在modal viewcontroller外点击屏幕dismiss

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自定义转场动画，弹出modalViewController，然后点击周围可以dismiss掉。
我的实现方法是：给self.view.window添加一个tap，在手势的代理中判断点击是否在controller内。

let tap = UITapGestureRecognizer(target: self, action: #selector(你的响应方法，实现为空即可))    override func viewDidAppear(_ animated: Bool) {        super.viewDidAppear(animated)        tap.delegate = self        self.view.window?.addGestureRecognizer(tap)    }    override func viewWillDisappear(_ animated: Bool) {        super.viewWillDisappear(animated)        tap.delegate = nil        self.view.window?.removeGestureRecognizer(tap)    }

实际的操作在这里：

extension XZBasicViewController: UIGestureRecognizerDelegate {    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {        let point = gestureRecognizer.location(in: self.view)        if !self.view.point(inside: point, with: nil) {            self.navigationController?.dismiss(animated: true, completion: {            })            return true        }        return false    }}

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