ios - 如何使用像 TikTok App 这样的平移手势来缩放相机

Question

我正在开发录像机应用程序，我想要像 Titok 这样的功能，例如在平移手势上，他们正在缩放相机我使用了以下代码，但使用此代码我可以通过拖动进行缩放，这是不可行的我想继续放大和缩小。

@objc func previewPan(recognizer:UIPanGestureRecognizer) {
        viewShoot.isHidden = false
        //DispatchQueue.main.async {


        if recognizer.state == UIGestureRecognizerState.began {

            //self.StartRecording()

            //self.startPoint = recognizer.location(in: self.viewShoot)
            startPoint = recognizer.location(in: self.viewAnimate)

            self.zoomAtStart = self.recorder.videoZoomFactor

        } else if recognizer.state == UIGestureRecognizerState.changed {

            //let newPoint = recognizer.location(in: self.viewShoot)
            let newPoint = recognizer.location(in: self.viewAnimate)

            let scale = self.startPoint.y / newPoint.y
            var newZoom = scale * self.zoomAtStart

            if newZoom > self.maxZoomFactor {
                newZoom = self.maxZoomFactor
            } else if newZoom < self.minZoomFactor {
                newZoom = self.minZoomFactor
            }
            self.recorder.videoZoomFactor = newZoom

            //------->
            //self.viewShoot.isHidden = false
            //self.viewAnimate.isHidden = false

            //self.view.bringSubview(toFront: self.viewShoot)
            self.view.bringSubview(toFront: self.viewAnimate)

            let translation = recognizer.translation(in: self.view)

            //self.viewShoot.center = CGPoint(x: self.viewShoot.center.x + translation.x, y: self.viewShoot.center.y + translation.y)
            self.viewAnimate.center = CGPoint(x: self.viewAnimate.center.x + translation.x, y: self.viewAnimate.center.y + translation.y)


            recognizer.setTranslation(CGPoint.zero, in: self.view)

        } else if recognizer.state == UIGestureRecognizerState.ended {

            //self.StopRecording()

            UIView.animate(withDuration: 0.250) {
                //self.viewShoot.frame = self.originalPossion
                self.viewAnimate.frame = self.originalPossion
            }
        }
        //}
    }

请帮忙!

Answer 1

我已经使用 NextLevelZoom 解决了这个问题