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;