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当我在Swift中制作定制的相机应用程序时。 但是，当我尝试访问相机时，相机中的视图旋转了90度。我试图找到解决方案。我找到的一个解决方案是添加fixOrientation函数来修复视图。但不工作... 这里是我的全码：相机视图在Swift中旋转90度
let CIHueAdjust = "CIHueAdjust"
let CIHueAdjustFilter = CIFilter(name: "CIHueAdjust", withInputParameters: ["inputAngle" : 1.24])
let Filters = [CIHueAdjust: CIHueAdjustFilter]
let FilterNames = [String](Filters.keys).sort()
class LiveCamViewController : UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate{
let mainGroup = UIStackView()
let imageView = UIImageView(frame: CGRectZero)
let filtersControl = UISegmentedControl(items: FilterNames)
override func viewDidLoad()
{
super.viewDidLoad()
view.addSubview(mainGroup)
mainGroup.axis = UILayoutConstraintAxis.Vertical
mainGroup.distribution = UIStackViewDistribution.Fill
mainGroup.addArrangedSubview(imageView)
mainGroup.addArrangedSubview(filtersControl)
imageView.contentMode = UIViewContentMode.ScaleAspectFit
filtersControl.selectedSegmentIndex = 0
let captureSession = AVCaptureSession()
captureSession.sessionPreset = AVCaptureSessionPresetPhoto
let backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
do
{
let input = try AVCaptureDeviceInput(device: backCamera)
captureSession.addInput(input)
}
catch
{
print("can't access camera")
return
}
//get captureOutput invoked
let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
let videoOutput = AVCaptureVideoDataOutput()
videoOutput.setSampleBufferDelegate(self, queue: dispatch_queue_create("sample buffer delegate", DISPATCH_QUEUE_SERIAL))
if captureSession.canAddOutput(videoOutput)
{
captureSession.addOutput(videoOutput)
}
captureSession.startRunning()
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!)
{
guard let filter = Filters[FilterNames[filtersControl.selectedSegmentIndex]] else
{
return
}
let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)
let cameraImage = CIImage(CVPixelBuffer: pixelBuffer!)
filter!.setValue(cameraImage, forKey: kCIInputImageKey)
let filteredImage = UIImage(CIImage: filter!.valueForKey(kCIOutputImageKey) as! CIImage!)
let fixedImage = fixOrientation(filteredImage)
dispatch_async(dispatch_get_main_queue())
{
self.imageView.image = fixedImage
}
}
func fixOrientation(image: UIImage) -> UIImage {
if (image.imageOrientation == UIImageOrientation.Up) {
return image;
}
print(image.imageOrientation)
var transform = CGAffineTransformIdentity
switch (image.imageOrientation) {
case .Down, .DownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI))
break
case .Left, .LeftMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0)
transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2))
break
case .Right, .RightMirrored:
transform = CGAffineTransformTranslate(transform, 0, image.size.height)
transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2))
break
case .Up, .UpMirrored:
break
}
switch (image.imageOrientation) {
case .UpMirrored, .DownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0)
transform = CGAffineTransformScale(transform, -1, 1)
break
case .LeftMirrored, .RightMirrored:
transform = CGAffineTransformTranslate(transform, image.size.height, 0)
transform = CGAffineTransformScale(transform, -1, 1)
break
case .Up, .Down, .Left, .Right:
break
}
//Draw the underlying CGImage into a new context, applying the transform
let ctx = CGBitmapContextCreate(nil, Int(image.size.width), Int(image.size.height), CGImageGetBitsPerComponent(image.CGImage), 0, CGImageGetColorSpace(image.CGImage), UInt32(CGImageGetBitmapInfo(image.CGImage).rawValue))
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
case .Left, .LeftMirrored, .Right, .RightMirrored:
CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.height, image.size.width), image.CGImage)
break
default:
CGContextDrawImage(ctx, CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage)
break
}
let cgimg = CGBitmapContextCreateImage(ctx)
let img = UIImage(CGImage:cgimg!)
return img
}
override func viewDidLayoutSubviews()
{
mainGroup.frame = CGRect(x: 37, y: 115, width: 301, height: 481)
}
}
我设置一个断点测试，代码似乎仅运行到
if (image.imageOrientation == UIImageOrientation.Up) {
return image;
}
则返回相同查看...
任何人都可以帮我吗？ 谢谢！
所以image.imageOrientation == UIImageOrientation.Up是真的，注释该部分如果你想测试下面的逻辑。 – LoVo
@LoVo嗨，thx回复。我评论过这些。但我仍然有一些错误。像CGBitmapContextCreate：不受支持的参数组合，CGContextConcatCTM：无效上下文0x0，CGContextDrawImage：无效上下文0x0，CGBitmapContextCreateImage：无效上下文0x0。我不知道什么是错的：（ – dididaisy
你可以在崩溃前检查'ctx'和'transform'的值吗？ – LoVo