如何从Swift中的相机或照片库加载图像

Question

如何使用相机拍照或从照片库中选择图像以便能够在imageView中显示？

对此有任何帮助将不胜感激。

Answer 1

我在 Swift 3

中使用以下内容

//
//  DSCameraHandler.swift
//
//  Created by David Seek on 23.04.17.
//  Copyright © 2016 David Seek. All rights reserved.
//

import MobileCoreServices
import UIKit

class DSCameraHandler: NSObject {

    private let imagePicker = UIImagePickerController()
    private let isPhotoLibraryAvailable = UIImagePickerController.isSourceTypeAvailable(.photoLibrary)
    private let isSavedPhotoAlbumAvailable = UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum)
    private let isCameraAvailable = UIImagePickerController.isSourceTypeAvailable(.camera)
    private let isRearCameraAvailable = UIImagePickerController.isCameraDeviceAvailable(.rear)
    private let isFrontCameraAvailable = UIImagePickerController.isCameraDeviceAvailable(.front)
    private let sourceTypeCamera = UIImagePickerControllerSourceType.camera
    private let rearCamera = UIImagePickerControllerCameraDevice.rear
    private let frontCamera = UIImagePickerControllerCameraDevice.front

    var delegate: UINavigationControllerDelegate & UIImagePickerControllerDelegate
    init(delegate_: UINavigationControllerDelegate & UIImagePickerControllerDelegate) {
        delegate = delegate_
    }

    func getPhotoLibraryOn(_ onVC: UIViewController, canEdit: Bool) {

        if !isPhotoLibraryAvailable && !isSavedPhotoAlbumAvailable { return }
        let type = kUTTypeImage as String

        if isPhotoLibraryAvailable {
            imagePicker.sourceType = .photoLibrary
            if let availableTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary) {
                if availableTypes.contains(type) {
                    imagePicker.mediaTypes = [type]
                    imagePicker.allowsEditing = canEdit
                }
            }

            imagePicker.sourceType = .savedPhotosAlbum
            if let availableTypes = UIImagePickerController.availableMediaTypes(for: .savedPhotosAlbum) {
                if availableTypes.contains(type) {
                    imagePicker.mediaTypes = [type]
                }
            }
        } else {
            return
        }

        imagePicker.allowsEditing = canEdit
        imagePicker.delegate = delegate
        onVC.present(imagePicker, animated: true, completion: nil)
    }

    func getCameraOn(_ onVC: UIViewController, canEdit: Bool) {

        if !isCameraAvailable { return }
        let type1 = kUTTypeImage as String

        if isCameraAvailable {
            if let availableTypes = UIImagePickerController.availableMediaTypes(for: .camera) {
                if availableTypes.contains(type1) {
                    imagePicker.mediaTypes = [type1]
                    imagePicker.sourceType = sourceTypeCamera
                }
            }

            if isRearCameraAvailable {
                imagePicker.cameraDevice = rearCamera
            } else if isFrontCameraAvailable {
                imagePicker.cameraDevice = frontCamera
            }
        } else {
            return
        }

        imagePicker.allowsEditing = canEdit
        imagePicker.showsCameraControls = true
        imagePicker.delegate = delegate
        onVC.present(imagePicker, animated: true, completion: nil)
    }
}

通过以下方式在您想要的ViewController中调用：

extension ViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {

    func thisIsTheFunctionWeAreCalling() {
        let camera = DSCameraHandler(delegate_: self)
        let optionMenu = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        optionMenu.popoverPresentationController?.sourceView = self.view

        let takePhoto = UIAlertAction(title: "Take Photo", style: .default) { (alert : UIAlertAction!) in
            camera.getCameraOn(self, canEdit: true)
        }
        let sharePhoto = UIAlertAction(title: "Photo Library", style: .default) { (alert : UIAlertAction!) in
            camera.getPhotoLibraryOn(self, canEdit: true)
        }
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (alert : UIAlertAction!) in
        }
        optionMenu.addAction(takePhoto)
        optionMenu.addAction(sharePhoto)
        optionMenu.addAction(cancelAction)
        self.present(optionMenu, animated: true, completion: nil)
    }

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        let image = info[UIImagePickerControllerEditedImage] as! UIImage

        // image is our desired image

        picker.dismiss(animated: true, completion: nil)
    }
}