自定义展开 segue 动画显示问题

Question

我正在制作我的第一个自定义 segue 动画。我想要的是有一个列表视图，当我在一行上选择时，它不是从侧面滑入，而是从所选行中展开到位。比如：

所以用户选择了绿色行，这会导致新控制器以绿色行大小开始并展开以填满屏幕。到目前为止，这部分运行良好。

我遇到的问题是 unwind segue 试图做相反的事情，将全屏缩小到原始行然后关闭。发生的情况是它缩小得很好，但暴露的区域仍然是黑色，然后在动画完成时突然闪烁到位。想要的是这样的：

但是发生的事情更像是这样的：

我用于展开的perform 的代码如下：

class FromScheduleFocusSegue: UIStoryboardSegue {
    override func perform() {
        let fromView = self.source.view!
        let toView = self.destination.view!
        let window = UIApplication.shared.keyWindow!
        let schedulesList = self.destination as! SchedulesListController
        let cell = schedulesList.tableView.cellForRow(at: schedulesList.tableView.indexPathForSelectedRow!)!
        var stripe = cell.bounds
        stripe.size.height = 60
        let targetFrame = cell.convert(stripe, to: window).insetBy(dx: 0, dy: 0)
        schedulesList.tableView.selectRow(at: nil, animated: false, scrollPosition: .none)
        UIView.animateWithDuration(4000.milliseconds, delay: 0.seconds, options: .curveEaseInOut, animations: {
            fromView.frame = targetFrame
        }) { (finished) in
            self.source.dismiss(animated: false, completion: nil)
        }
    }
}

所以基本上，我如何让我正在展开的视图在动画发生时显示出来？

为了完整起见，这里是前向 segue 代码：

class ToScheduleFocusSegue: UIStoryboardSegue {
    override func perform() {
        let fromView = self.source.view!
        let toView = self.destination.view!
        let window = UIApplication.shared.keyWindow!
        let box = UIScreen.main.bounds
        let schedulesList = self.source as! SchedulesListController
        let cell = schedulesList.tableView.cellForRow(at: schedulesList.tableView.indexPathForSelectedRow!)!
        toView.frame = cell.convert(cell.bounds, to: window).insetBy(dx: 0, dy: 0)
        window.insertSubview(toView, aboveSubview: fromView)
        UIView.animateWithDuration(4000.milliseconds, delay: 0.seconds, options: .curveEaseInOut, animations: {
            toView.frame = box
            }) { (finished) in
                self.source.present(self.destination, animated: false, completion: nil)
        }
    }
}

（这是在XCode8中，针对iOS10使用Swift3）

Answer 1

尝试让执行演示的视图控制器也执行关闭。

所以在你放松的过程中：

UIView.animateWithDuration(4000.milliseconds, delay: 0.seconds, options: .curveEaseInOut, animations: {
        fromView.frame = targetFrame
    }) { (finished) in
        self.destination.dismiss(animated: false, completion: nil) // the destination is the one that presented the current view
    }