Question

我正在尝试为用户提供两个上传图片的选项，第一个是照片库，第二个是相机。我有一个操作表，用户可以在其中选择他要上传图像的方式，但是当单击“相机”选项时，相机应用将无法打开。我确实在plist文件中添加了所需的隐私。这是我的动作表代码：

extension MoreReportsVC: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

func handleAddPhoto() {
    showSimpleActionSheet(controller: self)
}


func showSimpleActionSheet(controller: UIViewController) {
    let alert = UIAlertController(title: "Add a photo", message: "Please Select an option", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "From photo library", style: .default, handler: { (_) in
        self.imagePicker.getImage(fromSourceType: .photoLibrary)
    }))

    alert.addAction(UIAlertAction(title: "Open camera app", style: .default, handler: { (_) in
        self.imagePicker.getImage(fromSourceType: .camera)
    }))

    alert.addAction(UIAlertAction(title: "Dismiss", style: .cancel, handler: { (_) in
        print("User click Dismiss button")
    }))

    self.present(alert, animated: true, completion: {
        print("completion block")
    })
}
}

这是我的ImagePicker代码：

class ImagePickerManager: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

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

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    //TODO:
}

func getImage(fromSourceType sourceType: UIImagePickerController.SourceType){
    if UIImagePickerController.isSourceTypeAvailable(sourceType){
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = sourceType
        self.present(imagePickerController, animated: true, completion: nil)
    }
}
}

操作表中的imagePicker只是一个ImagePickerManager变量。该应用程序不会崩溃或发生任何事情，它可以进入getImage方法，但不要打开相机。

编辑：我认为问题出在委托=自我中。自我需要是VC，如果我没记错的话，我会尝试查看图像选择器。当前是ImagePickerManager，但是我找不到将其设置为VC的方法。

Answer 1

在getImage扩展名中添加UIViewController方法，

extenstion UIViewController { 
    func getImage(fromSourceType sourceType: UIImagePickerController.SourceType){
        if UIImagePickerController.isSourceTypeAvailable(sourceType){
            let imagePickerController = UIImagePickerController()
            imagePickerController.delegate = self
            imagePickerController.sourceType = sourceType
            self.present(imagePickerController, animated: true, completion: nil)
         } else {
            print("Source type isn't available")
         }
    }
}

然后从showSimpleActionSheet的{{1}}方法调用此方法

self

Answer 2

问题是您的ImagePickerManager实际上不是对该接口中当前任何视图控制器的引用。因此，self.present不执行任何操作，因为self不是当前的视图控制器。

如果要将图像选择器管理放入不是当前视图控制器的封装类中，则封装不应本身成为视图控制器；它应该只是一个普通的对象。这样一来，您将无法说出self.present，因此您需要为该对象提供对当前视图控制器（在本例中为MoreReportsVC）的引用。

通过“动作表”选项访问相机

2 个答案: