访问和使用IOS摄像头

我正在努力学习如何在IOS设备上访问和使用摄像头，事实上我找不到那么多关于它的信息，至少不是最新的，或者对初学者来说很有用

不管怎样，我已经尝试了下面的代码，但是当我点击按钮打开相机时什么都没有发生，它只是冻结了，什么也不做，我是错过了什么还是做错了什么

import UIKit
import MobileCoreServices

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var myImg: UIImageView!
    var newMedia: Bool!

    @IBAction func cameraRoll(_ sender: Any) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.savedPhotosAlbum){
            let imagePicker = UIImagePickerController()

            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.mediaTypes = [kUTTypeImage as String]
            imagePicker.allowsEditing = false
            self.present(imagePicker, animated: true, completion: nil)
            newMedia = false
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let mediaType = info[UIImagePickerControllerMediaType] as! NSString

        self.dismiss(animated: true, completion: nil)

        if mediaType.isEqual(to: kUTTypeImage as String){
            let image = info[UIImagePickerControllerOriginalImage] as! UIImage

            myImg.image = image

            if (newMedia == true) {
                UIImageWriteToSavedPhotosAlbum(image, self, #selector(ViewController.image(image:didFinishsavingWithError:contextInfo:)), nil)

            } else if mediaType.isEqual(to: kUTTypeMovie as String){
                //vid support
            }
        }
    }

    func image(image: UIImage, didFinishsavingWithError error: NSErrorPointer, contextInfo:UnsafeRawPointer){
        if error != nil {
            let alert = UIAlertController(title: "Save Failed", message: "Failed to save image", preferredStyle: UIAlertControllerStyle.alert)

            let cancelAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
            alert.addAction(cancelAction)
            self.present(alert, animated: true, completion: nil)
        }
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.dismiss(animated: true, completion: nil)
    }

    @IBAction func takePhoto(_ sender: Any) {

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera){

            let imagePicker = UIImagePickerController()

            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.mediaTypes = [kUTTypeImage as String]
            imagePicker.allowsEditing = false
            self.present(imagePicker, animated: true, completion:  nil)
            newMedia = false
        }     
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
}

---

在您的

拍照

方法中，我假设您希望使用该方法访问您的相机，您正在将imagePicker源设置为

.photoLibrary

。您是否通过添加

NSCameraUsageDescription

和

NSPhotoLibraryUsageDescription

密钥以及对每种密钥的解释来实现安全协议？如果不是，它可能会导致崩溃。这就是我所做的，我正在遵循一个教程。您正在检查源类型camera是否可用，然后在下面的代码中，您将sourceType设置为photoLibrary，将其更改为UIImagePickerControllerSourceType.camera。还有一件事，请在“设置”中检查应用程序的摄像头权限。您是在模拟器上还是在实际设备上进行尝试？因为功能相关的摄像头在模拟器上无法工作。可能重复