swift3.0设置页面显示风格

显示风格有：

    1.currentContext

    2.formSheet

    3.fullScreen

    4.none

    5.overCurrentContext

    6.overFullScreen

    7.pageSheet

//跳转页面变设置ViewController的显示风格

let storyboard = UIStoryboard(name: "Setting", bundle: nil)

let controller = storyboard.instantiateInitialViewController()

controller?.modalPresentationStyle = .pageSheet

self.view.window?.rootViewController?.present(controller!, animated: true, completion: nil)