如何在 Swift 中从相机或照片库加载图像 [关闭]

Question

关闭。 这个问题需要更加集中。 它目前不接受答案。

---

想改善这个问题吗？ 更新问题，使其仅通过编辑这篇文章来关注一个问题。

4年前关闭。

改进这个问题

例如，您如何使用相机拍摄照片或从照片库中选择图像以便能够将其显示在 imageView 中？

对此的任何帮助将不胜感激。

Answer 1

Swift 5+ 的完整更新，包括Github Repo

首先，我们想把所有东西都组织成一个专门的类。

import MobileCoreServices
import UIKit

class CameraProvider: NSObject {

    enum PhotoLibraryTypes {
        case photoLibrary, savedPhotosAlbum
        var casted: UIImagePickerController.SourceType {
            switch self {
            case .photoLibrary: return UIImagePickerController.SourceType.photoLibrary
            case .savedPhotosAlbum: return UIImagePickerController.SourceType.savedPhotosAlbum
            }
        }
    }

    public typealias SourceType = UIImagePickerController.SourceType
    public typealias ImagePicker = UIImagePickerController
    public typealias Delegate = UINavigationControllerDelegate & UIImagePickerControllerDelegate

    private let delegate: Delegate

    init(delegate: Delegate) {
        self.delegate = delegate
    }

    // MARK: - Public

    public func getImagePicker(source: PhotoLibraryTypes,
                               canEditPhotos: Bool = true,
                               onlyImages: Bool = false) throws -> ImagePicker {

        do {
            return try getBaseController(
                source: source.casted,
                allowsEditing: canEditPhotos,
                onlyImages: onlyImages
            )
        } catch {
            throw error
        }
    }

    public func getCamera(canEditPhotos: Bool = true,
                          onlyImages: Bool = false) throws -> ImagePicker {

        do {
            let picker = try getBaseController(
                source: .camera,
                allowsEditing: canEditPhotos,
                onlyImages: onlyImages
            )

            if UIImagePickerController.isCameraDeviceAvailable(.rear) {
                picker.cameraDevice = .rear
            } else if UIImagePickerController.isCameraDeviceAvailable(.front) {
                picker.cameraDevice = .front
            } else {
                throw "No known camera type available"
            }

            picker.showsCameraControls = true
            return picker
        } catch {
            throw error
        }
    }

    // MARK: - Private

    private func getBaseController(source: SourceType,
                                   allowsEditing: Bool,
                                   onlyImages: Bool) throws -> ImagePicker {

        guard UIImagePickerController.isSourceTypeAvailable(source) else {
            throw "Requested source not available"
        }

        let picker = UIImagePickerController()
        let imageType = kUTTypeImage as String
        picker.sourceType = source
        picker.allowsEditing = allowsEditing
        picker.delegate = self.delegate

        if onlyImages,
           let mediaTypes = UIImagePickerController.availableMediaTypes(for: source),
           mediaTypes.contains(imageType){
            picker.mediaTypes = [imageType]
        }

        return picker
    }
}

extension String: LocalizedError {
    public var errorDescription: String? { return self }
}

最后，我们调用我们的CameraProvider如下。

import UIKit

class ViewController: UIViewController {
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        let provider = CameraProvider(delegate: self)

        do {
            let picker = try provider.getImagePicker(source: .photoLibrary)
            present(picker, animated: true)
        } catch {
            NSLog("Error: \(error.localizedDescription)")
        }
    }
}

extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        let image = (
            info[UIImagePickerController.InfoKey.editedImage] as? UIImage ??
            info[UIImagePickerController.InfoKey.originalImage] as? UIImage
        )
        picker.dismiss(animated: true, completion: nil)
    }
}