关于AVCaptureDevice

获取手机上的设备
+ (NSArray *)devices;
获取手机上某种类型的设备
+ (NSArray *)devicesWithMediaType:(NSString *)mediaType;
得到某人制定类型的设备
+ (AVCaptureDevice *)defaultDeviceWithMediaType:(NSString *)mediaType;
得到指定ID类型的设备
+ (AVCaptureDevice *)deviceWithUniqueID:(NSString *)deviceUniqueID;
获取媒体的授权状态
+ (AVAuthorizationStatus)authorizationStatusForMediaType:(NSString *)mediaType;
为媒体请求用户的权限
+ (void)requestAccessForMediaType:(NSString *)mediaType completionHandler:(void(^)(BOOL granted))handler;
请求调节硬件配置的权限
- (BOOL)lockForConfiguration:(NSError **)outError;
放弃调节硬件配置的权限
- (void)unlockForConfiguration;
是否允许调节焦点模式
- (BOOL)isFocusModeSupported:(AVCaptureFocusMode)focusMode;

   AVCaptureFocusModeLocked      关闭对焦

   AVCaptureFocusModeAutoFocus   自动对焦

   AVCaptureFocusModeContinuousAutoFocus  自动连续对焦`

对焦模式

@property(nonatomic) AVCaptureFocusMode focusMode;

是否允许设置自己感兴趣的焦点
@property(nonatomic, readonly, getter=isFocusPointOfInterestSupported) BOOLfocusPointOfInterestSupported;

自己感兴趣的对焦点

@property(nonatomic) CGPoint focusPointOfInterest;

是否允许调节焦点

@property(nonatomic, readonly, getter=isAdjustingFocus) BOOL adjustingFocus;

自动对焦的范围是否有限制

@property(nonatomic, readonly, getter=isAutoFocusRangeRestrictionSupported)BOOL autoFocusRangeRestrictionSupported;

自动对焦的区域限制

@property(nonatomic) AVCaptureAutoFocusRangeRestrictionautoFocusRangeRestriction;

 AVCaptureAutoFocusRangeRestrictionNone  没有限制

 AVCaptureAutoFocusRangeRestrictionNear   近处

 AVCaptureAutoFocusRangeRestrictionFar    远处

是否支持平滑对焦

@property(nonatomic, readonly, getter=isSmoothAutoFocusSupported) BOOLsmoothAutoFocusSupported NS_AVAILABLE_IOS(7_0);

是否允许平滑对焦

@property(nonatomic, getter=isSmoothAutoFocusEnabled) BOOLsmoothAutoFocusEnabled NS_AVAILABLE_IOS(7_0);

曝光调节

是否允许调节曝光

@property(nonatomic,readonly, getter=isAdjustingExposure) BOOL adjustingExposure

曝光模式

@property(nonatomic)AVCaptureExposureMode exposureMode

 AVCaptureExposureModeLocked  锁定曝光

 AVCaptureExposureModeAutoExpose   自动曝光

 AVCaptureExposureModeContinuousAutoExposure    自动持续曝光

 AVCaptureExposureModeCustom    自定义曝光

曝光模式是否支持

-(BOOL)isExposureModeSupported:(AVCaptureExposureMode)exposureMode

感兴趣的曝光点

@property(nonatomic)CGPoint exposurePointOfInterest

是否支持感兴趣的曝光点调节

@property(nonatomic,readonly, getter=isExposurePointOfInterestSupported) BOOLexposurePointOfInterestSupported

是否支持白平衡模式

-(BOOL)isWhiteBalanceModeSupported:(AVCaptureWhiteBalanceMode)whiteBalanceMode

 AVCaptureWhiteBalanceModeLocked           锁定

 AVCaptureWhiteBalanceModeAutoWhiteBalance  自动白平衡

 AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance 自动持续白平衡```
 白平衡模式
 `@property(nonatomic)AVCaptureWhiteBalanceMode whiteBalanceMode`

 是否允许调节白平衡

` @property(nonatomic,readonly, getter=isAdjustingWhiteBalance) BOOL adjustingWhiteBalance`

 //

 `@property(nonatomic)CGFloat videoZoomFactor`

 //
` -(void)rampToVideoZoomFactor:(CGFloat)factor
 withRate:(float)rate`
 //
 `-(void)cancelVideoZoomRamp`
 //
` @property(nonatomic,readonly, getter=isRampingVideoZoom) BOOL rampingVideoZoom`
   ##闪光灯设置

设备是否有闪光灯
 `@property(nonatomic,readonly) BOOL hasFlash`
   //闪光灯模式
` @property(nonatomic)AVCaptureFlashMode flashMode`

 ```objc
 AVCaptureFlashModeOff     关
 AVCaptureFlashModeOn     开
 AVCaptureFlashModeAuto   自动```
  是否支持设定的闪光灯模式
` -(BOOL)isFlashModeSupported:(AVCaptureFlashMode)flashMode`
当前闪光灯是否处于活动状态
` @property(nonatomic,readonly, getter=isFlashActive) BOOL flashActive`
   当前闪光灯是否处于可用状态
` @property(nonatomic,readonly, getter=isFlashAvailable) BOOL flashAvailable`
  ##手电筒设置

   当前设备是否有手电筒

` @property(nonatomic,readonly) BOOL hasTorch`

   手电筒是否可用
 `@property(nonatomic,readonly, getter=isTorchAvailable) BOOL torchAvailable`

   手电筒是否处于活动状态

` @property(nonatomic,readonly, getter=isTorchActive) BOOL torchActive`

 

   手电筒亮度调节

` @property(nonatomic,readonly) float torchLevel`

 

   手电筒模式

` -(BOOL)isTorchModeSupported:(AVCaptureTorchMode)torchMode`

 

  ```objc
   AVCaptureTorchModeOff    关

   AVCaptureTorchModeOn     开

   AVCaptureTorchModeAuto   自动```

 

   调节手电筒的亮度

 ` -(BOOL)setTorchModeOnWithLevel:(float)torchLevel
 error:(NSError**)outError`

 
  
##低亮度设置
  是否支持低亮度下提高亮度

` @property(nonatomic,readonly, getter=isLowLightBoostSupported) BOOL lowLightBoostSupported`

 

   是否允许低亮度调节

` @property(nonatomic,readonly, getter=isLowLightBoostEnabled) BOOL lowLightBoostEnabled`

 

   自动允许低亮状态下提高亮度

` @property(nonatomic)BOOL automaticallyEnablesLowLightBoostWhenAvailable`
##屏幕比率设置
   最小屏幕的持续时间

` @property(nonatomic)CMTime activeVideoMinFrameDuration`

 

   最大屏幕的持续时间

 `@property(nonatomic)CMTime activeVideoMaxFrameDuration`

 

 
##监测区域的改变

   是否允许监视区域的改变，便于重新聚焦 调节白平衡，调节曝光等

 `@property(nonatomic,getter=isSubjectAreaChangeMonitoringEnabled) BOOLsubjectAreaChangeMonitoringEnabled`

 
##检查设备的特性

 

   当前设备是否连接

` @property(nonatomic,readonly, getter=isConnected) BOOL connected`

 

