IOS-闪光灯操作

AVCaptureDevice.h主要用来获取iphone一些关于相机设备的属性。

前置和后置摄像头

enum {
AVCaptureDevicePositionBack                = 1,
AVCaptureDevicePositionFront               = 2
};
typedef NSInteger
 
闪光灯开关
 
enum {
AVCaptureFlashModeOff  = 0,
AVCaptureFlashModeOn   = 1,
AVCaptureFlashModeAuto = 2
};
typedef NSInteger
 
手电筒开关
 
enum {
AVCaptureTorchModeOff  = 0,
AVCaptureTorchModeOn   = 1,
AVCaptureTorchModeAuto = 2,
};
typedef NSInteger
 
焦距调整
 
enum {
AVCaptureFocusModeLocked              = 0,
AVCaptureFocusModeAutoFocus           = 1,
AVCaptureFocusModeContinuousAutoFocus = 2,
};
typedef NSInteger
 
曝光量调节
 
enum {
AVCaptureExposureModeLocked = 0,
AVCaptureExposureModeAutoExpose = 1,
AVCaptureExposureModeContinuousAutoExposure = 2,
};
typedef NSInteger
 
白平衡
 
enum {
AVCaptureWhiteBalanceModeLocked         = 0,
AVCaptureWhiteBalanceModeAutoWhiteBalance         = 1,
2,
};
typedef NSInteger

开启闪光灯

AVCaptureDevice* d = nil; // find a device by positionNSArray* allDevices = [AVCaptureDevice devices]; for (AVCaptureDevice* currentDevice in allDevices) {   if (currentDevice.position == AVCaptureDevicePositionBack) {     d = currentDevice;   } } // at this point, d may still be nil, assuming we found something we like.... NSError* err = nil; BOOL lockAcquired = [d lockForConfiguration:&err]; if (!lockAcquired) {    // log err and handle... } else {   // flip on the flash mode    if ([d hasFlash] && [d isFlashModeSupported:AVCaptureFlashModeOn] ) {       [d setFlashMode:AVCaptureFlashModeOn];    }    [d unlockForConfiguration]; }