ios – 如何使用接近传感器拍摄照片？

当接近传感器启用时,我无法使用后视摄像机使设备拍摄图像.我不想让相机预览显示出来,只是想让设备拍摄照片并将其显示在imageView中.我有接近传感器工作,我使用imagePicker.takePicture()在接近传感器启用时拍摄图像,但似乎不起作用.我可以使用哪种方法/函数以编程方式拍摄没有用户输入的图片.

这是我的代码到目前为止

class ViewController: UIViewController,UINavigationControllerDelegate,UIImagePickerControllerDelegate {
 
@IBOutlet var imageView: UIImageView!
 
var imagePicker: UIImagePickerController!
 
//*The function in question*  
func proximityChanged(notification: NSNotification) {
    let device = notification.object as? UIDevice
    if device?.proximityState == true {
        print("\(device) detected!")

解决方法

如果你有麻烦用UIImagePickerController捕获照片,我建议使用AVFoundation.

以下是一个工作示例.照片捕获由接近传感器触发.

您可以添加一个预览,如果你需要它.

import UIKit
import AVFoundation
 
final class CaptureViewController: UIViewController {
 
    @IBOutlet weak var imageView: UIImageView!
 
    private static let captureSessionPreset = AVCaptureSessionPresetPhoto
    private var captureSession: AVCaptureSession!
    private var photoOutput: AVCaptureStillImageOutput!
    private var initialized = false
 
    override func viewDidLoad() {
        super.viewDidLoad()
        initialized = setupCaptureSession()
    }
 
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        if initialized {
            captureSession.startRunning()
            UIDevice.currentDevice().proximityMonitoringEnabled = true
            NSNotificationCenter.defaultCenter().addObserver(self,selector: #selector(proximityStateDidChange),name: UIDeviceProximityStateDidChangeNotification,object: nil)
        }
    }
 
    override func viewDidDisappear(animated: Bool) {
        super.viewDidDisappear(animated)
        if initialized {
            NSNotificationCenter.defaultCenter().removeObserver(self,object: nil)
            UIDevice.currentDevice().proximityMonitoringEnabled = false
            captureSession.stopRunning()
        }
    }
 
    dynamic func proximityStateDidChange(notification: NSNotification) {
        if UIDevice.currentDevice().proximityState {
            captureImage()
        }
    }
 
    // MARK: - Capture Image
 
    private func captureImage() {
        if let c = findConnection() {
            photoOutput.captureStillImageAsynchronouslyFromConnection(c) { sampleBuffer,error in
                if let jpeg  = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer),let image = UIImage(data: jpeg)
                {
                    dispatch_async(dispatch_get_main_queue()) { [weak self] in
                        self?.imageView.image = image
                    }
                }
            }
        }
    }
 
    private func findConnection() -> AVCaptureConnection? {
        for c in photoOutput.connections {
            let c = c as? AVCaptureConnection
            for p in c?.inputPorts ?? [] {
                if p.mediaType == AVMediaTypeVideo {
                    return c
                }
            }
        }
        return nil
    }
 
    // MARK: - Setup Capture Session
 
    private func setupCaptureSession() -> Bool {
        captureSession = AVCaptureSession()
        if  captureSession.canSetSessionPreset(CaptureViewController.captureSessionPreset) {
            captureSession.sessionPreset = CaptureViewController.captureSessionPreset
            if setupCaptureSessionInput() && setupCaptureSessionOutput() {
                return true
            }
        }
        return false
    }
 
    private func setupCaptureSessionInput() -> Bool {
        if let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo),let captureDeviceInput = try? AVCaptureDeviceInput.init(device: captureDevice)
        {
            if  captureSession.canAddInput(captureDeviceInput) {
                captureSession.addInput(captureDeviceInput)
                return true
            }
        }
        return false
    }
 
    private func setupCaptureSessionOutput() -> Bool {
        photoOutput = AVCaptureStillImageOutput()
        photoOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
        if  captureSession.canAddOutput(photoOutput) {
            captureSession.addOutput(photoOutput)
            return true
        }
        return false
    }
 
}

ios – 如何使用接近传感器拍摄照片？

解决方法

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