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。我创建了一个基本的演示，它包含一个UIImageView，UIButton和一些代码来设置UIImagePickerController。另外，我还在Xcode的plist部分设置了（NSPhotoLibraryUsageDescription和NSCameraUsageDescription）。图像拾取功能工作得很漂亮但是当我运行模拟器时，我不会被问到我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。没有这些，应用程序应该崩溃，但它不会。我的问题是我在这里做错了，让选择器在没有plist的情况下工作，为什么应用程序不要求NS用法语句的权限？

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

为什么应用程序不要求NS使用声明的权限

这是由于iOS 11的变化。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，即以PHAsset及其元数据访问图像，您做需要用户授权。

当然，如果您希望此应用在iOS 10及之前运行，您仍需要用户授权。

UIImagePickerController在没有NS Photo Library和Camera描述的情况下工作

1 个答案: