ios共享扩展摄像头答案

【问题标题】：ios share extension cameraios共享扩展摄像头
【发布时间】：2015-10-30 03:36:36
【问题描述】：

我正在尝试在共享扩展上使用相机拍摄图像。有可能吗？目前，在我的主应用程序中，我是这样写的。

self.pickerController = [[UIImagePickerController alloc] init];
[self.pickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
[self.pickerController setDelegate:self.delegate];
self.pickerController.showsCameraControls = NO;

//In main VC, I write like this 
[self presentViewController:[ImageTakingHelper sharedInstance].pickerController animated:YES completion:nil];

在我的主应用程序中没问题，但在我的共享扩展程序中，它显示黑屏以供相机查看。我该怎么办？

【问题讨论】：

标签： ios ios8-share-extension

【解决方案1】：

你做不到。请记住，您的共享扩展程序正在其他人的应用程序中运行。它在那里只能做一小部分事情，使用相机不是其中之一。（即使您可以这样做，他们的应用也可能没有使用相机的权限。）此外，您的共享扩展程序不拥有屏幕，因此它无法显示图像选择器。

可以在此处找到有关此限制的 Apple 文档： https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/ExtensionOverview.html

【讨论】：

虽然此答案的相机访问方面是正确的，但可以在其他应用程序的上下文中使用 UIImagePickerController 访问照片。当我在 iOS 11 上进行测试时，它会在扩展应用程序的上下文中显示图像选择器并显示安全警报。所以看起来权限是从扩展的父级继承的。这甚至在没有照片访问权限的应用中展示共享扩展时也有效。
@meagar 点，没问题。

【解决方案2】：

import UIKit

class SSImagePicker: NSObject {

    static let shared = SSImagePicker()
    fileprivate var thisVC: UIViewController!
    var imagePickedBlock: ((UIImage) -> Void)?

    //MARK: Used to Open Camera/Library
    private func openCamera(){
        if UIImagePickerController.isSourceTypeAvailable(.camera){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.sourceType = .camera
            myPickerController.allowsEditing = false
            thisVC.present(myPickerController, animated: true, completion: nil)
        }
    }

    private func openGallery(){
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.sourceType = .photoLibrary
            myPickerController.allowsEditing = true
            thisVC.present(myPickerController, animated: true, completion: nil)
        }
    }


    func ssActionSheetFor(viewRect : UIButton?,controller: UIViewController,with imagePickerTypes : [SSImagePickerType]) {
        guard viewRect != nil else {
            return
        }
        thisVC = controller
        let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

        for objImagePickerType in imagePickerTypes {
            let objAction = UIAlertAction(title: objImagePickerType.rawValue, style: .default, handler: { (alert:UIAlertAction!) -> Void in

                switch  alert.title {
                case SSImagePickerType.ssCamera.rawValue:
                    self.openCamera()
                case SSImagePickerType.ssGalery.rawValue:
                    self.openGallery()
                default:
                    self.openGallery()
                }
            })
            actionSheet.addAction(objAction)
        }
        actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
        if let presenter = actionSheet.popoverPresentationController {
            presenter.sourceView = viewRect;
            presenter.sourceRect = viewRect!.bounds
            presenter.permittedArrowDirections = UIPopoverArrowDirection.up;
        }
        thisVC.present(actionSheet, animated: true, completion: nil)
    }


}

extension SSImagePicker: UIImagePickerControllerDelegate, UINavigationControllerDelegate{

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

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let image = info[.editedImage] as? UIImage {
            self.imagePickedBlock?(image)
        }else{
            if let image = info[.originalImage] as? UIImage {
                 self.imagePickedBlock?(image)
            }else{
                alertMessase(message: "Something went wrong", okAction: {})
            }
        }
        thisVC.dismiss(animated: true, completion: nil)
    }
}

enum SSImagePickerType : String {
    case ssCamera = "Camera"
    case ssGalery = "Gallery"
    case ssVideo = "Videos"
    init(){
        self = .ssGalery
    }
}

//MARK:- 你可以这样使用

SSImagePicker.shared.ssActionSheetFor(viewRect: sender, controller: self, with: [.ssCamera,.ssGalery])
    SSImagePicker.shared.imagePickedBlock = { (selectedImage) in
        self.imgProfile?.image = selectedImage
    }

【讨论】：