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允许通过照片库和相机发布图像的应用程序。我创建了一个基本演示，其中包含一个 UIImageView、UIButton 以及一些用于设置 UIImagePickerController 的代码。此外，我还在Xcode的plist部分设置了（NSPhotoLibraryUsageDescription和NSCameraUsageDescription）。当我运行模拟器时，图像拾取功能工作得很好，我没有被询问是否应该让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ning。没有这些，应用程序应该会崩溃，但不会。我的问题是我在这里做错了什么让选择器在没有 plist 的情况下工作，为什么应用程序不请求 NS 使用语句的权限？

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.
}

}

Storyboard View

plist image

Answer 1

why does the app not ask for permissions with the NS usage statements

这是由于 iOS11 中的更改。您不再需要用户授权仅通过 UIImagePickerController 接收 UIImage。

但如果您想要更深入的信息，即访问作为 PHAsset 的图像及其元数据，您确实需要用户授权。

当然，如果您希望此应用在 iOS 10 及之前运行，您仍然需要用户授权。

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

UIImagePickerController working without NS Photo Library and Camera descriptions

uiimagepickercontroller

ios

xcode8

swift4