斯威夫特 |照片库打不开

Question

i 创建了一个应用程序菜单，用户可以在其中单击照片，图片显示在 alertView 中，我添加了 2 个操作 -> 一个操作是取消，另一个操作是编辑图像，应该打开图库以选择其他图像。但是，当我单击编辑按钮（已添加代码）时，它什么也不做，并且与关闭警报视图相同。 ALERTVIEW 的代码是

@objc func taxImageTApped(_snder:UITapGestureRecognizer)    {
    print("TaxImage")


    let alertView = UIAlertController(title: "Edit Tax Image", message: "", preferredStyle: UIAlertController.Style.alert)
    let image = #imageLiteral(resourceName: "backimg@3x.png")
    let uiImageAlertAction = UIAlertAction(title: "", style: .default, handler: nil)
    let scaleSze = CGSize(width: 245, height: 245/image.size.width*image.size.height)
    let reSizedImage = image//.resize(newSize: scaleSze)
    uiImageAlertAction.setValue(reSizedImage.withRenderingMode(.alwaysOriginal), forKey: "image")
    alertView.addAction(uiImageAlertAction)
    alertView.addAction(UIAlertAction(title: "Cancel", style:   UIAlertAction.Style.default, handler: nil))
    alertView.addAction(UIAlertAction(title: "Edit", style: .default) {action in

    let newImage = UIImagePickerController()
    newImage.delegate = self
    newImage.sourceType =   UIImagePickerController.SourceType.photoLibrary
    newImage.allowsEditing = false
    })
        self.present(alertView, animated: true, completion: nil)
  }
    /////////////////////below is details for tap gesture i have        applied on //the label    
    taxImageView.translatesAutoresizingMaskIntoConstraints = false
    taxImageView.textColor = tableTextColor
    taxImageView.text = "View Image"
    taxImageView.textAlignment = .left
    taxImageView.attributedText = NSAttributedString(string: "View Image", attributes:
        [.underlineStyle: NSUnderlineStyle.single.rawValue])
    editInfoView.addSubview(taxImageView)
    taxImageView.leftAnchor.constraint(equalTo: editInfoView.leftAnchor, constant: 260).isActive = true
    taxImageView.topAnchor.constraint(equalTo: editInfoView.topAnchor, constant: 740).isActive = true
    taxImageView.widthAnchor.constraint(equalToConstant: 300).isActive = true
    taxImageView.heightAnchor.constraint(equalToConstant: 20).isActive = true
    taxImageView.isUserInteractionEnabled = true
    let taxImageGesture = UITapGestureRecognizer.init(target: self, action: #selector(taxImageTApped))
    taxImageGesture.numberOfTapsRequired = 1
    taxImageGesture.isEnabled = true
    taxImageGesture.cancelsTouchesInView = false
    taxImageView.gestureRecognizerShouldBegin(taxImageGesture)
    taxImageView.addGestureRecognizer(taxImageGesture)

Answer 1

试试这个

在控制器中创建变量

let imagePickerController = UIImagePickerController()

在 viewDidLoad 中添加这个

override func viewDidLoad() {
        super.viewDidLoad()
        imagePickerController.delegate = self
        imagePickerController.allowsEditing = true
        imagePickerController.modalPresentationStyle = .popover

    }

从你想要的地方调用这个函数，或者你也可以添加为手势方法

func addActionSheet() {
    let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

    let galleryOption = UIAlertAction(title: "Choose Photo", style: .default, handler: { action in
        self.imagePickerController.sourceType = .photoLibrary
        self.present(self.imagePickerController, animated: true, completion: nil)
    })

    let cameraOption = UIAlertAction(title: "Take Photo", style: .default, handler: { action in
        self.imagePickerController.sourceType = .camera
        self.present(self.imagePickerController, animated: true, completion: nil)
    })

    let deleteOption = UIAlertAction(title: "Delete Photo", style: .default, handler: { action in
        self.imageView.image = nil
    })

    let cancelOption = UIAlertAction(title: "Cancel", style: .cancel, handler: { action in
        self.dismiss(animated: true, completion: nil)
    })

    alertController.addAction(galleryOption)
    alertController.addAction(cameraOption)
    alertController.addAction(deleteOption)
    alertController.addAction(cancelOption)
    self.present(alertController, animated: true, completion: nil)
}

添加UIImagePickerControllerDelegate或UINavigationControllerDelegate的Delegate方法获取图片

extension ControllerName: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        self.imageView.image = image
        dismiss(animated: true, completion: nil)
    }

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

Answer 2

为相机和画廊创建 NSObject 类。

import UIKit

class CameraHandler: NSObject{

//MARK:- Shared Instance
static let shared = CameraHandler()
private override init() {

}

//MARK:- Variables
var currentVC: UIViewController!

//MARK: Internal Properties
var imagePickedBlock: ((UIImage) -> Void)?

//MARK:- Open Camera
func camera() {
    if UIImagePickerController.isSourceTypeAvailable(.camera){
        UINavigationBar.appearance().barTintColor = UIColor.black
        let myPickerController = UIImagePickerController()
        myPickerController.delegate = self;
        myPickerController.sourceType = .camera
        currentVC.present(myPickerController, animated: true, completion: nil)
    }
}

//MARK:- Open Gallery
func photoLibrary() {
    if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
        UINavigationBar.appearance().barTintColor = UIColor.black
        let myPickerController = UIImagePickerController()
        myPickerController.delegate = self;
        myPickerController.sourceType = .photoLibrary
        currentVC.present(myPickerController, animated: true, completion: nil)
    }
}

//MARK:- ActionSheet For Options
func showActionSheet(vc: UIViewController) {
    currentVC = vc
    let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

    actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { (alert:UIAlertAction!) -> Void in
        self.camera()
    }))

    actionSheet.addAction(UIAlertAction(title: "Gallery", style: .default, handler: { (alert:UIAlertAction!) -> Void in
        self.photoLibrary()
    }))

    actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

    vc.present(actionSheet, animated: true, completion: nil)
    }
}

 //MARK:- UIImagePickerController Delegate Methods
extension CameraHandler: UIImagePickerControllerDelegate, UINavigationControllerDelegate{
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    UINavigationBar.appearance().barTintColor = UIColor.white
    currentVC.dismiss(animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    UINavigationBar.appearance().barTintColor = UIColor.white
    if let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
        self.imagePickedBlock?(image)
    }else{
        print("Something went wrong")
    }
    currentVC.dismiss(animated: true, completion: nil)
}
}

在您的视图控制器中使用以下代码：

在当前视图控制器中显示警报：

CameraHandler.shared.showActionSheet(vc: self)

获取选中的图片：

CameraHandler.shared.currentVC = self      
CameraHandler.shared.imagePickedBlock = {(image) in
      print(image)
    }