ios - Swift 中的幻灯片转场

Question

我正在尝试创建一个水平滑动的segue，可以从一个 View 平移到下一个 View 。我向下平移，但它在应该显示下一个 View Controller 的区域中显示了一个黑色空间。这就是我实现 segue 的方式

class SlideSegue: UIStoryboardSegue {

    enum Direction {
        case Left
        case Right
    }

    // MARK: - Properties
    var direction = Direction.Left

    // MARK: -
    override func perform() {
        let srcVc = self.sourceViewController
        let destVc = self.destinationViewController


        let destView = destVc.view.snapshotViewAfterScreenUpdates(true)
        var frame = destView.frame
        frame.origin.x = CGFloat(valForDirection()) * srcVc.view.frame.width
        destView.frame = frame
        srcVc.view.addSubview(destView)

        UIView.animateWithDuration(0.3, animations: { () -> Void in
            let x = CGFloat(self.valForDirection()) * srcVc.view.bounds.width
            let slide = CGAffineTransformMakeTranslation(x, 0)
            srcVc.view.transform = slide
            }) { (finished: Bool) -> Void in
                srcVc.presentViewController(destVc, animated: false, completion: nil)

                destView.removeFromSuperview()
        }

    }

    func valForDirection() -> Int {
        return direction == Direction.Left ? -1 : 1
    }

}

class SlideLeftSegue: SlideSegue {
    override func perform() {
        self.direction = Direction.Left
        super.perform()
    }
}

class SlideRightSegue: SlideSegue {
    override func perform() {
        self.direction = Direction.Right
        super.perform()
    }
}

编辑

编辑(已解决) 这是最终的工作解决方案，感谢下面的两个答案

class SlideSegue: UIStoryboardSegue {

    enum Direction: Int {
        case Left = 1
        case Right = -1
    }

    // MARK: - Properties
    var direction = Direction.Left

    // MARK: -
    override func perform() {
        let srcVc = self.sourceViewController
        let destVc = self.destinationViewController


        let destView = destVc.view.snapshotViewAfterScreenUpdates(true)
        var frame = destView.frame
        frame.origin.x = CGFloat(direction.rawValue) * srcVc.view.frame.width
        destView.frame = frame
        srcVc.view.addSubview(destView)

        UIView.animateWithDuration(0.3, animations: { () -> Void in
            let x = -CGFloat(self.direction.rawValue) * srcVc.view.bounds.width
            let slide = CGAffineTransformMakeTranslation(x, 0)
            srcVc.view.transform = slide
            }) { (finished: Bool) -> Void in
                srcVc.presentViewController(destVc, animated: false, completion: nil)

                destView.removeFromSuperview()
        }

    }

}

class SlideLeftSegue: SlideSegue {
    override func perform() {
        self.direction = Direction.Left
        super.perform()
    }
}

class SlideRightSegue: SlideSegue {
    override func perform() {
        self.direction = Direction.Right
        super.perform()
    }
}

Answer 1

我测试了以下修改，效果很好。

func valForDirection() -> Int {
    return direction == Direction.Left ? 1 : -1
}

如果向左滑动，destView的originX应该是它的宽度。否则-宽度。