图像选择器/UIImagePickerController 显示空白屏幕/NavigationController swift 5

Question

我试图从这个问题答案链接中得到答案但失败了:(

iOS UIImagePickerController showed blank page

然后我尝试下面的代码，但仍然显示没有图像列表的空白屏幕:( 我认为不要触发委托功能 您也可以从 GitHub 上查看

https://github.com/MdAshfaqurRahmanIOS/image-picker-3

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    var imagePicker = UIImagePickerController()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        imagePicker.delegate = self
    }
    @IBAction func buttonAction(_ sender: UIButton) {
        imagePicker.sourceType = .photoLibrary
        imagePicker.allowsEditing = true
        present(imagePicker, animated: true)
    }
}
extension ViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let image = info[UIImagePickerController.InfoKey(rawValue: "UIImagePickerControllerEditedImage")] as? UIImage {
            imageView.image = image
        }
        picker.dismiss(animated: true, completion: nil)
    }
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true, completion: nil)
    }
}

添加此 info.plist
关键 =>>>> 隐私 - 照片库使用 value =>> 请访问图片库

控制台日志

• 2020-12-17 22:49:11.928762+0600 image-picker-3[1309:51223] [生命周期] [u B37332A2-92E0-4D65-981B-0DBBDB4534D9:m (null)] [com.apple.mobileslideshow.photo-picker(1.0)] 连接插件 使用时中断。 2020-12-17 22:49:11.944027+0600 image-picker-3 [1309:51223] [生命周期] [u B37332A2-92E0-4D65-981B-0DBBDB4534D9:m（空）] [com.apple.mobileslideshow.photo-picker(1.0)] 连接插件 使用时失效。 2020-12-17 22:49:12.003410+0600 image-picker-3 [1309:51015] UIImagePickerController UIViewController 创建错误：Error Domain=NSCocoaErrorDomain Code=4099 "The 连接到名为 pid 0 的服务 com.apple.mobileslideshow.photo-picker.viewservice 被中断， 但是消息是通过一个额外的代理发送的，因此这个 代理已失效。" UserInfo={NSDebugDescription=The 连接到名为 pid 0 的服务 com.apple.mobileslideshow.photo-picker.viewservice 被中断， 但是消息是通过一个额外的代理发送的，因此这个 代理已失效。}

Answer 1

尝试按照下面我的编程示例，首先将您的按钮和委托添加到您的控制器并导入照片框架：

import UIKit
import Photos

class YourViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

lazy var takePicButton: UIButton = {
    let button = UIButton()
    button.backgroundColor = .red
    button.setTitle("Present img picker", for: .normal)
    button.setTitleColor(.white, for: .normal)
    button.titleLabel?.font = .systemFont(ofSize: 16, weight: .semibold)
    button.layer.cornerRadius = 14
    button.clipsToBounds = true
    button.addTarget(self, action: #selector(handlepickPicture), for: .touchUpInside)
    button.translatesAutoresizingMaskIntoConstraints = false
    
    return button
}()

现在在 viewDidLoad 添加按钮并设置约束：

override func viewDidLoad() {
    super.viewDidLoad()
    
    view.addSubview(takePicButton)
    takePicButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20).isActive = true
    takePicButton.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 20).isActive = true
    takePicButton.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -20).isActive = true
    takePicButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
}

然后将你的 func 设置为显示图像选择器控制器：

var imagePicker = UIImagePickerController()

@objc fileprivate func handlepickPicture() {
    
    imagePicker.delegate = self
    imagePicker.sourceType = .photoLibrary
    imagePicker.view.tintColor = .white
    imagePicker.mediaTypes = ["public.image"]
    imagePicker.allowsEditing = true
    imagePicker.navigationBar.barTintColor = .black
    
    checkPermission()
}

检查权限，别忘了设置你的info.plist隐私使用说明（和你一样）：

fileprivate func checkPermission() {
    let photoAuthorizationStatus = PHPhotoLibrary.authorizationStatus()
    switch photoAuthorizationStatus {
    case .authorized:
        print("Add Photo")
        if UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum){
            print("Access is granted by user")
            self.present(imagePicker, animated: true, completion: nil)
        }
        print("Access is granted by user")
    case .notDetermined:
        PHPhotoLibrary.requestAuthorization({
            (newStatus) in
            print("status is \(newStatus)")
            if newStatus ==  PHAuthorizationStatus.authorized {
                /* do stuff here */
                DispatchQueue.main.async {
                    self.present(self.imagePicker, animated: true, completion: nil)
                }
                print("success")
            }
        })
        print("It is not determined until now")
    case .restricted:
        // same same
        print("User do not have access to photo album.")
        goToSetting()
    case .denied:
        // same same
        print("Text tapped...")
        goToSetting()
        print("User has denied the permission.")
    case .limited:
        goToSetting() // the function show an alert to enable Authorization manually
        print("User has denied the permission.")
    @unknown default:
        fatalError()
    }
}

