我试图将捏缩放添加到以编程方式添加的相机预览层。我在下面将此代码用作函数,但是从提示中可以看到所有这些。我没有其他与此相关的代码。我找不到更多有关它们似乎都集中在静止图像上的信息。
override func viewDidLoad() {
super.viewDidLoad()
let pinchRecognizer = UIPinchGestureRecognizer(target: self, action:#selector(pinch(_:)))
pinchRecognizer.delegate = self
self.cameraPreviewlayer.addGestureRecognizer(pinchRecognizer)
}
我在这条线上出现错误
self.cameraPreviewlayer.addGestureRecognizer(pinchRecognizer)
它说cameraPreviewLayer没有添加geture。
这是功能。
@objc func pinch(_ pinch: UIPinchGestureRecognizer) {
let device = videoDeviceInput.device
// Return zoom value between the minimum and maximum zoom values
func minMaxZoom(_ factor: CGFloat) -> CGFloat {
return min(min(max(factor, minimumZoom), maximumZoom), device.activeFormat.videoMaxZoomFactor)
}
func update(scale factor: CGFloat) {
do {
try device.lockForConfiguration()
defer { device.unlockForConfiguration() }
device.videoZoomFactor = factor
} catch {
print("\(error.localizedDescription)")
}
}
let newScaleFactor = minMaxZoom(pinch.scale * lastZoomFactor)
switch pinch.state {
case .began: fallthrough
case .changed: update(scale: newScaleFactor)
case .ended:
lastZoomFactor = minMaxZoom(newScaleFactor)
update(scale: lastZoomFactor)
default: break
}
}
最佳答案
我能够解决这个问题。
我所要做的就是移动
let pinchRecognizer = UIPinchGestureRecognizer(target: self, action:#selector(pinch(_:)))
pinchRecognizer.delegate = self
self.cameraPreviewlayer.addGestureRecognizer(pinchRecognizer)
从视图加载到我设置相机预览层的位置。
cameraPreviewlayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewlayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewlayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewlayer?.frame = self.view.frame
// scanArea.setRegionOfInterestWithProposedRegionOfInterest(regionOfInterest)
self.view.layer.insertSublayer(cameraPreviewlayer!, at: 0)
let pinchRecognizer = UIPinchGestureRecognizer(target: self, action:#selector(pinch(_:)))
pinchRecognizer.delegate = self
self.view.addGestureRecognizer(pinchRecognizer)