Custom Height for Delete (Swipe to Delete). Swift 3.X

CustomTableViewCell.swift

override func layoutSubviews() {
        super.layoutSubviews()
        var subviews: [Any] = self.subviews
        let subview = subviews[0] as! UIView
        if subview.classForCoder.debugDescription() == "UITableViewCellDeleteConfirmationView" {
            subview.frame.size.height = 50
            subview.frame.origin.y = 10
            subview.clipsToBounds = true
            subview.layer.masksToBounds = true
        }

    }
//Add the above code into your custom tableview cell swift file. Change the height and y value to change the position.