Ios 在自定义相机层上的AVFoundation中自动对焦和自动曝光

为AVFoundation自定义层相机创建精确的自动对焦和曝光的最佳方法是什么？。例如，当前我的相机预览层是方形的，我希望将相机对焦和曝光指定到该帧边界。我需要这在Swift 2如果可能的话，如果没有请写下你的答案，我将能够转换它自己

当前自动对焦和曝光：但正如您所见，这将在对焦时评估整个视图

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    //Get Touch Point
    let Point = touches.first!.locationInView(self.capture)
    //Assign Auto Focus and Auto Exposour
    if let device = currentCameraInput {
        do {
            try! device.lockForConfiguration()
            if device.focusPointOfInterestSupported{
                //Add Focus on Point
                device.focusPointOfInterest = Point
                device.focusMode = AVCaptureFocusMode.AutoFocus
            }

            if device.exposurePointOfInterestSupported{
                //Add Exposure on Point
                device.exposurePointOfInterest = Point
                device.exposureMode = AVCaptureExposureMode.AutoExpose
            }
            device.unlockForConfiguration()
        }
    }
}

覆盖函数触摸开始（触摸：设置，withEvent事件：UIEvent？）{
//获得接触点
让Point=touch.first！.locationInView（self.capture）
//指定自动对焦和自动曝光
如果let设备=currentCameraInput{
做{
试试！device.lockForConfiguration（）
如果支持device.focusPointOfInterest{
//把重点放在重点上
device.focusPointOfInterest=点
device.focusMode=AVCaptureFocusMode.AutoFocus
}
如果支持device.exposurePointOfInterest{
//增加曝光点
device.exposurePointOfInterest=点
device.exposureMode=AVCaptureExposureMode.AutoExpose
}
device.unlockForConfiguration（）
}
}
}

相机层：1:1比例的任何东西都应被视为焦点和曝光点，超出此范围的任何东西都不会被视为相机焦点的触摸事件

---

将根据AVCaptureVideoPreviewLayer的设置为您提供设备关注点。请参阅。

多亏了JLW，以下是您在Swift 2中的操作方法。首先，我们需要设置点击手势，您可以通过编程或故事板来实现

    //Add UITap Gesture Capture Frame for Focus and Exposure
    let captureTapGesture: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "AutoFocusGesture:")
    captureTapGesture.numberOfTapsRequired = 1
    captureTapGesture.numberOfTouchesRequired = 1
    self.captureFrame.addGestureRecognizer(captureTapGesture)

在

capturetapership

中基于选择器创建函数

/*=========================================
* FOCUS & EXPOSOUR
==========================================*/
var animateActivity: Bool!
internal func AutoFocusGesture(RecognizeGesture: UITapGestureRecognizer){
    let touchPoint: CGPoint = RecognizeGesture.locationInView(self.captureFrame)
    //GET PREVIEW LAYER POINT
    let convertedPoint = self.previewLayer.captureDevicePointOfInterestForPoint(touchPoint)

    //Assign Auto Focus and Auto Exposour
    if let device = currentCameraInput {
        do {
            try! device.lockForConfiguration()
            if device.focusPointOfInterestSupported{
                //Add Focus on Point
                device.focusPointOfInterest = convertedPoint
                device.focusMode = AVCaptureFocusMode.AutoFocus
            }

            if device.exposurePointOfInterestSupported{
                //Add Exposure on Point
                device.exposurePointOfInterest = convertedPoint
                device.exposureMode = AVCaptureExposureMode.AutoExpose
            }
            device.unlockForConfiguration()
        }
    }
}

此外，如果您想使用动画指示器，请在触摸事件时使用接触点，并将其指定给动画层

//Assign Indicator Position
touchIndicatorOutside.frame.origin.x = touchPoint.x - 10
touchIndicatorOutside.frame.origin.y = touchPoint.y - 10

---

您正在使用AVCaptureVideoPreviewLayer吗？如果是：

public func captureDevicePointOfInterestForPoint（pointInLayer:CGPoint）->CGPoint

@jlw是的，我正在使用

AVCaptureVideoPreviewLayer

，但我没有看到该函数。：/@哇，我怎么会错过呢？请纠正你的回答，我会接受的。谢谢

//Assign Indicator Position
touchIndicatorOutside.frame.origin.x = touchPoint.x - 10
touchIndicatorOutside.frame.origin.y = touchPoint.y - 10