编写手动设置授权的函数：

fileprivate func goToSetting() {
    let title = "Oooooops!"
    let message = "Hi man, for use this App press Go To settings and enabled access to Pohto Gallery... Check read and write option and relaunch the App!"
    
    let alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)
    
    let subview = (alertController.view.subviews.first?.subviews.first?.subviews.first!)! as UIView
    subview.backgroundColor = UIColor(white: 0, alpha: 0.2)
    
    alertController.setValue(NSAttributedString(string: title, attributes: [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 18, weight: .heavy),NSAttributedString.Key.foregroundColor : UIColor.red]), forKey: "attributedTitle")
    alertController.setValue(NSAttributedString(string: message, attributes: [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 14, weight: .regular),NSAttributedString.Key.foregroundColor : UIColor.white]), forKey: "attributedMessage")
    
    let cancelAction = UIAlertAction(title: "Cancel", style: .destructive) { (_) in
        print("Action cancelled")
    }
    
    let goToSettingPermission = UIAlertAction(title: "Go To setting", style: .default) { (action) in
        UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!, options: [:], completionHandler: nil)
    }
    
    alertController.addAction(goToSettingPermission)
    alertController.addAction(cancelAction)
    
    self.present(alertController, animated: true, completion: {
    })
}

这是结果，在 dx 上手动授权的警报，在选择器控制器的左侧

如果您没有看到预览照片，请尝试使用其他模拟器设备运行应用程序。

Answer 2

您可以通过将这些照片放入一个 collectionView 中来使用它，就像这样“我使用 RxSwift 制作的：

import UIKit
import RxSwift
import Foundation
import Photos

private let reuseIdentifier = "ImageCell"

class ImagesCollectionViewController: UICollectionViewController {
    
//MARK: - vars
private var images = [PHAsset]()
private var selectedPhotoSubject = PublishSubject<UIImage>()
var selectedPhoto: Observable<UIImage> {
    return selectedPhotoSubject.asObservable()
}

//MARK: - LifeCycle
override func viewDidLoad() {
    super.viewDidLoad()
    linkPhotosLibrary()
    self.title = "Pick an Image"
    
}
//MARK: - PhotoLibrary
private func linkPhotosLibrary() {
    PHPhotoLibrary.requestAuthorization { [weak self] status in
        if status == .authorized {
            
            let assets = PHAsset.fetchAssets(with: PHAssetMediaType.image,options: nil)
            assets.enumerateObjects { (object, count, stop) in
                self?.images.append(object)
            }
            self?.images.reverse()
            DispatchQueue.main.async {
            self?.collectionView.reloadData()
            }
        }
        
    }
}

// MARK: - UICollectionViewDataSource

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return images.count
}

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! ImageCell
    
    let asset = images[indexPath.row]
    let manager = PHImageManager.default()
    
    manager.requestImage(for: asset, targetSize: CGSize(width: 200,height: 200), contentMode: .aspectFit, options: nil) { image, _ in
        
        DispatchQueue.main.async {
            cell.imageViewOutlet.image = image
        }
    }
    
    return cell
}

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    
    let selectedAsset = images[indexPath.row]
    PHImageManager.default().requestImage(for: selectedAsset, targetSize: CGSize(width: 500, height: 500), contentMode: .aspectFit, options: nil) { [weak self] image , info in
        guard let info = info else {return}
        let isDegradedImage = info["PHImageResultIsDegradedKey"] as! Bool
        // as we will call this function 2 times one for the small image in the collection and one here that's why we use it as this will tell us if the image is thumbnail or original image
        if !isDegradedImage {
            
            if let image = image {
                self?.selectedPhotoSubject.onNext(image)
                self?.dismiss(animated: true, completion: nil)
            }
        }
        
    }
}

}

也可以正常使用：

    var myGallery: GalleryController!

    func showGalleryImages () {
        
        self.myGallery = GalleryController()
        self.myGallery.delegate = self
        Config.tabsToShow = [.imageTab, .cameraTab]
        Config.Camera.imageLimit = 100
        
        self.present(self.myGallery, animated: true, completion: nil)
        
    }
    
}