如何让UIImagePicker相机的自定义叠加在iOS 7中全屏显示？

Question

我对使用UIImagePickerController整个屏幕的摄像机控件的自定义叠加感兴趣,非常类似于切换到视频功能时默认的摄像头应用程序所做的操作.

关于这个主题,我在这里引用了几个问题,尤其是这个问题,以及关于如何为UIImagePickerController使用自定义叠加层的Apple示例,但是它们都没有能够产生成功的全屏结果IOS 7.

到目前为止,这是相机UI与自定义叠加层(没有任何按钮)的样子:

请注意,屏幕底部有一个黑条.我注意到如果我将其更改为1,我可以删除黑条cameraAspectRatio,但是这会使相机变焦,因为它具有非常放大的视图.有没有办法让全屏没有太多扭曲变焦(我明白一点点是必要的),还删除黑条？

这是我配置自定义叠加层的代码:

{
        self.imagePickerController.showsCameraControls = NO;

        [[NSBundle mainBundle] loadNibNamed:@"overlayView" owner:self options:nil];
        self.overlayView.frame = self.imagePickerController.cameraOverlayView.frame;
        self.imagePickerController.cameraOverlayView = self.overlayView;
        self.overlayView = nil;

        // Device's screen size (ignoring rotation intentionally):
        CGSize screenSize = [[UIScreen mainScreen] bounds].size;


        float cameraAspectRatio = 4.0 / 3.0; //! Note: 4.0 and 4.0 works
        float imageWidth = floorf(screenSize.width * cameraAspectRatio);
        float scale = ceilf((screenSize.height / imageWidth) * 10.0) / 10.0;

        self.imagePickerController.cameraViewTransform = CGAffineTransformMakeScale(scale, scale);

    }

更新:

我注意到的另一个问题是,相机预览中显示的图片总是较小,并且细节少于方法时保存的图片[self.imagePickerController takePicture].为了显示:

这是键盘在相机预览中看起来像下面的黑色条(抱歉它有点不稳定):

但请注意,预览面板中的实际捕获图像具有更多详细信息,如此处所示,尤其是朝向顶部,以及左侧和右侧.

我的问题是,如何设置我的相机预览,以便用户在预览中看到的是它将捕获的图像,然后可以显示给他们？谢谢!

更新2

以下是viewDidLoad设置相机控件的完整代码.

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Appearance configuration
    self.navigationItem.hidesBackButton = YES;

    //UIImagePickerController initialization and setup
    self.imagePickerController = [[UIImagePickerController alloc] init];
    self.imagePickerController.delegate = self;
    self.imagePickerController.allowsEditing = NO;
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera; //if there is a camera avaliable
    } else {
        self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//otherwise go to the folder
    }
    self.imagePickerController.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil];
    if (self.imagePickerController.sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        self.imagePickerController.showsCameraControls = NO;

        [[NSBundle mainBundle] loadNibNamed:@"overlayView" owner:self options:nil];
        self.overlayView.frame = self.imagePickerController.cameraOverlayView.frame;
        self.imagePickerController.cameraOverlayView = self.overlayView;
        self.overlayView = nil;

        // Device's screen size (ignoring rotation intentionally):
        CGSize screenSize = [[UIScreen mainScreen] bounds].size;

        int heightOffset = 0;

        if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0"))
        {
            heightOffset = 120; //whole screen :)
        }

        float cameraAspectRatio = 4.0 / 3.0; //! Note: 4.0 and 4.0 works
        float imageWidth = floorf(screenSize.width * cameraAspectRatio);
        float scale = ceilf(((screenSize.height + heightOffset) / imageWidth) * 10.0) / 10.0;

        self.imagePickerController.cameraViewTransform = CGAffineTransformMakeScale(scale, scale);

    }
}

在viewWillAppear,我调用图像选择器视图:

BOOL modalPresent = (BOOL)(self.presentedViewController);
    //Present the Camera UIImagePicker if no image is taken
    if (!appDelegate.imageStorageDictionary[@"picture1"]){
        if (modalPresent == NO){ //checks if the UIImagePickerController is modally active
            [self presentViewController:self.imagePickerController animated:NO completion:nil];
        }
    }

Answer 1

经过多次尝试,这对我有用,非常感谢其他人的建议.以下事实非常有助于了解并牢记:

相机的点分辨率为426*320.为了将相机预览的高度拉伸到手机的屏幕高度568,使用时需要乘以系数1.3333 CGAffineTransformScale.

请注意,下面的内容是基于iPhone 5的分辨率屏幕分辨率使用各种数字进行硬编码的.它们可以通过使用诸如screen.height,screen.width和其他变量之类的对象来改进,以使其适用于iPhone 4/4s尺寸.

    self.imagePickerController.showsCameraControls = NO;

    [[NSBundle mainBundle] loadNibNamed:@"overlayView" owner:self options:nil];
    self.overlayView.frame = self.imagePickerController.cameraOverlayView.frame;
    self.imagePickerController.cameraOverlayView = self.overlayView;
    self.overlayView = nil;

    //For iphone 5+
    //Camera is 426 * 320. Screen height is 568.  Multiply by 1.333 in 5 inch to fill vertical
    CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 71.0); //This slots the preview exactly in the middle of the screen by moving it down 71 points
    self.imagePickerController.cameraViewTransform = translate;

    CGAffineTransform scale = CGAffineTransformScale(translate, 1.333333, 1.333333);
    self.imagePickerController.cameraViewTransform = scale;

Answer 2

在斯威夫特

var picker: UIImagePickerController = UIImagePickerController();

picker.sourceType = UIImagePickerControllerSourceType.Camera;

picker.showsCameraControls = false;

var screenBounds: CGSize = UIScreen.mainScreen().bounds.size;

var scale = screenBounds.height / screenBounds.width;

picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, scale, scale);