camera ios 10.2，swift 3

Question

我试着在iOS10.2中用swift 3创建一个类似Snapchat的摄像头，但问题是当我在iPhone中运行这个应用程序时。UIView显示为空。这是我的代码。

import UIKit
import AVFoundation

class TakeSelfieViewController: UIViewController {

@IBOutlet var cameraView: UIView!

var captureSession : AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer : AVCaptureVideoPreviewLayer?

override func viewDidLoad() {
    super.viewDidLoad()

    captureSession = AVCaptureSession()
    captureSession?.sessionPreset = AVCaptureSessionPreset1920x1080
    let deviceDiscoverySession = AVCaptureDeviceDiscoverySession(deviceTypes: [AVCaptureDeviceType.builtInDuoCamera, AVCaptureDeviceType.builtInTelephotoCamera,AVCaptureDeviceType.builtInWideAngleCamera], mediaType: AVMediaTypeVideo, position: AVCaptureDevicePosition.front)
    for device in (deviceDiscoverySession?.devices)! {
        if device.position == AVCaptureDevicePosition.front{
            do {
                let input = try AVCaptureDeviceInput(device: device)
                if (captureSession?.canAddInput(input))!{
                    captureSession?.addInput(input)
                    stillImageOutput = AVCaptureStillImageOutput()
                    stillImageOutput?.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
                    if (captureSession?.canAddOutput(stillImageOutput))! {
                        captureSession?.addOutput(stillImageOutput)
                        previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                        previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
                        previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
                        cameraView.layer.addSublayer(previewLayer!)
                        captureSession?.startRunning()
                    }
                }
            } catch{
                print("Error Occured when trying get camera")
            }
        }
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override var prefersStatusBarHidden: Bool {

    return true

}

在我的Info.plist中，我添加了隐私摄像头使用说明

发生什么事了呢？

Answer 1

在iOS10和更高版本中使用swift3代码拍照非常容易，只需看这里，首先你需要展示picker.In iOS10版本的图像，你应该获得从库中访问相机和照片的许可。

您可以将这些delgate添加到您的类中

            import UIKit

         class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {

Info.plist文件您可以访问这些内容1.隐私-照片库使用描述2.隐私-相机使用访问

        func cameraAction(_ sender: AnyObject) {
              if UIImagePickerController 
        .isSourceTypeAvailable(UIImagePickerControllerSourceType.camera){
        let imagePicker = UIImagePickerController()
        imagePicker.delegate=self
        imagePicker.sourceType = UIImagePickerControllerSourceType.camera
        imagePicker.allowsEditing = true
        self .present(imagePicker, animated: true, completion: nil)
    }

  }

在这里，你可以在下面的代码中使用UIImageView imageView，它用于显示你从图库或相机中选择的图像

  func imagePickerController(_ picker: UIImagePickerController,    didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage{
        imageView.image = image
        imageView.contentMode = .scaleAspectFit
        self.dismiss(animated: true, completion: nil)
    }

}

您可以从移动相册中的库中获取照片

       func photosFromLibrary(_ sender: AnyObject) {
    if UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary){
        let imagePicker = UIImagePickerController()
        imagePicker.delegate=self
        imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
        imagePicker.allowsEditing = true
        self .present(imagePicker, animated: true, completion: nil)
    }

}

Answer 2

您需要设置previewLayer的框架。

previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.frame = cameraView.frame // this line is new
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect