swift - 如何在 cocoa 中转换 NSImageView？

Question

我正在与 cocoa 作斗争。我正在尝试将这段动画从 iOS 写入 cocoa 。这个想法是稍微减小 NSImageView 的大小，并在动画完成后，将其再次增加到原始大小。这样看起来就好像按钮(图片)被按下一样。

@IBOutlet weak var vpnButton: NSImageView!

@objc func vpnButtonPressed(pressedGestureRecognizer: UILongPressGestureRecognizer) {
        UserDefaults.standard.set(true, forKey: Constants.vpnButtonTapped)
        if (pressedGestureRecognizer.state == .began) {
            UIView.animate(withDuration: 0.15, animations: {() -> Void in
                self.vpnButton?.transform = CGAffineTransform(scaleX: 0.965, y: 0.965)})
        } else if (pressedGestureRecognizer.state == .ended) {
            UIView.animate(withDuration: 0.15, animations: {() -> Void in
                self.vpnButton.isHighlighted = !self.vpnButton.isHighlighted
                self.vpnButton?.transform = CGAffineTransform(scaleX: 1, y: 1)})
        }
    }

在 cocoa 中，我能够找到 clickGesture。我不确定这是否是最好的选择。

所以我想出了这个:

@objc func vpnButtonPressed(clickedGestureRecognizer: NSGestureRecognizer) {
        UserDefaults.standard.set(true, forKey: Constants.vpnButtonTapped)
        print("clicked")
        NSAnimationContext.runAnimationGroup({_ in
            //Indicate the duration of the animation
            NSAnimationContext.current.duration = 0.5
            var transform = CGAffineTransform(scaleX: 0.965, y: 0.965)
            self.vpnButton.layer?.setAffineTransform(transform)
        }, completionHandler:{
//            var transform = self.vpnButton.layer?.affineTransform()
//            transform = CGAffineTransform(scaleX: 1, y: 1)
//            self.vpnButton.layer?.setAffineTransform(transform!)
            print("Animation completed")
        })
    }

通过将图像稍微移到一边，此方法仅起作用一次，但不会使其变小。如果我取消注释完成处理程序中的三行，我也看不到动画将其移回原处。

Answer 1

据我了解，您需要类似以下内容的内容(如果需要，发送操作本身超出范围 - 这里只是动画)

class MyImageView: NSImageView {

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        self.wantsLayer = true
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)
        self.wantsLayer = true
    }

    override func mouseDown(with event: NSEvent) {
        NSAnimationContext.runAnimationGroup({ (context) in
          context.duration = 0.15
          self.layer?.setAffineTransform(CGAffineTransform(scaleX: 0.965, y: 0.965))
        })
    }

    override func mouseUp(with event: NSEvent) {
        NSAnimationContext.runAnimationGroup({ (context) in
          context.duration = 0.15
          self.layer?.setAffineTransform(.identity)
        })
    }
}