ios - 子类化 UIImagePickerController 以添加功能

Question

基本上我想做的是，将“拍摄图像”按钮更改为我的自定义按钮。当用户改变 DeviceOrientation 时，按钮会根据方向改变。我已经尝试过使用“overLay”属性，但似乎无法在放置后更改或移动“overLay”。所以我决定子类化 UIImagePickerController，但是当我调用它来呈现时，相机根本不会显示!

任何有助于理解问题所在的帮助...谢谢!!

这是 viewController 调用子类“UIImagePickerController”:

@interface CameraViewController : UIViewController<UIImagePickerControllerDelegate>
@interface CameraViewController ()
@property (nonatomic) pickerControllerMC *cameraPickerView;

self.cameraPickerView = [[pickerControllerMC alloc]initWithNibName:@"pickerControllerMC"       bundle:nil];
self.cameraPickerView.delegate = self;


// Do any additional setup after loading the view.
//create a new image picker instance
//set source to video!
self.cameraPickerView.sourceType = UIImagePickerControllerSourceTypeCamera;
//hide all controls
self.cameraPickerView.showsCameraControls = NO;
self.cameraPickerView.navigationBarHidden = YES;
self.cameraPickerView.toolbarHidden = YES;
//  self.delegate = self;
//make the video preview full size
self.cameraPickerView.wantsFullScreenLayout = YES;
self.cameraPickerView.cameraViewTransform =
CGAffineTransformScale(self.cameraPickerView.cameraViewTransform,
                       CAMERA_TRANSFORM_X,
                       CAMERA_TRANSFORM_Y);

//Getting WidthAnd hight
CGRect screen = [[UIScreen mainScreen] bounds];
//CGFloat widthInPixel = screen.size.width * scaleFactor;
//CGFloat heightInPixel = screen.size.height * scaleFactor;
int Width = screen.size.width;
int hight = screen.size.height;

[self presentViewController:self.cameraPickerView animated:YES completion:nil];

这是子类:

 @interface pickerControllerMC : UIImagePickerController

 @implementation pickerControllerMC

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
    }

    - (void)viewDidLoad
     {
    [super viewDidLoad];

    UIButton *buttonTakeImage = [UIButton
                        buttonWithType:UIButtonTypeRoundedRect];
    [buttonTakeImage setBackgroundImage:[UIImage imageNamed:@"CameraButton@2x"]     forState:UIControlStateNormal];

    [buttonTakeImage addTarget:self action:@selector(takePictureClicked)     forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:self.overlay];
    [self.view addSubview:buttonTakeImage];


    //Adding orientation Notifications!
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver: self selector:        @selector(deviceOrientationDidChange:) name: UIDeviceOrientationDidChangeNotification object: nil];


    }

编辑

好吧，我的错误是，我使用了“initWithNibName”，所以我每次都得到一个白色的 Nib 屏幕。一切都很好。

Answer 1

抱歉，您不能继承 UIImagePickerController。来自文档:

Important: The UIImagePickerController class supports portrait mode only. This class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified, with one exception. You can assign a custom view to the cameraOverlayView property and use that view to present additional information or manage the interactions between the camera interface and your code.

但是，您可以完全控制拍照 UI。

• 您可以为 UIImagePickerController 提供一个 cameraOverlayView。

• 完全避免 UIImagePickerController，方法是使用 AVFoundation 类来实现拍照，并使用您自己的 UIViewController 子类作为 Controller 和管理 View 用户界面和行为。参见 https://developer.apple.com/library/mac/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html .