Question

class CameraPicker: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
weak var viewController:MyProfileVC!

 func launchCamera() {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
            let imagePicker:UIImagePickerController = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = UIImagePickerControllerSourceType.camera
            imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.front
            imagePicker.cameraCaptureMode = .photo
            imagePicker.allowsEditing = false

            self.viewController.present(imagePicker, animated: true, completion: nil)
        } }
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { 
        print("didFinishPickingMedia")
}

这是我的对象类函数，但是＆＃39; didFinishPickingMediaWithInfo＆＃39;拍照后，功能不会被调用。此外，呈现imagepicker的viewcontroller是一个不同的Swift文件

Answer 1

我遇到了同样的问题，我找到了一个解决方案，所以我发布了我的版本（我正在从照片库中拍照，但它是一样的:)）。

我遇到了内存管理问题。我已经创建了一个IBAction函数，我实例化了我的相机处理程序类（里面有委托......）。在函数结束时，变量超出范围并被解除分配。为了解决这个问题，我把它作为实例变量。

这是我的UiButton的VC代码：

class STECreateUserVC: UIViewController {

    @IBOutlet weak var imgAvatar: UIImageView!
    let cameraHandler = STECameraHandler()

    @IBAction func buttonPressed(_ sender: UIButton) {
        cameraHandler.importPictureIn(self) { [weak self] (image) in
            self?.imgAvatar.image = image
        }
    }
}

......那是我的经纪人：

class STECameraHandler: NSObject {

    let imagePickerController = UIImagePickerController()
    var completitionClosure: ((UIImage) -> Void)?

    func importPictureIn(_ viewController: UIViewController, completitionHandler:((UIImage) -> Void)?) {
        completitionClosure = completitionHandler
        imagePickerController.delegate = self
        imagePickerController.allowsEditing = true
        imagePickerController.sourceType = .photoLibrary
        imagePickerController.mediaTypes = UIImagePickerController.availableMediaTypes(for: .photoLibrary)!
        viewController.present(imagePickerController, animated: true, completion: nil)
    }
}

extension STECameraHandler: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let completitionClosure = completitionClosure, let image = info[UIImagePickerControllerEditedImage] as? UIImage {
            completitionClosure(image)
        }
        imagePickerController.dismiss(animated: true)
    }
}

我使用了一个闭包来获得更清晰的代码。

Answer 2

此：

self.viewController.present(imagePicker, animated: true, completion: nil)

应该是：

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

为什么UIImagePickerController委托给我的Object类？

2 个答案: