Ios Swift 3-自定义相机视图-单击按钮后显示照片的静止图像

我使用的是Swift 3，Xcode 8.2

我有一个自定义的摄像头视图，显示视频馈送和一个按钮，我想作为一个快门。当用户点击按钮时，我希望拍摄一张照片并显示在屏幕上。（例如，像Snapchat或Facebook Messenger风格的摄像头行为）

这是我的密码：

import UIKit
import AVFoundation

class CameraVC: UIViewController, AVCapturePhotoCaptureDelegate {

   // this is where the camera feed from the phone is going to be displayed
    @IBOutlet var cameraView : UIView!

    var shutterButton : UIButton = UIButton.init(type: .custom)

    // manages capture activity and coordinates the flow of data from input devices to capture outputs.
    var capture_session = AVCaptureSession()

    // a capture output for use in workflows related to still photography.
    var session_output = AVCapturePhotoOutput()

    // preview layer that we will have on our view so users can see the photo we took
    var preview_layer = AVCaptureVideoPreviewLayer()

    // still picture image is what we show as the picture taken, frozen on the screen
    var still_picture_image : UIImage!

    ... //more code in viewWillAppear that sets up the camera feed

    // called when the shutter button is pressed
    func shutterButtonPressed() {

        // get the actual video feed and take a photo from that feed
        session_output.capturePhoto(with: AVCapturePhotoSettings.init(format: [AVVideoCodecKey : AVVideoCodecJPEG]), delegate: self as AVCapturePhotoCaptureDelegate)
    }

    func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {

        // take the session output, get the buffer, and create an image from that buffer
        if let sampleBuffer = photoSampleBuffer,
            let previewBuffer = previewPhotoSampleBuffer,
            let imageData = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {

            print("Here") // doesn't get here

        }

    }

        if let error = error {
            print(error.localizedDescription)
        }

运行此代码时，它似乎没有打印“Here”，我也找不到任何有关如何显示此图像的Swift 3教程。我猜我想把

图像数据

分配给我的

静止图像

并以某种方式覆盖在相机馈送上

在正确的方向上的任何帮助或一点都将是巨大的帮助

编辑

将以下内容添加到我的代码后：

import UIKit
import AVFoundation

class CameraVC: UIViewController, AVCapturePhotoCaptureDelegate {

   // this is where the camera feed from the phone is going to be displayed
    @IBOutlet var cameraView : UIView!

    var shutterButton : UIButton = UIButton.init(type: .custom)

    // manages capture activity and coordinates the flow of data from input devices to capture outputs.
    var capture_session = AVCaptureSession()

    // a capture output for use in workflows related to still photography.
    var session_output = AVCapturePhotoOutput()

    // preview layer that we will have on our view so users can see the photo we took
    var preview_layer = AVCaptureVideoPreviewLayer()

    // still picture image is what we show as the picture taken, frozen on the screen
    var still_picture_image : UIImage!

    ... //more code in viewWillAppear that sets up the camera feed

    // called when the shutter button is pressed
    func shutterButtonPressed() {

        // get the actual video feed and take a photo from that feed
        session_output.capturePhoto(with: AVCapturePhotoSettings.init(format: [AVVideoCodecKey : AVVideoCodecJPEG]), delegate: self as AVCapturePhotoCaptureDelegate)
    }

    func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {

        // take the session output, get the buffer, and create an image from that buffer
        if let sampleBuffer = photoSampleBuffer,
            let previewBuffer = previewPhotoSampleBuffer,
            let imageData = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {

            print("Here") // doesn't get here

        }

    }

        if let error = error {
            print(error.localizedDescription)
        }

---

但是我仍然没有打印出任何错误。

将以下代码添加到委托方法中，以打印出抛出的错误：

if let error = error {
   print(error.localizedDescription)
}

---

一旦您解决了错误，我认为这篇文章应该可以帮助您提取图像：

将以下代码添加到您的委托方法中，以打印出抛出的错误：

if let error = error {
   print(error.localizedDescription)
}

---

一旦你解决了错误，我想这篇文章应该可以帮助你提取图像：

好的，我解决了我的问题：

首先，将UIImageView拖动到情节提要，并使其占据整个屏幕。这是按下快门按钮后显示静态图片的位置

在代码中创建该变量并将其链接

@IBOutlet weak var stillPicture : UIImageView!

然后，在

viewdiload

中，确保将

UIImageView

插入相机视图顶部

self.view.insertSubview(stillPicture, aboveSubview: your_camera_view)

这是单击快门按钮时调用的函数：

func shutterButtonPressed() {

    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
    session_output.capturePhoto(with: settings, delegate: self)
}

然后，在捕获代理中：

func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {
        if let error = error {
            print(error.localizedDescription)
        }

        // take the session output, get the buffer, and create an image from that buffer
        if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
            // this is the image that the user has taken!
            let takenImage : UIImage = UIImage(data: dataImage)!
            stillPicture?.image = takenImage                
        } else {
            print("Error setting up photo capture")
        }
}

---

好吧，我解决了我的问题：

首先，将UIImageView拖动到情节提要，并使其占据整个屏幕。这是按下快门按钮后显示静态图片的位置

在代码中创建该变量并将其链接

@IBOutlet weak var stillPicture : UIImageView!

然后，在

viewdiload

中，确保将

UIImageView

插入相机视图顶部

self.view.insertSubview(stillPicture, aboveSubview: your_camera_view)

这是单击快门按钮时调用的函数：

func shutterButtonPressed() {

    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
    session_output.capturePhoto(with: settings, delegate: self)
}

然后，在捕获代理中：

func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) {
        if let error = error {
            print(error.localizedDescription)
        }

        // take the session output, get the buffer, and create an image from that buffer
        if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer) {
            // this is the image that the user has taken!
            let takenImage : UIImage = UIImage(data: dataImage)!
            stillPicture?.image = takenImage                
        } else {
            print("Error setting up photo capture")
        }
}

---

您可以添加一个带有捕获图像的UIImageView，对吗？理论上是的，但是我的代码中没有打印“Here”这个词，因此它似乎没有通过

if

语句。您是否调用了

captureSession？.startRunning（）

？嘿，你能发布完整的代码吗？你可以添加一个带有捕获图像的UIImageView，对吗？理论上，是的，但是我的代码中没有打印“Here”这个词，所以它似乎没有通过

if

语句。你调用了

captureSession吗？.startRunning（）

？嘿，你能发布完整的代码吗？