如何使用AVFoundation强制iOS相机以编程方式拍照？ [英] How to force iOS camera to take a picture programmatically using AVFoundation?

问题描述

我需要iOS相机在没有用户输入的情况下拍照。我该怎么做呢？这是我到目前为止的代码：

I need the iOS camera to take a picture without any input from the user. How would I go about doing this? This is my code so far:

-(void)initCapture{
    AVCaptureDeviceInput *newVideoInput = [[AVCaptureDeviceInput alloc] init];

    AVCaptureStillImageOutput *newStillImageOutput = [[AVCaptureStillImageOutput alloc] init];

    NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:
                                AVVideoCodecJPEG, AVVideoCodecKey,
                                nil];


    [newStillImageOutput setOutputSettings:outputSettings];


    AVCaptureSession *newCaptureSession = [[AVCaptureSession alloc] init];

    if ([newCaptureSession canAddInput:newVideoInput]) {
        [newCaptureSession addInput:newVideoInput];
    }
    if ([newCaptureSession canAddOutput:newStillImageOutput]) {
        [newCaptureSession addOutput:newStillImageOutput];
    }
    self.stillImageOutput = newStillImageOutput;
}

我还需要添加什么以及从哪里开始？我不想拍摄视频，只拍摄一张静止图片。另外，之后如何将图像转换为UIImage？谢谢

What else do I need to add and where do I go from here? I don't want to take a video, only a single still image. Also, how would I convert the image into a UIImage afterwards? Thanks

推荐答案

你有一个AVCaptureStillImageOutput， stillImageOutput 。此外，您需要将捕获会话存储在以后可以获取的位置。称之为 self.sess 。然后：

You've got an AVCaptureStillImageOutput, stillImageOutput. Plus you need to have stored your capture session where you can get at it later. Call it self.sess. Then:

AVCaptureConnection *vc = 
    [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];
[self.sess startRunning];
[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:vc
                                          completionHandler:
 ^(CMSampleBufferRef buf, NSError *err) {
     NSData* data = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:buf];
     UIImage* im = [UIImage imageWithData:data];
     dispatch_async(dispatch_get_main_queue(), ^{
         UIImageView* iv = [[UIImageView alloc] initWithFrame:someframe];
         iv.contentMode = UIViewContentModeScaleAspectFit;
         iv.image = im;
         [self.view addSubview: iv];
         [self.iv removeFromSuperview]; // in case we already did this
         self.iv = iv;
         [self.sess stopRunning];
     });
 }];

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