UIImagePickerController在没有NS照片库和相机描述的情况下工作

Question

我正在使用UIImagePickerController，因为我正在创建一个应用程序，该应用程序允许通过照片库和照相机发布图像。我创建了一个基本的演示，其中包含一个UIImageView，UIButton和一些用于设置UIImagePickerController的代码。此外，我还在Xcode的plist部分中设置了（NSPhotoLibraryUsageDescription和NSCameraUsageDescription）。图像拾取功能可以很好地运行，但是当我运行模拟器时，没有询问我是否应该让该应用程序允许访问我的相机或照片库。然后，我尝试取消plist语句并再次运行。没有这些，应用程序应该崩溃，但不会崩溃。

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {


@IBOutlet weak var imageView: UIImageView!


@IBAction func importImage(_ sender: UIButton) {

    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self

    let actionSheet = UIAlertController(title: "Add Your Profile Picture", message: "Choose An Option", preferredStyle: . actionSheet)

    actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { (action:UIAlertAction) in
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            imagePickerController.sourceType = .camera
            self.present(imagePickerController, animated: true, completion: nil)
        }
        else {
            print("Camera not Available")
        }
    }))

    actionSheet.addAction(UIAlertAction(title: "Camera Roll", style: .default, handler:{ (action:UIAlertAction) in imagePickerController.sourceType = .photoLibrary
        self.present(imagePickerController, animated: true, completion: nil)
    }))

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

    self.present(actionSheet, animated: true, completion: nil)

}


func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage

    imageView.image = image

    picker.dismiss(animated: true, completion: nil)
}


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




override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

故事板视图

plist图片

Answer 1

为什么应用程序不使用NS使用说明请求权限

这是由于iOS 11中的更改​​而引起的。您不再仅需要通过UIImagePickerController接收UIImage的用户授权。

但是，如果您想获得更深的信息，即以PHAsset的形式访问图像及其元数据，则确实需要用户授权。

当然，如果您希望此应用程序在iOS 10及更高版本上运行，则仍然需要用户授权。