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
}
}