在 iOS 上创建具有方形视图的自定义相机

问题描述

我正在尝试在 iOS 上创建自定义相机体验，以下代码片段就是我所得到的.基本上我想要通常的相机视图(即使用以下按钮:捕获、闪光、网格、前/后、取消).但是普通相机和我的唯一区别是我想要预览表面的正方形；不是矩形.然后，您所见即所得(所见即所得)，因此无需裁剪；因为用户首先会拍一张方形照片.

I am trying to create a custom camera experience on iOS and the following code snippet is as far as I got. Basically I want the usual camera view (i.e. with the following buttons: capture, flash, grid, front/back, cancel). But the only difference between the normal camera and mine is that I want a square for the preview surface; not a rectangle. And then, what you see is what you get (WYSIWYG) such that there is no cropping necessary; as the user would have taken a square picture in the first place.

我也一直在查看库 https://github.com/danielebogo/DBCamera 但我没有看到如何定制它到我的目的.有什么帮助吗?谢谢.

I have also been looking at the library https://github.com/danielebogo/DBCamera but I am not seeing how to customize it to my end. Any help? Thanks.

到目前为止我的代码:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    //Capture Session
    AVCaptureSession *session = [[AVCaptureSession alloc]init];
    session.sessionPreset = AVCaptureSessionPresetPhoto;

    //Add device
    AVCaptureDevice *device =
    [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    //Input
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

    if (!input)
    {
        NSLog(@"No Input");
    }

    [session addInput:input];

    //Output
    AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
    [session addOutput:output];
    output.videoSettings =
    @{ (NSString *)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA) };

    //Preview Layer
    AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    UIView *myView = self.view;
    previewLayer.frame = myView.bounds;
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [self.view.layer addSublayer:previewLayer];

    //Start capture session
    [session startRunning];
}

这是 Xcode 上单视图项目中唯一的自定义代码

This is the only custom code in a single view project on Xcode

推荐答案

你有两种选择来做你想做的事，要么坚持并自定义 UIImagePickerController，要么使用 UIImagePickerController 创建自己的代码>AVFoundation.

You have two options for doing what you want, either stick with and customize a UIImagePickerController, or create your own by using the AVFoundation.

UIImagePickerController 确实提供了相当多的自定义选项，这个类似的线程对此有一些很好的信息:链接.

The UIImagePickerController does provide a fair bit of customization options, and this similar thread has some good information on that: link.

如果您仍想自己制作，我建议您前往 Apple 文档并查看这个名为 AVCam 的演示项目:链接.但是，它比您可能需要的更深入，所以我也可以推荐这个视频教程:链接.

If you still want to make your own, I suggest heading over to the Apple Documentation and checking out this demo project called AVCam: link. However, it's way more in-depth than you'll probably need so I can recommend this video tutorial as well: link.

如果选择最后一个选项，我想提一下，要使实际相机"适合您的 previewLayer 的框架，您可以将 videoGravity 设置为AVCaptureVideoPreviewLayer 到 AVLayerVideoGravityResizeAspectFill.

If going for the last option, I would like to mention that to make the "actual camera" fit the frame of your previewLayer, you can set the videoGravity on the AVCaptureVideoPreviewLayer to AVLayerVideoGravityResizeAspectFill.

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