Question

screenshot http://i39.tinypic.com/oiermb.png

我正在为UIImagePickerController添加一个自定义叠加层，并且视图底部有一个持久的黑条。这是我实例化控制器的代码。

- (UIImagePickerController *)imagePicker {
    if (_imagePicker) {
        return _imagePicker;
    }

    _imagePicker = [[UIImagePickerController alloc] init];
    _imagePicker.delegate = self;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        _imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

        _imagePicker.showsCameraControls = NO;

        _imagePicker.wantsFullScreenLayout = YES;
        _imagePicker.navigationBarHidden = YES;
        _imagePicker.toolbarHidden = YES;

    } else {
        _imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }

    return _imagePicker;
}

当我没有隐藏相机控件时，返回的控制器以模态显示并且工作正常（即显示全屏）。

感谢Ole的建议，我使用了这段代码：

// Resize the camera preview
        _imagePicker.cameraViewTransform = CGAffineTransformMakeScale(1.0, 1.03);

高度增加3％就可以了。当我在屏幕底部添加自定义工具栏时，窗口上不再有可见的黑条。

Answer 1

按固定价值进行缩放并不是一个好主意......因为我确信在iPhone 5出现时，任何使用此接受答案的人都可能会发现。

这是一个代码片段，可根据屏幕分辨率动态缩放以消除字母装箱。

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

// iOS is going to calculate a size which constrains the 4:3 aspect ratio
// to the screen size. We're basically mimicking that here to determine
// what size the system will likely display the image at on screen.
// NOTE: screenSize.width may seem odd in this calculation - but, remember,
// the devices only take 4:3 images when they are oriented *sideways*.
float cameraAspectRatio = 4.0 / 3.0;
float imageWidth = floorf(screenSize.width * cameraAspectRatio);
float scale = ceilf((screenSize.height / imageWidth) * 10.0) / 10.0;

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

Answer 2

相机的宽高比为4：3，屏幕的宽高比为3：2。所以除非你愿意裁剪到3：2，否则根本无法让相机图片填满屏幕。为此，请应用适当的比例变换。

Answer 3

嘿，我看到有些人在计算iPhone 5的比例后仍然在底部的黑色条。我有一段时间有这个问题，但后来我发现你必须翻译视图所以它在中间屏幕然后应用比例。这是我做这两件事的代码，对我有用！

    CGSize screenBounds = [UIScreen mainScreen].bounds.size;

    CGFloat cameraAspectRatio = 4.0f/3.0f;

    CGFloat camViewHeight = screenBounds.width * cameraAspectRatio;
    CGFloat scale = screenBounds.height / camViewHeight;

    m_imagePickerController.cameraViewTransform = CGAffineTransformMakeTranslation(0, (screenBounds.height - camViewHeight) / 2.0);
    m_imagePickerController.cameraViewTransform = CGAffineTransformScale(m_imagePickerController.cameraViewTransform, scale, scale);

Answer 4

用它转换它：

#define CAMERA_TRANSFORM                    1.12412

_picker.wantsFullScreenLayout = YES;
_picker.cameraViewTransform = CGAffineTransformScale(_picker.cameraViewTransform, CAMERA_TRANSFORM, CAMERA_TRANSFORM);

Answer 5

根据我在iOS 7，iphone 5S上的经验，要看到图片中心进入全屏预览，你必须连接转换，而不是按顺序进行转换：

pickerController.cameraOverlayView = self.view;

CGSize screenSize = [[UIScreen mainScreen] bounds].size;   // 320 x 568

float scale = screenSize.height / screenSize.width*3/4;  // screen height divided by the pickerController height ... or:  568 / ( 320*4/3 )

CGAffineTransform translate=CGAffineTransformMakeTranslation(0,(screenSize.height - screenSize.width*4/3)*0.5);
CGAffineTransform fullScreen=CGAffineTransformMakeScale(scale, scale);
pickerController.cameraViewTransform =CGAffineTransformConcat(fullScreen, translate);

Answer 6

这里是Swift的答案。

let screenSize:CGSize = UIScreen.mainScreen().bounds.size

let ratio:CGFloat = 4.0 / 3.0
let cameraHeight:CGFloat = screenSize.width * ratio
let scale:CGFloat = screenSize.height / cameraHeight

let imag:UIImagePickerController = UIImagePickerController()
imag.cameraViewTransform = CGAffineTransformMakeTranslation(0, (screenSize.height - cameraHeight) / 2.0)
imag.cameraViewTransform = CGAffineTransformScale(imag.cameraViewTransform, scale, scale)

Answer 7

这适用于iOS 10：

let screenSize = UIScreen.main.bounds.size
let cameraAspectRatio = CGFloat(4.0 / 3.0)
let cameraImageHeight = screenSize.width * cameraAspectRatio
let scale = screenSize.height / cameraImageHeight
imagePickerController.cameraViewTransform = CGAffineTransform(translationX: 0, y: (screenSize.height - cameraImageHeight)/2)
imagePickerController.cameraViewTransform = imagePickerController.cameraViewTransform.scaledBy(x: scale, y: scale)

