小编Sla*_*ena的帖子

我正在AR项目中工作,我们想要操纵iPhone4相机的对焦距离.这甚至可能吗？到目前为止,我们发现只需将切换和自动聚焦作为此处列出的选项:http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVCaptureDevice_Class/Reference/Reference.html%23//apple_ref/OCC/instm/AVCaptureDevice/isAdjustingFocus

提前感谢任何提示!:)

我已经在这几天敲打了我的脑袋.

我想在CALayer(AVCaptureVideoPreviewLayer)上绘制一个矩形,恰好是iPhone4上摄像头的视频输入.

这是我设置的一部分;

    //(in function for initialization)

        -(void)initDevices {
           AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput                   deviceInputWithDevice:[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo] error:nil];

           AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];
           captureOutput.alwaysDiscardsLateVideoFrames = YES; 
           captureOutput.minFrameDuration = CMTimeMake(1, 30);
           dispatch_queue_t queue;
           queue = dispatch_queue_create("cameraQueue", NULL);
           [captureOutput setSampleBufferDelegate:self queue:queue];
           dispatch_release(queue);

           NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey; 
           NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]; 
           NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; 
           [captureOutput setVideoSettings:videoSettings]; 
           self.captureSession = [[AVCaptureSession alloc] init];
           [self.captureSession addInput:captureInput];
           [self.captureSession addOutput:captureOutput];
           [self.captureSession setSessionPreset:AVCaptureSessionPresetHigh];   
           self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession: self.captureSession];
           self.prevLayer.frame = CGRectMake(0, 0, 400, 400); 
           self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; …