我目前正在构建一个相机应用程序，并希望让相机拍摄像Instagram一样的方形图像375x375并保存它。
我能够取消相机的取景器，但它没有以正确的方式拍摄照片，而且当我保存它时它会将其保存在全景中。我环顾了另一个Q＆amp; As那里，但它们似乎都不适合我的代码。
有人可以帮我解决这个问题。
import Foundation
import UIKit
import AVFoundation
class CameraViewController: UIViewController{
var captureSession = AVCaptureSession()
var frontCameraDeviceInput: AVCaptureDeviceInput?
var backCameraDeviceInput: AVCaptureDeviceInput?
var currentCamera: AVCaptureDevice?
var photoOutput: AVCapturePhotoOutput?
var cameraPreviewLayer: AVCaptureVideoPreviewLayer?
var image: UIImage?
override func viewDidLoad() {
super.viewDidLoad()
setupCaptureSession()
setupDevice()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
}
func setupCaptureSession() {
captureSession.sessionPreset = AVCaptureSession.Preset.photo
}
func setupDevice() {
let frontCamera = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .front)
let backCamera = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back)
frontCameraDeviceInput = try? AVCaptureDeviceInput(device: frontCamera!)
backCameraDeviceInput = try? AVCaptureDeviceInput(device: backCamera!)
}
func setupInputOutput() {
captureSession.addInput(backCameraDeviceInput!)
photoOutput = AVCapturePhotoOutput()
photoOutput?.isHighResolutionCaptureEnabled = true
photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format:[AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
captureSession.addOutput(photoOutput!)
}
func setupPreviewLayer() {
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewLayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewLayer?.frame = self.view.frame
self.view.layer.insertSublayer(cameraPreviewLayer!, at: 0)
}
func startRunningCaptureSession() {
captureSession.startRunning()
}
@IBAction func camerButton(_ sender: Any) {
let settings = AVCapturePhotoSettings()
photoOutput?.capturePhoto(with: settings, delegate: self)
}
@IBAction func switchCamera(_ sender: Any) {
captureSession.beginConfiguration()
//Change camera device inputs from back to front or opposite
if captureSession.inputs.contains(frontCameraDeviceInput!) == true {
captureSession.removeInput(frontCameraDeviceInput!)
captureSession.addInput(backCameraDeviceInput!)
} else if captureSession.inputs.contains(backCameraDeviceInput!) == true {
captureSession.removeInput(backCameraDeviceInput!)
captureSession.addInput(frontCameraDeviceInput!)
}
//Commit all the configuration changes at once
captureSession.commitConfiguration();
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "previewCameraPhoto" {
let previewVC = segue.destination as! PreviewViewController
previewVC.image = self.image
}
}
}
extension CameraViewController: AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation() {
image = UIImage(data: imageData)
performSegue(withIdentifier: "previewCameraPhoto", sender: nil)
}
}
override var prefersStatusBarHidden: Bool
{
return true
}
}
答案 0 :(得分：2)
以下代码行用于捕获Image。点击捕获按钮时执行它们。在你的情况下它是
func camerButton（_ sender：Any）
所用方法的定义如下。
DispatchQueue.global(qos: .default).async {
let videoConnection = self.imageOutput.connection(with: AVMediaType.video)
let orientation: UIDeviceOrientation = UIDevice.current.orientation
switch orientation {
case .portrait:
videoConnection?.videoOrientation = .portrait
case .portraitUpsideDown:
videoConnection?.videoOrientation = .portraitUpsideDown
case .landscapeRight:
videoConnection?.videoOrientation = .landscapeLeft
case .landscapeLeft:
videoConnection?.videoOrientation = .landscapeRight
default:
videoConnection?.videoOrientation = .portrait
}
self.imageOutput.captureStillImageAsynchronously(from: videoConnection!) { buffer, _ in
self.session.stopRunning()
guard let b = buffer
else { return }
let data = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(b)
if var image = UIImage(data: data!) {
// Crop the image if the output needs to be square.
if self.configuration.onlySquareImagesFromCamera {
image = self.cropImageToSquare(image)
}
// Flip image if taken form the front camera.
if let device = self.device, device.position == .front {
image = self.flipImage(image: image)
}
DispatchQueue.main.async {
self.didCapturePhoto?(image)
}
}
}
}
此功能使用的两种方法 -
func cropImageToSquare(_ image: UIImage) -> UIImage {
let orientation: UIDeviceOrientation = UIDevice.current.orientation
var imageWidth = image.size.width
var imageHeight = image.size.height
switch orientation {
case .landscapeLeft, .landscapeRight:
// Swap width and height if orientation is landscape
imageWidth = image.size.height
imageHeight = image.size.width
default:
break
}
// The center coordinate along Y axis
let rcy = imageHeight * 0.5
let rect = CGRect(x: rcy - imageWidth * 0.5, y: 0, width: imageWidth, height: imageWidth)
let imageRef = image.cgImage?.cropping(to: rect)
return UIImage(cgImage: imageRef!, scale: 1.0, orientation: image.imageOrientation)
}
// Used when image is taken from the front camera.
func flipImage(image: UIImage!) -> UIImage! {
let imageSize: CGSize = image.size
UIGraphicsBeginImageContextWithOptions(imageSize, true, 1.0)
let ctx = UIGraphicsGetCurrentContext()!
ctx.rotate(by: CGFloat(Double.pi/2.0))
ctx.translateBy(x: 0, y: -imageSize.width)
ctx.scaleBy(x: imageSize.height/imageSize.width, y: imageSize.width/imageSize.height)
ctx.draw(image.cgImage!, in: CGRect(x: 0.0,
y: 0.0,
width: imageSize.width,
height: imageSize.height))
let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return newImage
}
我不应忘记赞扬这个图书馆的开发者 - https://github.com/Yummypets/YPImagePicker/blob/2.5.1/Source/Camera/YPCameraVC.swift
答案 1 :(得分：0)
只需将其添加到图像选择器中，用户就可以选择其首选裁剪比例。默认将是你想要的..一个方形照片
self.ImagePicker.allowsEditing = true