ios - 相机不聚焦在运行 iOS 7.1 的 iPhone 4 上

Question

iOS 从 7.0.6 升级到 7.1.0 后，我们遇到了问题。我在运行 iOS 7.1 的 iPhone 4s、5、5c 和 5s 上都没有看到这个问题 对于所有非碎片化的谈话来说这么多。我正在发布相机初始化代码:

- (void)initCapture
{
    //Setting up the AVCaptureDevice (camera)
    AVCaptureDevice* inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    NSError* cameraError;
    if ([inputDevice lockForConfiguration:&cameraError])
    {
        if ([inputDevice isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus])
        {
            NSLog(@"AVCaptureDevice is set to video with continuous auto focus");
            CGPoint autofocusPoint = CGPointMake(0.5f, 0.5f);
            [inputDevice setFocusPointOfInterest:autofocusPoint];
            [inputDevice setFocusMode:AVCaptureFocusModeContinuousAutoFocus];
        }

        [inputDevice unlockForConfiguration];
    }

    //setting up the input streams
    AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil];

    //setting up up the AVCaptureVideoDataOutput
    AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init];
    captureOutput.alwaysDiscardsLateVideoFrames = YES;
    [captureOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

    //setting up video settings
    NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
    NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
    NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];

    //passing the settings to the AVCaptureVideoDataOutput
[captureOutput setVideoSettings:videoSettings];

    //setting up the AVCaptureSession
    captureSession = [[AVCaptureSession alloc] init];
    captureSession.sessionPreset = AVCaptureSessionPresetMedium;

    [captureSession addInput:captureInput];
    [captureSession addOutput:captureOutput];

    if (!prevLayer)
{
        prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession];
    }
    NSLog(@"initCapture preview Layer %p %@", self.prevLayer, self.prevLayer);
    self.prevLayer.frame = self.view.bounds;
    self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [self.view.layer addSublayer: self.prevLayer];

    [self.captureSession startRunning];
}

任何帮助将不胜感激......

Answer 1

您正在使用的 Apple 提供的代码已经过时 - 他们现在已经完全重写了它。我会试试运气并尝试新的工作流程。

检查一下 here .