爲什麼不把UIImagePickerController委託給我的Object類？

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") 
}

這是我的對象類函數，但'didFinishPickingMediaWithInfo'函數在拍攝照片後不會被調用。此外，這是呈現imagepicker的視圖 - 控制是一個不同的斯威夫特文件爲什麼不把UIImagePickerController委託給我的Object類？

來源

2016-12-17 Dee

你在模擬器或手機上試過這個嗎？它不會在模擬器上工作，因爲模擬器沒有相機 –

我在我的手機上試過這個 – Dee

@Dee你在info.plist中添加了'NSPhotoLibraryUsageDescription' ？ –

-1

此：

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

應該是：

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

來源

2016-12-17 06:17:27

該類沒有viewcontroller。我創建了類來處理所有的UIImagePicker函數，所以我創建了一個對viewcontroller的弱引用，該引用使用這個類來管理我如何呈現imagePicker – Dee

你是如何將實際視圖控制器的引用傳遞給'weak var viewController： MyProfileVC！'？ –

對不起，延遲迴復。在CameraPicker的初始化方法中，我爲發件人添加了一個參數，將其引入弱變量 – Dee

我有同樣的問題，我已經找到了解決辦法，所以我發佈我的版本（我正在拍攝照片庫中的照片，但它是一樣的:)）。

我有內存管理問題。我創建了一個IBAction函數，我實例化了我的相機處理程序類（其中的代表...）。在函數結束時，變量超出範圍，並且它被釋放。爲了解決這個問題，我將它作爲實例變量。

這是我的代碼爲我的UIButton的VC：

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 
     } 
    } 
}

...這就是我的處理程序：

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) 
    } 
}

我纔能有一個更乾淨的代碼使用的封閉。

來源

2017-10-04 22:20:18 DungeonDev

爲什麼不把UIImagePickerController委託給我的Object類？

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