Ios Swift-UIImagePickerController-如何使用它？

我正在努力理解它是如何工作的，但这对我来说相当困难 我有一个视图，有一个按钮和一个用于预览的小ImageView区域。 该按钮触发imagepickercontroller，UIView将显示拾取的图像。 没有错误，但图像未显示在UIImageView区域中

var imagePicker = UIImagePickerController()
@IBOutlet var imagePreview : UIImageView

@IBAction func AddImageButton(sender : AnyObject) {
    imagePicker.modalPresentationStyle = UIModalPresentationStyle.CurrentContext
    imagePicker.delegate = self
    self.presentModalViewController(imagePicker, animated: true)

}
func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info:NSDictionary!) {
    var tempImage:UIImage = info[UIImagePickerControllerOriginalImage] as UIImage
    imagePreview.image  = tempImage

    self.dismissModalViewControllerAnimated(true)

}

func imagePickerControllerDidCancel(picker: UIImagePickerController!) {

    self.dismissModalViewControllerAnimated(true)
}

---

您正在捕获名为

UIImagePickerControllerOriginalImage

的

UIImage

，但不存在此类图像。您需要从

编辑信息

字典中用键

UIImagePickerController原始图像

抓取

UIImage

：

let tempImage = editingInfo[UIImagePickerControllerOriginalImage] as! UIImage

试试这个：

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info:NSDictionary!) {
    let tempImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    imagePreview.image  = tempImage

或者您也可以使用

？

代替

详细信息

代码11.4.1（11E503a），Swift 5.2

更多

解决方案
充分利用
Info.plist

图像










自swift 4.2和xcode 10以来，
func imagePickerController（\uPicker:UIImagePickerController，did完成了PickingMediaWithInfo:[UIImagePickerController.InfoKey:Any]）
稍作更改

在函数标题处，infoKey部分从

didFinishPickingMediaWithInfo:[字符串：任意]

didFinishPickingMediaWithInfo:[UIImagePickerController.InfoKey:Any]

要获取原始图像，您现在必须呼叫：

let image=info[UIImagePickerController.InfoKey.originalImage]作为？UIImage
或

将image=info[.originalImage]设为？UIImage

在Swift 5.2、iOS 14.2中查找其他信息键（EditeImage、imageURL等…
）

class YourViewController: UIViewController,UINavigationControllerDelegate, UIImagePickerControllerDelegate {

@IBAction func btnTapped(_ sender: Any) {
    let imagePickerController = UIImagePickerController()
    imagePickerController.allowsEditing = false
    imagePickerController.sourceType = .photoLibrary
    imagePickerController.delegate = self
    present(imagePickerController, animated: true, completion: nil)
    
}

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

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

}

您是否以编程方式创建图像预览？如果它存在于XIB或故事板中，请检查您是否已连接IBOutlet。请共享
imagePreview
？oops，一些间距错误。我更正了示例代码。我使用了故事板并连接了IBOutlet。对于一些赶时间的人：谢谢。但现在我遇到了致命错误：无法在您要我添加的行上展开可选的.none。你知道这是什么意思吗？这意味着要么
editingInfo
是
nil
（我不这么认为），要么
UIImagePickerControllerOriginalImage
在字典中不存在。您正在实现一个旧方法，您要实现的是
imagePickerController:didFinishPickingMediaWithInfo:
，而不是
imagePickerController:didFinishPickingImage:editingInfo:
。谢谢Jesper。我在按照你说的修改代码后修复了它。我更新了密码。是的，我更新了！再次感谢。我编辑了上面的代码，所以代码是有效的！我猜委托方法已更改为func imagePickerController（picker:UIImagePickerController，didFinishPickingImage:UIImage！，editingInfo:[NSObject:AnyObject]！）{func imagePickerController didFinishPickingImage editingInfo已被弃用，就像iOS 3不适用于我一样：“键入'UIImagePickerController.InfoKey'（又名'NSString'）没有成员'originalImage'”+导入“UIKit”@jonye.\ujin我刚刚测试了代码。一切都对我有效。你能给我发送更多详细信息吗？
import UIKit
import AVFoundation
import Photos

protocol ImagePickerDelegate: class {
    func imagePicker(_ imagePicker: ImagePicker, grantedAccess: Bool,
                     to sourceType: UIImagePickerController.SourceType)
    func imagePicker(_ imagePicker: ImagePicker, didSelect image: UIImage)
    func cancelButtonDidClick(on imageView: ImagePicker)
}

class ImagePicker: NSObject {

    private weak var controller: UIImagePickerController?
    weak var delegate: ImagePickerDelegate? = nil

    func dismiss() { controller?.dismiss(animated: true, completion: nil) }
    func present(parent viewController: UIViewController, sourceType: UIImagePickerController.SourceType) {
        let controller = UIImagePickerController()
        controller.delegate = self
        controller.sourceType = sourceType
        self.controller = controller
        DispatchQueue.main.async {
            viewController.present(controller, animated: true, completion: nil)
        }
    }
}

// MARK: Get access to camera or photo library

extension ImagePicker {

    private func showAlert(targetName: String, completion: ((Bool) -> Void)?) {
        DispatchQueue.main.async { [weak self] in
            guard let self = self else { return }
            let alertVC = UIAlertController(title: "Access to the \(targetName)",
                                            message: "Please provide access to your \(targetName)",
                                            preferredStyle: .alert)
            alertVC.addAction(UIAlertAction(title: "Settings", style: .default, handler: { action in
                guard   let settingsUrl = URL(string: UIApplication.openSettingsURLString),
                        UIApplication.shared.canOpenURL(settingsUrl) else { completion?(false); return }
                UIApplication.shared.open(settingsUrl, options: [:]) { [weak self] _ in
                    self?.showAlert(targetName: targetName, completion: completion)
                }
            }))
            alertVC.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { _ in completion?(false) }))
            UIApplication.shared.windows.filter { $0.isKeyWindow }.first?
                .rootViewController?.present(alertVC, animated: true, completion: nil)
        }
    }

    func cameraAsscessRequest() {
        if delegate == nil { return }
        let source = UIImagePickerController.SourceType.camera
        if AVCaptureDevice.authorizationStatus(for: .video) ==  .authorized {
            delegate?.imagePicker(self, grantedAccess: true, to: source)
        } else {
            AVCaptureDevice.requestAccess(for: .video) { [weak self] granted in
                guard let self = self else { return }
                if granted {
                    self.delegate?.imagePicker(self, grantedAccess: granted, to: source)
                } else {
                    self.showAlert(targetName: "camera") { self.delegate?.imagePicker(self, grantedAccess: $0, to: source) }
                }
            }
        }
    }

    func photoGalleryAsscessRequest() {
        PHPhotoLibrary.requestAuthorization { [weak self] result in
            guard let self = self else { return }
            let source = UIImagePickerController.SourceType.photoLibrary
            if result == .authorized {
                DispatchQueue.main.async { [weak self] in
                    guard let self = self else { return }
                    self.delegate?.imagePicker(self, grantedAccess: result == .authorized, to: source)
                }
            } else {
                self.showAlert(targetName: "photo gallery") { self.delegate?.imagePicker(self, grantedAccess: $0, to: source) }
            }
        }
    }
}

// MARK: UINavigationControllerDelegate

extension ImagePicker: UINavigationControllerDelegate { }

// MARK: UIImagePickerControllerDelegate

extension ImagePicker: UIImagePickerControllerDelegate {

    func imagePickerController(_ picker: UIImagePickerController,
                               didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let image = info[.editedImage] as? UIImage {
            delegate?.imagePicker(self, didSelect: image)
            return
        }

        if let image = info[.originalImage] as? UIImage {
            delegate?.imagePicker(self, didSelect: image)
        } else {
            print("Other source")
        }
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        delegate?.cancelButtonDidClick(on: self)
    }
}

 <key>NSPhotoLibraryUsageDescription</key>
 <string>bla-bla-bla</string>
 <key>NSCameraUsageDescription</key>
 <string>bla-bla-bla</string>

import UIKit

class ViewController: UIViewController {

    private weak var imageView: UIImageView!
    private lazy var imagePicker: ImagePicker = {
        let imagePicker = ImagePicker()
        imagePicker.delegate = self
        return imagePicker
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        navigationItem.leftBarButtonItem = UIBarButtonItem(title: "camera", style: .plain, target: self,
                                                           action: #selector(cameraButtonTapped))
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "photo", style: .plain, target: self,
                                                           action: #selector(photoButtonTapped))

        let imageView = UIImageView(frame: CGRect(x: 40, y: 80, width: 200, height: 200))
        imageView.backgroundColor = .lightGray
        view.addSubview(imageView)
        self.imageView = imageView
    }

    @objc func photoButtonTapped(_ sender: UIButton) { imagePicker.photoGalleryAsscessRequest() }
    @objc func cameraButtonTapped(_ sender: UIButton) { imagePicker.cameraAsscessRequest() }
}

// MARK: ImagePickerDelegate

extension ViewController: ImagePickerDelegate {

    func imagePicker(_ imagePicker: ImagePicker, didSelect image: UIImage) {
        imageView.image = image
        imagePicker.dismiss()
    }

    func cancelButtonDidClick(on imageView: ImagePicker) { imagePicker.dismiss() }
    func imagePicker(_ imagePicker: ImagePicker, grantedAccess: Bool,
                     to sourceType: UIImagePickerController.SourceType) {
        guard grantedAccess else { return }
        imagePicker.present(parent: self, sourceType: sourceType)
    }
}

class YourViewController: UIViewController,UINavigationControllerDelegate, UIImagePickerControllerDelegate {

@IBAction func btnTapped(_ sender: Any) {
    let imagePickerController = UIImagePickerController()
    imagePickerController.allowsEditing = false
    imagePickerController.sourceType = .photoLibrary
    imagePickerController.delegate = self
    present(imagePickerController, animated: true, completion: nil)
    
}

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

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

}