质量：自定义AVFoundation相机应用程序VS. iOS标准相机应用程序

概述我使用各种主题和灯光进行了多项测试.每个测试都显示标准iOS相机应用程序的质量显着优于(颜色没有褪色,更好的聚焦,更好的照明,更少的颗粒感)到我的自定义基于AVFoundation的应用程序.我无法解释巨大的差异.下面是使用这两种方法拍摄的视频的屏幕截图(使用前置摄像头). iOS标准相机应用程序 自定义AVFoundation录制的视频 自定义实现代码： let chosenCameraType 我使用各种主题和灯光进行了多项测试.每个测试都显示标准iOS相机应用程序的质量显着优于(颜色没有褪色,更好的聚焦,更好的照明,更少的颗粒感)到我的自定义基于AVFoundation的应用程序.我无法解释巨大的差异.下面是使用这两种方法拍摄的视频的屏幕截图(使用前置摄像头).

iOS标准相机应用程序

自定义AVFoundation录制的视频

自定义实现代码：

let chosenCameraType = AVCaptureDeviceposition.Front//get cameralet devices = AVCaptureDevice.devices()for device in devices{    if (!device.hasMediaType(AVMediaTypeVIDeo))    {        continue    }    if (device.position != chosenCameraType)    {        continue    }    camera = (device as? AVCaptureDevice)!}do{    captureSession = AVCaptureSession()    captureSession!.sessionPreset = AVCaptureSessionPresetHigh          let vIDeo = try AVCaptureDeviceinput(device: camera) as AVCaptureDeviceinput    captureSession!.addinput(vIDeo)    let au@R_502_6901@ = try AVCaptureDeviceinput(device: AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAu@R_502_6901@)) as AVCaptureDeviceinput    captureSession!.addinput(au@R_502_6901@)    fileOutput = AVCaptureMovIEfileOutput()    captureSession?.addOutput(fileOutput)    captureSession!.startRunning()    let documentsPath = NSSearchPathForDirectorIEsInDomains(.documentDirectory,.UserDomainMask,true)[0] as Nsstring    let name = String(UInt64(NSDate().timeIntervalSince1970 * 1000))    fileOutput?.startRecordingToOutputfileURL(NSURL(fileURLWithPath: "\(documentsPath)/" + name + ".mov"),recordingDelegate: self)}catch let error as NSError{    print(error)}

请试试！你也会看到差异……

解决方法 我已经注意到你所描述的内容并查看了我看不到你实现的代码：

backCamera.focusPointOfInterest = focusPointbackCamera.focusMode = AVCaptureFocusMode.autoFocusbackCamera.exposureMode = AVCaptureExposureMode.autoExpose

我在touchesBegan中实现了这个,这样相机就可以专注于用户触摸屏幕的区域.这是代码部分：

overrIDe func touchesBegan(_ touches: Set<UItouch>,with event: UIEvent?) {        let touchPoint = touches.first        let x = (touchPoint?.location(in: self.vIEw).x)! / self.vIEw.bounds.wIDth        let y = (touchPoint?.location(in: self.vIEw).y)! / self.vIEw.bounds.height        let realX = (touchPoint?.location(in: self.vIEw).x)!        let realY = (touchPoint?.location(in: self.vIEw).y)!        let focusPoint = CGPoint(x: x,y: y)        let k = DrawSquare(frame: CGRect(            origin: CGPoint(x: realX - 75,y: realY - 75),size: CGSize(wIDth: 150,height: 150)))        if backCamera != nil {            do {                try backCamera.lockForConfiguration()                self.prevIEwVIEw.addSubvIEw(k)            }            catch {                print("Can't lock back camera for configuration")            }            if backCamera.isFocusPointOfInterestSupported {                backCamera.focusPointOfInterest = focusPoint            }            if backCamera.isFocusModeSupported(AVCaptureDevice.FocusMode.autoFocus) {                backCamera.focusMode = AVCaptureDevice.FocusMode.autoFocus            }            if backCamera.isExposureModeSupported(AVCaptureDevice.ExposureMode.autoExpose) {                backCamera.exposureMode = AVCaptureDevice.ExposureMode.autoExpose            }            backCamera.unlockForConfiguration()        }        dispatchQueue.main.asyncAfter(deadline: .Now() + .milliseconds(500)) {            k.removeFromSupervIEw()        }    }

当相机显示暗图像时,用户可以简单地点击屏幕,它将调整曝光和聚焦,从而使图像变亮.

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