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在单个用户单击相机预览后，我尝试拍摄几张照片，以便我可以展示它们，并且用户可以选择时间最佳的照片或以“胶片”模式使用所有照片。预期的用户体验是：“我打开相机，拍照，然后我看到 5 张照片一秒一秒地拍摄。我不必按 5 次‘拍照’按钮，一张就足以启动序列” .

我是 iOS 和 Swift 的新手，我的工作基于“Swift 食谱”一书 ( https://www.safaribooksonline.com/library/view/ios-8-swift/9781491908969/ )。

拍摄单张照片的源代码是：

controller = UIImagePickerController()
    if let theController = controller{
        theController.sourceType = .Camera
        theController.mediaTypes = [kUTTypeImage as NSString]
        theController.allowsEditing = true
        theController.delegate = self
        presentViewController(theController, animated: true, completion: nil)
    }

加上相关的图像处理（通过 func imagePickerController）。我尝试使用上面的控制器对象，但失败了:(我相信这不是获得我想要的东西的正确方法，但我很难找到合适的方法。任何帮助将不胜感激。

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1 回答 1

5

我不知道在UIImagePickerController. 如果我是你，我会使用AVFoundation来实现它。

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var connection: AVCaptureConnection!
    var output: AVCaptureStillImageOutput!
    var videoPreviewLayer: AVCaptureVideoPreviewLayer!
    @IBOutlet var videPreviewView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.createCamera()
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        self.videoPreviewLayer.bounds = self.videPreviewView.bounds
        self.videoPreviewLayer.position = CGPoint(x: CGRectGetMidX(self.videPreviewView.bounds), y: CGRectGetMidY(self.videPreviewView.bounds))
    }

    func createCamera() {
        let captureSession = AVCaptureSession()

        if captureSession.canSetSessionPreset(AVCaptureSessionPresetHigh) {
            captureSession.sessionPreset = AVCaptureSessionPresetHigh
        } else {
            println("Error: Couldn't set preset = \(AVCaptureSessionPresetHigh)")
            return
        }

        let cameraDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)

        var error: NSError?
        let inputDevice = AVCaptureDeviceInput.deviceInputWithDevice(cameraDevice, error: &error) as AVCaptureDeviceInput
        if let error = error {
            println("Error: \(error)")
            return
        }

        if captureSession.canAddInput(inputDevice) {
            captureSession.addInput(inputDevice)
        } else {
            println("Error: Couldn't add input device")
            return
        }

        let imageOutput = AVCaptureStillImageOutput()
        if captureSession.canAddOutput(imageOutput) {
            captureSession.addOutput(imageOutput)
        } else {
            println("Error: Couldn't add output")
            return
        }

        // Store imageOutput. We will need it to take photo
        self.output = imageOutput

        let connection = imageOutput.connections.first as AVCaptureConnection!
        // Store this connection in property. We will need it when we take image.
        self.connection = connection
        connection.videoOrientation = AVCaptureVideoOrientation.Portrait

        captureSession.startRunning()

        // This will preview the camera
        let videoLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        videoLayer.contentsScale = UIScreen.mainScreen().scale

        self.videPreviewView.layer.addSublayer(videoLayer)

        // Store this layer instance in property. We will place it into a view
        self.videoPreviewLayer = videoLayer
    }

    func takePhoto(completion: (UIImage?, NSError?) -> Void) {
        self.output.captureStillImageAsynchronouslyFromConnection(self.connection) { buffer, error in
            if let error = error {
                completion(nil, error)
            } else {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer)
                let image = UIImage(data: imageData, scale: UIScreen.mainScreen().scale)
                completion(image, nil)
            }
        }
    }
}

现在您所要做的就是创建一个调用takePhoto3 次的动作。您可以使用它NSTimer来执行此操作。

于 2014-10-30T00:01:51.363 回答