在导航控制器中关闭视图后，应用程序崩溃是可以在导航控制器展开期间重新加载单元格。
如果点击了翻转按钮，则相机会发生变化，但是当点按相机按钮时，应用程序会因此错误而崩溃
没有有效且已启用的视频连接
可能出现的问题
import UIKit
import AVFoundation
protocol previewSegueDelegate {
func previewSegueDelegate(image:UIImage,device:AVCaptureDevice)
}
class MainCameraCollectionViewCell: UICollectionViewCell {
var gdelegate: gestureDelegate?
var pdelegate: previewSegueDelegate?
@IBOutlet weak var myView: UIView!
var captureSession = AVCaptureSession()
private var sessionQueue: DispatchQueue!
var captureConnection = AVCaptureConnection()
var currentCamera: AVCaptureDevice?
var photoOutPut: AVCapturePhotoOutput?
var cameraPreviewLayer: AVCaptureVideoPreviewLayer?
var image: UIImage?
var usingFrontCamera = false
override func awakeFromNib() {
super.awakeFromNib()
setupCaptureSession()
setupDevice()
setupInput()
setupPreviewLayer()
startRunningCaptureSession()
print("Inside of camera cell")
}
func setupCaptureSession(){
captureSession.sessionPreset = AVCaptureSession.Preset.photo
sessionQueue = DispatchQueue(label: "session queue")
}
func setupDevice(usingFrontCamera:Bool = false){
sessionQueue.async {
let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
let devices = deviceDiscoverySession.devices
for device in devices{
if usingFrontCamera && device.position == AVCaptureDevice.Position.front {
self.currentCamera = device
} else if device.position == AVCaptureDevice.Position.back {
self.currentCamera = device
}
}
}
}
func setupInput() {
sessionQueue.async {
do {
let captureDeviceInput = try AVCaptureDeviceInput(device: self.currentCamera!)
if self.captureSession.canAddInput(captureDeviceInput) {
self.captureSession.addInput(captureDeviceInput)
}
self.photoOutPut = AVCapturePhotoOutput()
self.photoOutPut?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format:[AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
if self.captureSession.canAddOutput(self.photoOutPut!) {
self.captureSession.addOutput(self.photoOutPut!)
}
} catch {
print(error)
}
}
}
func setupPreviewLayer(){
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewLayer?.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
self.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}
func startRunningCaptureSession(){
captureSession.startRunning()
}
@IBAction func cameraButton_TouchUpInside(_ sender: Any) {
let settings = AVCapturePhotoSettings()
photoOutPut?.capturePhoto(with: settings, delegate: self as AVCapturePhotoCaptureDelegate)
print("camera button touched")
}
@IBAction func FlipThe_camera(_ sender: UIButton) {
print("Flip Touched")
captureSession.beginConfiguration()
if let inputs = captureSession.inputs as? [AVCaptureDeviceInput] {
for input in inputs {
captureSession.removeInput(input)
}
}
usingFrontCamera = !usingFrontCamera
setupCaptureSession()
setupDevice(usingFrontCamera: usingFrontCamera)
setupInput()
captureSession.commitConfiguration()
startRunningCaptureSession()
}
}
extension MainCameraCollectionViewCell:
AVCapturePhotoCaptureDelegate{
func photoOutput(_ output: AVCapturePhotoOutput,
didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation(){
print(imageData)
image = UIImage(data: imageData)
if(self.image == nil){
print("The image is empty")
}
pdelegate?.previewSegueDelegate(image: self.image!, device:
currentCamera!)
}
}
}
答案 0 :(得分：0)
我相信你需要使用：
captureSesssion.sessionPreset = AVCaptureSessionPresetPhoto
答案由Aleksey Timoshchenko发现HERE
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCapturePhotoCaptureDelegate {
var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!
@IBOutlet weak var capturedImage: UIImageView!
@IBOutlet weak var previewView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
captureSesssion = AVCaptureSession()
captureSesssion.sessionPreset = AVCaptureSessionPresetPhoto
cameraOutput = AVCapturePhotoOutput()
let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
if let input = try? AVCaptureDeviceInput(device: device) {
if (captureSesssion.canAddInput(input)) {
captureSesssion.addInput(input)
if (captureSesssion.canAddOutput(cameraOutput)) {
captureSesssion.addOutput(cameraOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
previewLayer.frame = previewView.bounds
previewView.layer.addSublayer(previewLayer)
captureSesssion.startRunning()
}
} else {
print("issue here : captureSesssion.canAddInput")
}
} else {
print("some problem here")
}
}
// Take picture button
@IBAction func didPressTakePhoto(_ sender: UIButton) {
let settings = AVCapturePhotoSettings()
let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
let previewFormat = [
kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
kCVPixelBufferWidthKey as String: 160,
kCVPixelBufferHeightKey as String: 160
]
settings.previewPhotoFormat = previewFormat
cameraOutput.capturePhoto(with: settings, delegate: self)
}
// callBack from take picture
func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {
if let error = error {
print("error occure : \(error.localizedDescription)")
}
if let sampleBuffer = photoSampleBuffer,
let previewBuffer = previewPhotoSampleBuffer,
let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
print(UIImage(data: dataImage)?.size as Any)
let dataProvider = CGDataProvider(data: dataImage as CFData)
let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.right)
self.capturedImage.image = image
} else {
print("some error here")
}
}
// This method you can use somewhere you need to know camera permission state
func askPermission() {
print("here")
let cameraPermissionStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
switch cameraPermissionStatus {
case .authorized:
print("Already Authorized")
case .denied:
print("denied")
let alert = UIAlertController(title: "Sorry :(" , message: "But could you please grant permission for camera within device settings", preferredStyle: .alert)
let action = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(action)
present(alert, animated: true, completion: nil)
case .restricted:
print("restricted")
default:
AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo, completionHandler: {
[weak self]
(granted :Bool) -> Void in
if granted == true {
// User granted
print("User granted")
DispatchQueue.main.async(){
//Do smth that you need in main thread
}
}
else {
// User Rejected
print("User Rejected")
DispatchQueue.main.async(){
let alert = UIAlertController(title: "WHY?" , message: "Camera it is the main feature of our application", preferredStyle: .alert)
let action = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(action)
self?.present(alert, animated: true, completion: nil)
}
}
});
}
}
}