UIView.animate(withDuration: 0.3) { self.view.alpha = 0 } completion: { _ in self.view.removeFromSuperview() }
animations: は書かないけど completion: は書くの？UIView.animate(withDuration: 0.3) { self.view.alpha = 0 } completion: { _ in self.view.removeFromSuperview() }
animations: は書かないけど completion: は書くの？animations が本体で completion は付随する処理てきなイメージなのかな？そういう場合に使う想定？