因此,最近我一直在尝试在 Swift 3 中实现将摄像头 View 从后摄像头切换到前置摄像头的功能。但是,没有运气。
目前,我的默认 View 来自后置摄像头 - 我可以用它拍照然后重拍。但是任何人都可以帮助我并展示如何双击屏幕切换相机或简单地使用分配的按钮来切换它们吗?谢谢!
import UIKit
import AVFoundation
import FirebaseDatabase
class CameraView: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
override var prefersStatusBarHidden: Bool {
return true
}
var captureSession : AVCaptureSession!
var stillImageOutput : AVCaptureStillImageOutput!
var previewLayer : AVCaptureVideoPreviewLayer!
@IBOutlet var cameraView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = cameraView.bounds
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSessionPreset1920x1080
var backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var error : NSError?
do {
var input = try! AVCaptureDeviceInput(device: backCamera)
if (error == nil && captureSession?.canAddInput(input) != nil) {
captureSession?.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if (captureSession?.canAddOutput(stillImageOutput) != nil) {
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer (session: captureSession)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer.connection.videoOrientation = AVCaptureVideoOrientation.portrait
cameraView.layer.addSublayer(previewLayer)
captureSession?.startRunning() }
}
} catch {
}
}
@IBOutlet var tempImageView: UIImageView!
@IBAction func didPressTakePhoto(_ sender: UIButton) {
if let videoConnection = stillImageOutput.connection(withMediaType: AVMediaTypeVideo) {
videoConnection.videoOrientation = AVCaptureVideoOrientation.portrait
stillImageOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: {
(sampleBuffer, error) in
if sampleBuffer != nil {
var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
var dataProvider = CGDataProvider.init(data: imageData as! CFData)
var cgImageRef = CGImage.init(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
var image = UIImage (cgImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.right)
self.tempImageView.image = image
self.tempImageView.isHidden = false
}
})
}
}
var didTakePhoto = Bool()
@IBAction func didPressTakeAnother(_ sender: UIButton) {
if didTakePhoto == true {
tempImageView.isHidden = true
didTakePhoto = false
} else {
captureSession?.startRunning()
didTakePhoto = true
}
}
}
最佳答案
在这里看不到任何问题 - 这是有效的解决方案:
import Foundation
import UIKit
import AVFoundation
class MainViewController: UIViewController {
var tempImage: UIImageView?
var captureSession: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var videoPreviewLayer: AVCaptureVideoPreviewLayer?
var currentCaptureDevice: AVCaptureDevice?
var usingFrontCamera = false
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
loadCamera()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
videoPreviewLayer!.frame = self.cameraPreviewSurface.bounds
}
@IBAction func switchButtonAction(_ sender: Any) {
usingFrontCamera = !usingFrontCamera
loadCamera()
}
func getFrontCamera() -> AVCaptureDevice?{
let videoDevices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo)
for device in videoDevices!{
let device = device as! AVCaptureDevice
if device.position == AVCaptureDevicePosition.front {
return device
}
}
return nil
}
func getBackCamera() -> AVCaptureDevice{
return AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
}
func loadCamera() {
if(captureSession == nil){
captureSession = AVCaptureSession()
captureSession!.sessionPreset = AVCaptureSessionPresetPhoto
}
var error: NSError?
var input: AVCaptureDeviceInput!
currentCaptureDevice = (usingFrontCamera ? getFrontCamera() : getBackCamera())
do {
input = try AVCaptureDeviceInput(device: currentCaptureDevice)
} catch let error1 as NSError {
error = error1
input = nil
print(error!.localizedDescription)
}
for i : AVCaptureDeviceInput in (self.captureSession?.inputs as! [AVCaptureDeviceInput]){
self.captureSession?.removeInput(i)
}
if error == nil && captureSession!.canAddInput(input) {
captureSession!.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput?.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if captureSession!.canAddOutput(stillImageOutput) {
captureSession!.addOutput(stillImageOutput)
videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoPreviewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
videoPreviewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
//self.cameraPreviewSurface.layer.sublayers?.forEach { $0.removeFromSuperlayer() }
self.cameraPreviewSurface.layer.addSublayer(videoPreviewLayer!)
DispatchQueue.main.async {
self.captureSession!.startRunning()
}
}
}
}
}
一些注意事项:
cameraPreviewSurface
- 这是您的 UIView,相机将在其中显示
不要重新分配 session ,不要只是添加输入,而是在添加新的之前 - 删除现有的,
附注使用 swift 3.0.1/xcode 8.1 完成的代码
干杯)
关于ios - 双击或使用按钮将相机从后切换到前(Xcode 8、Swift 3),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39693187/