当前设备的位置

` @property(nonatomic,readonly) AVCaptureDevicePosition position`

 

 ```objc
 AVCaptureDevicePositionUnspecified  未制定

 AVCaptureDevicePositionBack        后

 AVCaptureDevicePositionFront      前```

 

   判断当前设备是否有给定的媒体类型

 `-(BOOL)hasMediaType:(NSString *)mediaType`

 

   modelID  所有设备相同model的不同ID

 `@property(nonatomic,readonly) NSString *modelID`

   设备的本地名字

 `@property(nonatomic,readonly) NSString *localizedName`

 

   uniqueID

 `@property(nonatomic,readonly) NSString *uniqueID`

 

   是否允许捕捉期间预先设置参数

` -(BOOL)supportsAVCaptureSessionPreset:(NSString *)preset`

 

   镜头的光圈 （只读）

` @property(nonatomic,readonly) float lensAperture`

 
 ##镜头的位置
 镜头的位置（只读）

 `@property(nonatomic,readonly) float lensPosition`

 

 调节镜头的位置

` -(void)setFocusModeLockedWithLensPosition:(float)lensPosition
 completionHandler:(void(^)(CMTime syncTime))handler`

图像曝光

   曝光时长（只读）
` @property(nonatomic,readonly) CMTime exposureDuration`

 

   调解自定义曝光模式和时长

 `-(void)setExposureModeCustomWithDuration:(CMTime)duration
 ISO:(float)ISO completionHandler:(void(^)(CMTime syncTime))handler`

 

   曝光的偏移量

` @property(nonatomic,readonly) float exposureTargetOffset`

 

   曝光目标的倾斜

` @property(nonatomic,readonly) float exposureTargetBias`

 最大的倾斜
 `@property(nonatomic,readonly) float maxExposureTargetBias`

 最小的倾斜
` @property(nonatomic,readonly) float maxExposureTargetBias`

 调节曝光倾斜
 `-(void)setExposureTargetBias:(float)bias
 completionHandler:(void(^)(CMTime syncTime))handler`
##白平衡

  白平衡色度调节

`-(AVCaptureWhiteBalanceChromaticityValues)chromaticityValuesForDeviceWhiteBalanceGains:(AVCaptureWhiteBalanceGains)whiteBalanceGains`

 

   获取白平衡增益
` @property(nonatomic,readonly) AVCaptureWhiteBalanceGains deviceWhiteBalanceGains`
   最大的白平衡增益
 `@property(nonatomic,readonly) float maxWhiteBalanceGain`
   设备的白平衡色彩度
 `-(AVCaptureWhiteBalanceGains)deviceWhiteBalanceGainsForChromaticityValues:(AVCaptureWhiteBalanceChromaticityValues)chromaticityValues`


   温度和色彩度的白平衡调节
`-(AVCaptureWhiteBalanceGains)deviceWhiteBalanceGainsForTemperatureAndTintValues:(AVCaptureWhiteBalanceTemperatureAndTintValues)tempAndTintValues`

 //
` @property(nonatomic,readonly) AVCaptureWhiteBalanceGains grayWorldDeviceWhiteBalanceGains`

 //
`-(void)setWhiteBalanceModeLockedWithDeviceWhiteBalanceGains:(AVCaptureWhiteBalanceGains)whiteBalanceGains
completionHandler:(void(^)(CMTime syncTime))handler` 

 // `-(AVCaptureWhiteBalanceTemperatureAndTintValues)temperatureAndTintValuesForDeviceWhiteBalanceGains:(AVCaptureWhiteBalanceGains)whiteBalanceGains`

 

##ISO
   曝光的ISO值
 `@property(nonatomic,readonly) float ISO`
##HDR
 

  是否允许自动调节HDR
`@property(nonatomic)BOOL automaticallyAdjustsVideoHDREnabled`
 是否允许HDR调节
` @property(nonatomic,getter=isVideoHDREnabled) BOOL videoHDREnabled`
 
 ##常量

```objc
 AVCaptureDevicePositionUnspecified = 0, 未规定
 AVCaptureDevicePositionBack  = 1,   后
 AVCaptureDevicePositionFront = 2   前

 AVCaptureFlashModeOff    = 0, 闪光灯关
 AVCaptureFlashModeOn     = 1, 闪光灯开
 AVCaptureFlashModeAuto   = 2  自动

 AVCaptureTorchModeOff    = 0, 手电筒关
 AVCaptureTorchModeOn     = 1, 手电筒开
 AVCaptureTorchModeAuto   = 2  手电筒自动

 const float AVCaptureMaxAvailableTorchLevel  手电筒最大亮度

 AVCaptureFocusModeLocked               = 0, 不对焦
 AVCaptureFocusModeAutoFocus            = 1,  自动对焦
 AVCaptureFocusModeContinuousAutoFocus   = 2,  持续对焦

 AVCaptureExposureModeLocked                   = 0, 不曝光
 AVCaptureExposureModeAutoExpose               = 1, 自动曝光
 AVCaptureExposureModeContinuousAutoExposure    = 2, 持续曝光
 AVCaptureExposureModeCustom                   = 3, 自定义曝光

 AVCaptureWhiteBalanceModeLocked            = 0,  关闭拍平衡模式
 AVCaptureWhiteBalanceModeAutoWhiteBalance   = 1, 自动白平衡
 AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance = 2, 持续拍平衡

 AVAuthorizationStatusNotDetermined = 0, 授权状态不确定
 AVAuthorizationStatusRestricted,   受限制的授权状态
 AVAuthorizationStatusDenied,       无权访问
 AVAuthorizationStatusAuthorized    授权

 AVCaptureAutoFocusRangeRestrictionNone = 0, 自动对焦区域无限制
 AVCaptureAutoFocusRangeRestrictionNear = 1, 近
 AVCaptureAutoFocusRangeRestrictionFar  = 2, 远

 const AVCaptureWhiteBalanceGainsAVCaptureWhiteBalanceGainsCurrent; 当前白平衡增益
 const float AVCaptureLensPositionCurrent  当前镜头位置
 const float AVCaptureISOCurrent 当前ISO
 const float AVCaptureExposureTargetBiasCurrent 当前曝光倾斜
 const CMTime AVCaptureExposureDurationCurrent; 当前曝光时间
 
 通知Notifications
 AVCaptureDeviceWasConnectedNotification  已连接通知
 AVCaptureDeviceWasDisconnectedNotification 未连接通知
 AVCaptureDeviceSubjectAreaDidChangeNotification 区域改变通知```
[原文连接](http://blog.csdn.net/qq_34353990/article/details/51547400)