Answer 8

我用这种方法来计算比例。

// get the screen size
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
// establish the height to width ratio of the camera
float heightRatio = 4.0f / 3.0f;
// calculate the height of the camera based on the screen width
float cameraHeight = screenSize.width * heightRatio;
// calculate the ratio that the camera height needs to be scaled by
float scale = screenSize.height / cameraHeight;
imagePicker.cameraViewTransform = CGAffineTransformMakeScale(scale, scale);

Answer 9

我的问题解决了：）

//Camera is 426 * 320. Screen height is 568.  Multiply by 1.333 in 5 inch (iPhone5) 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 10

这些解决方案对我来说根本不起作用。在iOS 13.x下运行并使用iPhone 6+和iPhone 11 Pro的底部仍然存在一个黑条。通过计算到中心的偏移量并将其应用于比例计算，我能够解决这两个问题，而无需使用幻数。 6+和11 Pro都可以再次使用。

    let screenSize = UIScreen.main.bounds.size
    let cameraAspectRatio = CGFloat(4.0 / 3.0)
    let cameraImageHeight = screenSize.width * cameraAspectRatio
    let offsetToCenter = screenSize.height - cameraImageHeight
    let scale = (screenSize.height + offsetToCenter) / cameraImageHeight

    if UIImagePickerController.isSourceTypeAvailable(.camera) {
        myPickerController.delegate = self
        myPickerController.sourceType = .camera
        myPickerController.showsCameraControls = false
        myPickerController.allowsEditing = false
        myPickerController.cameraViewTransform = CGAffineTransform(scaleX: scale, y: scale)
        myPickerController.cameraOverlayView = CameraOverlay(frame: vc.view.frame, delegate: self)
        currentVC.present(myPickerController, animated: true)
    }
}

Answer 11

尝试使用此代码：

picker.wantsFullScreenLayout = YES;
CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, 71.0);
CGAffineTransform scale = CGAffineTransformScale(translate, 1.333333, 1.47);
picker.view.transform = scale;

Answer 12

PickerViewController.m    
#define CAMERA_TRANSFORM  1.8

- (void)viewDidAppear:(BOOL)animated
{
 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
       // type = UIImagePickerControllerSourceTypeCamera;

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.allowsEditing = NO;
        picker.delegate   = self;
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        picker.showsCameraControls=NO;
        picker.extendedLayoutIncludesOpaqueBars = YES;
        picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, CAMERA_TRANSFORM , CAMERA_TRANSFORM);

        [self presentViewController:picker animated:YES completion:nil];
    }else{

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message"
                                                        message:@"Device have no camera"
                                                       delegate:self
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
    }
}

Answer 13

这是 Swift 4

let screenSize: CGSize = picker.view.safeAreaLayoutGuide.layoutFrame.size
let ratio: CGFloat = 4.0 / 3.0
let cameraHeight: CGFloat = screenSize.width * ratio
let scale: CGFloat = (screenSize.height + 80) / cameraHeight
picker.cameraViewTransform = picker.cameraViewTransform.scaledBy(x: scale, y: scale)

Answer 14

雨燕5

100％工作简单的解决方案如果要在某些自定义UIView中显示摄像机，请使用该代码和摄像机将以全屏显示

class ViewController: UIViewController, UINavigationControllerDelegate,UIImagePickerControllerDelegate {


}

上半部分是代表，下半部分是函数

//Mark:- Call this function and enjoy
var imagePickers:UIImagePickerController?
func addCameraInView(){
    imagePickers = UIImagePickerController()
    if UIImagePickerController.isCameraDeviceAvailable( UIImagePickerController.CameraDevice.rear) {
        imagePickers?.delegate = self
        imagePickers?.sourceType = UIImagePickerController.SourceType.camera
        //imagePickers?.view.frame = customCameraView.bounds
        imagePickers?.view.contentMode = .scaleAspectFit
        imagePickers?.allowsEditing = false
        imagePickers?.showsCameraControls = false
        imagePickers?.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

       //Mark:- this part is handling camera in full screen in a custom view
       // let screenSize = UIScreen.main.bounds.size
        let screenSize = customCameraView.bounds.size
        let cameraAspectRatio = CGFloat(4.0 / 4.0)
        let cameraImageHeight = screenSize.width * cameraAspectRatio
        let scale = screenSize.height / cameraImageHeight
        imagePickers?.cameraViewTransform = CGAffineTransform(translationX: 0, y: (screenSize.height - cameraImageHeight)/2)
        imagePickers?.cameraViewTransform = (imagePickers?.cameraViewTransform.scaledBy(x: scale, y: scale))!

        // Add the child's View as a subview
        self.customCameraView.addSubview((imagePickers?.view)!)
    }
}

如果要在主屏幕上使用它，则需要更改比例（4.0 / 3.0）

   let screenSize = UIScreen.main.bounds.size
   let cameraAspectRatio = CGFloat(4.0 / 3.0)

UIImagePickerController没有填充屏幕

14 个答案: