我正在尝试学习如何使用AVFoundation拍摄和保存照片.我目前能够使用一个链接到拍摄动作的按钮来制作自定义相机视图.当我单击按钮时,没有调用委托方法.
这是我的ViewController.swift:
class ViewController: UIViewController, AVCapturePhotoCaptureDelegate{
@IBOutlet weak var camerView: UIView!
@IBOutlet weak var photoButton: UIButton!
var captureSession : AVCaptureSession?
var sessionOutput : AVCapturePhotoOutput?
var previewLayer : AVCaptureVideoPreviewLayer?
var photoSettings : AVCapturePhotoSettings?
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
previewLayer?.frame = (self.camerView?.bounds)!
previewLayer?.position = CGPoint(x: (self.camerView?.frame.width)! / 2, y: (self.camerView?.frame.height)!/2)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//Capture Session
captureSession = AVCaptureSession()
let devices = AVCaptureDeviceDiscoverySession(deviceTypes: [.builtInDualCamera], mediaType: AVMediaTypeVideo, position: .back)
for device in (devices?.devices)! {
do {
let input = try AVCaptureDeviceInput(device: device)
if (captureSession?.canAddInput(input))! {
captureSession?.addInput(input)
}
if (captureSession?.canAddOutput(sessionOutput))! {
captureSession?.addOutput(sessionOutput)
}
previewLayer = AVCaptureVideoPreviewLayer()
previewLayer?.session = captureSession
self.camerView.layer.addSublayer(previewLayer!)
self.camerView.addSubview(photoButton)
captureSession?.startRunning()
} catch {
print("error occurred")
}
}
}
@IBAction func takePhoto(_ sender: UIButton) {
photoSettings = AVCapturePhotoSettings(format: [AVVideoCodecKey : AVVideoCodecJPEG])
photoSettings?.flashMode = .on
sessionOutput?.capturePhoto(with: photoSettings!, delegate: self)
}
//AVCapturePhotoCaptureDelegate Functions
func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {
print("PhotoSampleBuffer")
}
}
我想在didFinisheProcessingPhotoSampleBuffer方法中做的只是print(),所以我知道它正被调用.我将弄清楚如何保存以后(除非有人能指出我很好的资源来学习这个.)
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最佳答案 由于sessionOutput变量为nil,因此未调用capturePhoto方法(以及委托回调).
要解决此问题,请在声明sessionOutput变量时将其实例化:
var sessionOutput = AVCapturePhotoOutput()
另外,你需要删除? sessionOutput之后,因为它不再是可选的.
sessionOutput.capturePhoto(with: photoSettings!, delegate: self)