iOS) alert(알림) 만들기

	let alert = UIAlertController(title: "알림", message: "띠리링~~~~", preferredStyle: UIAlertController.Style.alert)
	let okAction = UIAlertAction(title: "OK", style: .default) { (action) in
	//OK 버튼 누른뒤 수행할 코드
	}
	alert.addAction(okAction)
	present(alert, animated: false, completion: nil)

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