2.swift

class CustomPresentAnimation: NSObject , UIViewControllerAnimatedTransitioning {
	
	var startPoint: CGPoint // 擴散的起始點
	private let durationTime = 0.45 // 動畫時間
	
    init(startPoint: CGPoint) {
        self.startPoint = startPoint
        super.init()
    }
	
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return durationTime
    }
    
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        // ...
    }
}