如何将 AVCaptureVideoPreviewLayer 旋转 90 度以在 iOS11 中更正它?
How to rotate a AVCaptureVideoPreviewLayer by 90 degrees to correct it in iOS11?
我有一个 AVCaptureVideoPreviewLayer
设置为使用前置摄像头源捕获会话的实时预览。但是,输出旋转了 90 度,我试图让图层与我的应用程序的其余部分对齐,这是 Landscape
方向。有没有办法将它旋转 90 degrees
以更正它?
到目前为止,这是我的代码:
override func viewDidLoad() {
super.viewDidLoad()
let captureSession = AVCaptureSession()
guard let captureDevice = getDevice(position: .front) else { return }
guard let input = try? AVCaptureDeviceInput(device: captureDevice) else { return }
captureSession.addInput(input)
captureSession.startRunning()
let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
previewLayer.frame = view.frame
previewLayer.videoGravity = .resizeAspectFill
previewLayer.connection?.automaticallyAdjustsVideoMirroring = false
previewLayer.connection?.isVideoMirrored = false
}
func getDevice(position: AVCaptureDevice.Position) -> AVCaptureDevice? {
let devices = AVCaptureDevice.devices() as NSArray;
for de in devices {
let deviceConverted = de as! AVCaptureDevice
if(deviceConverted.position == position){
return deviceConverted
}
}
return nil
}
你能把 previewLayer
加到另一个 UIView
上吗,然后像这样旋转:
private var captureView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.captureView = UIView(frame: self.view.bounds)
self.captureView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.view.addSubview(captureView)
// ...
captureView.layer.addSublayer(previewLayer)
// ...
self.rotateView(animated: false)
}
// Rotating captureView based on device orientation
func rotateView(animated: Bool) {
var transform: CGAffineTransform?
switch UIDevice.current.orientation {
case .portraitUpsideDown:
transform = CGAffineTransform(rotationAngle: CGFloat.pi)
case .landscapeLeft:
transform = CGAffineTransform(rotationAngle: CGFloat.pi / 2)
case .landscapeRight:
transform = CGAffineTransform(rotationAngle: -CGFloat.pi / 2)
default:
break
}
guard animated else {
self.captureView.transform(transform)
return
}
UIView.animate(withDuration: 0.5, animations: {[weak self] in
self?.captureView.transform(transform)
})
}
我有一个 AVCaptureVideoPreviewLayer
设置为使用前置摄像头源捕获会话的实时预览。但是,输出旋转了 90 度,我试图让图层与我的应用程序的其余部分对齐,这是 Landscape
方向。有没有办法将它旋转 90 degrees
以更正它?
到目前为止,这是我的代码:
override func viewDidLoad() {
super.viewDidLoad()
let captureSession = AVCaptureSession()
guard let captureDevice = getDevice(position: .front) else { return }
guard let input = try? AVCaptureDeviceInput(device: captureDevice) else { return }
captureSession.addInput(input)
captureSession.startRunning()
let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
previewLayer.frame = view.frame
previewLayer.videoGravity = .resizeAspectFill
previewLayer.connection?.automaticallyAdjustsVideoMirroring = false
previewLayer.connection?.isVideoMirrored = false
}
func getDevice(position: AVCaptureDevice.Position) -> AVCaptureDevice? {
let devices = AVCaptureDevice.devices() as NSArray;
for de in devices {
let deviceConverted = de as! AVCaptureDevice
if(deviceConverted.position == position){
return deviceConverted
}
}
return nil
}
你能把 previewLayer
加到另一个 UIView
上吗,然后像这样旋转:
private var captureView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.captureView = UIView(frame: self.view.bounds)
self.captureView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.view.addSubview(captureView)
// ...
captureView.layer.addSublayer(previewLayer)
// ...
self.rotateView(animated: false)
}
// Rotating captureView based on device orientation
func rotateView(animated: Bool) {
var transform: CGAffineTransform?
switch UIDevice.current.orientation {
case .portraitUpsideDown:
transform = CGAffineTransform(rotationAngle: CGFloat.pi)
case .landscapeLeft:
transform = CGAffineTransform(rotationAngle: CGFloat.pi / 2)
case .landscapeRight:
transform = CGAffineTransform(rotationAngle: -CGFloat.pi / 2)
default:
break
}
guard animated else {
self.captureView.transform(transform)
return
}
UIView.animate(withDuration: 0.5, animations: {[weak self] in
self?.captureView.transform(transform)
})
}