水平滑入式菜单

Question

我是 iOS/Swift 开发的新手，我正在尝试实现一个水平滑入式菜单（用于用户设置）。

我已经设法让它工作，我面临的问题是，菜单从右到左滑动，但它应该反过来，即从左到右。我尝试过使用正值和负值，但我仍然对这些 CG 属性如何工作（轴 x、y 等）感到有些困惑。

这是我的代码，负责显示菜单：

     private func showSettingsMenu(){
        if let window = UIApplication.shared.keyWindow {

        blackView.backgroundColor = UIColor(white: 0, alpha: 0.7)

        blackView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleDismiss)))

        window.addSubview(blackView)
        window.addSubview(collectionView)

        blackView.frame = window.frame
        blackView.alpha = 0

        let collectionWidth: CGFloat = window.frame.width * 0.75
        let x = window.frame.width - collectionWidth

        collectionView.frame = CGRect(x: window.frame.width, y: 0, width: collectionWidth, height: window.frame.height)

        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {

            self.blackView.alpha = 1
            self.collectionView.frame = CGRect(x: x, y: 0, width: self.collectionView.frame.width, height: self.collectionView.frame.height)

        }, completion: nil)
    }
}

Answer 1

问题是您将初始 x 位置设置为屏幕宽度，将最终位置设置为屏幕宽度的 1/4，因此它从右向左滑动：

let collectionWidth: CGFloat = window.frame.width * 0.75

collectionView.frame = CGRect(x: -1 * collectionWidth , y: 0, width: collectionWidth, height: window.frame.height)

UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {

   self.blackView.alpha = 1

   self.collectionView.frame = CGRect(x: 0, y: 0, width: self.collectionView.frame.width, height: self.collectionView.frame.height)

}, completion: nil)

编辑更改行

 collectionView.frame = CGRect(x: window.frame.width, y: 0, width: collectionWidth, height: window.frame.height)

到

collectionView.frame = CGRect(x: -1 * collectionWidth , y: 0, width: collectionWidth, height: window.frame.height)

/// 内动画换线

 self.collectionView.frame = CGRect(x: x, y: 0, width: self.collectionView.frame.width, height: self.collectionView.frame.height)

到

 self.collectionView.frame = CGRect(x: 0, y: 0, width: self.collectionView.frame.width, height: self.collectionView.frame.height)