有没有办法在iOS7上拍照时不使用代码水平翻转？答案

【问题标题】：Is there a way when you take a picture on iOS7 to not have it flip horizontally using code?有没有办法在iOS7上拍照时不使用代码水平翻转？
【发布时间】：2013-12-10 19:48:20
【问题描述】：

我想知道这是否真的可以做到。我知道我可以翻转 UIImageView，但是 iOS 7 上的相机会在您选择它以显示在 uiimageview 中之前显示水平翻转的图片。有什么办法可以解决这个烦恼吗？如果有请告诉我。这对用户来说可能非常烦人，因为他们可能不知道更好。编辑：这是我的代码。

        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
    }

    // image picker needs a delegate,
    [imagePickerController setDelegate:self];

    // Place image picker on the screen
    [self presentModalViewController:imagePickerController animated:YES];

【问题讨论】：

我想我可以帮忙，但需要更多详细信息 - 您使用的是 UIImagePickerController 还是创建了自己的相机捕获实例？
uiimagepickercontroller 我会更新一些代码

标签： ios objective-c uiimageview camera

【解决方案1】：

根据Apple's UIImagePickerClass Reference，您不能轻松做到这一点：

重要提示：UIImagePickerController 类仅支持纵向模式。此类旨在按原样使用，不支持子类化。此类的视图层次结构是私有的，不得修改，但有一个例外。您可以将自定义视图分配给 cameraOverlayView 属性，并使用该视图来显示附加信息或管理相机界面和代码之间的交互。

这意味着，如果您想弄乱方向，您将需要创建自己的相机控制器并自行处理。查看this stack overflow question and answer 了解更多关于这些方面的信息。编码愉快！

【讨论】：

【解决方案2】：

Swift 中的完整工作示例，它回答了本文最初的问题（在 iPhone 5c 上使用 iOS 8.2 测试）：

        import UIKit

        class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIActionSheetDelegate {

         @IBOutlet var myUIImageView: UIImageView!

         var myUIImagePickerController: UIImagePickerController!

         override func viewDidLoad() {
             super.viewDidLoad()
         }

         override func viewWillAppear(animated: Bool) {
             println("viewWillAppear(animated: Bool) method called.")
             super.viewWillAppear(animated)
             NSNotificationCenter.defaultCenter().removeObserver(self)
         }

         override func viewWillDisappear(animated: Bool) {
             println("viewWillDisappear(animated: Bool) method called.")
             super.viewWillDisappear(animated)
             NSNotificationCenter.defaultCenter().addObserver(self, selector: "cameraChanged:", name: "AVCaptureDeviceDidStartRunningNotification", object: nil)
         }

         /* UIImagePickerControllerDelegate Section */
         func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
              if(self.myUIImagePickerController.sourceType == UIImagePickerControllerSourceType.Camera) {
                 self.myUIImageView.image = info[UIImagePickerControllerEditedImage] as? UIImage
              } else {
                 self.myUIImageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
              }
              self.dismissViewControllerAnimated(true, completion: nil)
         }

        func imagePickerControllerDidCancel(picker: UIImagePickerController) {
            self.dismissViewControllerAnimated(true, completion: nil)
        }

        /*
        You can choose to use one of the UIResponder methods:
        touchesBegan, touchesMoved, touchesEnded etc, in order to detect the touch
        on the UIImageView.
        */
        override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
            let touch: UITouch? = touches.anyObject() as? UITouch
            if (touch?.view == myUIImageView) {
                println("myUIImageView has been tapped by the user.")
                self.takingAPictureUsingTheCamera()
            }
        }

        func takingAPictureUsingTheCamera() {
            self.myUIImagePickerController = UIImagePickerController()
            self.myUIImagePickerController.delegate = self // Set the delegate
            self.myUIImagePickerController.sourceType = UIImagePickerControllerSourceType.Camera
            self.myUIImagePickerController.cameraDevice = UIImagePickerControllerCameraDevice.Front
    //        self.myUIImagePickerController.editing = true
            self.myUIImagePickerController.allowsEditing = true
            self.presentViewController(self.myUIImagePickerController, animated: true, completion: nil)
        }

        func cameraChanged(notification: NSNotification) {
             println("cameraChanged(notification: NSNotification) method called.")
             self.myUIImagePickerController.cameraViewTransform = CGAffineTransformIdentity
             if(self.myUIImagePickerController.cameraDevice == UIImagePickerControllerCameraDevice.Front){
                 self.myUIImagePickerController.cameraViewTransform = CGAffineTransformScale(self.myUIImagePickerController.cameraViewTransform, -1, 1)
             }
        }
       }// End class

【讨论】：