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)
