如何使用设备摄像头在iphone应用程序中编程拍摄图片？

Question

在programmatically应用程序中，我们是否可以使用iPhone设备摄像头programmatically在特定的时间间隔内拍摄图片？

如果是的话，请告诉我如何在iPhone应用程序中以编程方式拍摄照片？

请帮忙并提出建议。

谢谢,

Answer 1

UIImagePickerController有一个可以以编程方式调用的takePicture方法。

Answer 2

您可以使用UIImagePickerController有一个takePicture方法来拍照。

要获得对图片的更多控制，可以使用包含avcapturestillimageoutput方法的AVFoundation头来捕获图像。更多信息

Answer 3

在.h中导入此文件：

AVFoundation/AVCaptureInput.h
AVFoundation/AVCaptureDevice.h
AVFoundation/AVCaptureOutput.h
AVFoundation/AVMediaFormat.h    

放入.m：

- (AVCaptureDevice *)frontCamera
{
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices)
    {
        if ([device position] == AVCaptureDevicePositionFront)
        {
            return device;
        }
    }
    return nil;
}

- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection
{
    CGImageRef cgImage = [self imageFromSampleBuffer:sampleBuffer];
    self.theImage = [UIImage imageWithCGImage: cgImage ];
    CGImageRelease( cgImage );

    NSCalendar *sysCalendar = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateFormatter *df = [[NSDateFormatter alloc]init];
    df.calendar = sysCalendar;
    [df setDateFormat:@"dd_MM_yyyy hh:mm:ss"];
    StrCapture = [NSString stringWithFormat:@"%@.jpeg",[df stringFromDate:[NSDate date]]];
    NSLog(@"StrCapture : %@",StrCapture);

    NSData *imageData = UIImageJPEGRepresentation(self.theImage,1);
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:StrCapture];
    [fileManager createFileAtPath:fullPath contents:imageData attributes:nil];

    NSLog(@"ImagePAth : %@",fullPath);
}

- (CGImageRef) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
    CVPixelBufferLockBaseAddress(imageBuffer,0);
    uint8_t baseAddress = (uint8_t )CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0);
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
    size_t width = CVPixelBufferGetWidth(imageBuffer);
    size_t height = CVPixelBufferGetHeight(imageBuffer);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
    CGImageRef newImage = CGBitmapContextCreateImage(newContext);
    CGContextRelease(newContext);

    CGColorSpaceRelease(colorSpace);
    CVPixelBufferUnlockBaseAddress(imageBuffer,0);

    return newImage;
}