AVCaptureDevice

AVCaptureDevice.h，主要用来获取iphone一些关于相机设备的属性。AVCaptureDevice.h，必须要引入AVFoundation.framework包。

​1. 前置和后置摄像头

​enum {  

  AVCaptureDevicePositionBack = 1,   

 AVCaptureDevicePositionFront = 2

​};typedef NSInteger AVCaptureDevicePosition;

​2. 闪光灯开关

​enum {    

AVCaptureFlashModeOff = 0,    

AVCaptureFlashModeOn = 1,  

  AVCaptureFlashModeAuto = 2

​};typedef NSInteger AVCaptureFlashMode;

​3. 手电筒开关

​enum {  

  AVCaptureTorchModelOff = 0,  

  AVCaptureTorchModelOn = 1,  

  AVCaptureTorchModeAuto = 2

​};typedef NSInteger AVCaptureTorchMode;

​4. 焦距调整

​enum {   

 AVCaptureFocusModelLocked = 0,   

 AVCaptureFocusModeAutoFocus = 1,    AVCaptureFocusModeContinousAutoFocus = 2

};typedef NSInteger AVCaptureFocusMode;

5. 曝光量调节

enum {    

  AVCaptureExposureModeLocked = 0,    

​AVCaptureExposureModeAutoExpose = 1,          AVCaptureExposureModeContinuousAutoExposure = 2

};typedef NSInteger AVCaptureExposureMode;

6. 白平衡

enum {   

 AVCaptureWhiteBalanceModeLocked = 0,             AVCaptureWhiteBalanceModeAutoWhiteBalance = 1,            AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance = 2

};typedef NSInteger AVCaptureWhiteBalanceMode;