용

NotificationCenter 키보드 보이기,숨기기 / 백그라운드,포그라운드 / 사용자 Notification 

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// NotificationCenter 키보드 Noti 등록

// 키보드 보이기
NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillShow(noti: )) , name: UIResponder.keyboardWillShowNotification, object: nil)
// 키보드 숨기기
NotificationCenter.default.addObserver( self, selector: #selector(keyboardWillHide(noti: )) , name: UIResponder.keyboardWillHideNotification, object: nil)
        
// NotificationCenter 삭제
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification , object: nil)
NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification , object: nil)
        
@objc func keyboardWillShow(noti: NSNotification) {
		//키보드의 높이를 가져오는 코드
        let notiInfo = noti.userInfo! as NSDictionary
        let keyboardFrame = notiInfo[UIResponder.keyboardFrameEndUserInfoKey] as! CGRect
        let height = keyboardFrame.size.height
        self.bottomConstraint.constant = height
        
        //애니메이션 추가 (View가 먼저 올라가서 키보드 올라오는 공백이 순간적으로 보이는 문제로 추가)
        let animationDuration = notiInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! TimeInterval
        
        UIView.animate(withDuration: animationDuration, animations: { [weak self] in
            self?.view.layoutIfNeeded()
        }) { (Bool) in
            
        }
}

@objc func keyboardWillHide(noti: NSNotification) {
		let notiInfo = noti.userInfo! as NSDictionary
        self.bottomConstraint.constant = 0
        
        let animationDuration = notiInfo[UIResponder.keyboardAnimationDurationUserInfoKey] as! TimeInterval
        UIView.animate(withDuration: animationDuration, animations: { [weak self] in
            self?.view.layoutIfNeeded()
        }) { (Bool) in
            
        }
}

/////////////////////////////////////////////////
// NotificationCenter 백그라운드 및 포그라운드 Noti 등록

// 포그라운드
NotificationCenter.default.addObserver(self, selector: #selector(onDidBecomeActive(not:)), name: UIApplication.didBecomeActiveNotification, object: nil)
// 백그라운드
NotificationCenter.default.addObserver(self, selector: #selector(onDidEnterBackgroundActive(not:)), name: UIApplication.didEnterBackgroundNotification, object: nil)

// NotificationCenter 삭제
NotificationCenter.default.removeObserver(self, name: UIApplication.didBecomeActiveNotification, object: nil)
NotificationCenter.default.removeObserver(self, name: UIApplication.didEnterBackgroundNotification, object: nil)

@objc func onDidBecomeActive(not: Notification) {
			...... 이하 생략 ......
}

 사용자 NotificationCenter

//////////////////////////////////////////////////
// NotificationCenter User Noti 등록
NotificationCenter.default.addObserver(self, selector: #selector(UserCustomReceived(noti:)), name: NSNotification.Name(rawValue: "UserCustomNotification"), object: nil)

// NotificationCenter 삭제
NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: "UserCustomNotification"), object: nil)

// NotificationCenter User 데이터 전송
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "UserCustomNotification"), object: (self?.view.frame.height, height), userInfo: nil)

@objc func UserCustomReceived(noti: Notification){
	let height:(viewHeight: CGFloat, playerHeight: CGFloat) = noti.object as! (CGFloat, CGFloat)
}