AVCaptureDevice的几个属性

lz最近发现二维码很是好玩，虽然之前写过zing和zbar的，但是那都是苹果让程序必须支持64位之前的事了，所以我就决定研究下苹果自带的二维码扫描以及生成，之前为了一个处女座需求查了好多资料，也在微博求助了好多大牛，但是基本没有一个搭理我，所以更加激励我，于是乎我就从最根本的开始研究。这几天终于有眉目了，这里贴出打开摄像头相关的一些设置，之后会有更新以及github的我写的利用系统库进行二维码的扫描与生成，避免了添加第三方库的繁琐和工程文件过大的烦恼。希望大家共同进步。

AVCaptureDevice.h 主要用来获取iPhone一些关于相机设备的属性。
必须引用一个系统包：#import

1.前置和后置摄像头
typedef NS_ENUM(NSInteger, AVCaptureDevicePosition) {
AVCaptureDevicePositionUnspecified = 0,
AVCaptureDevicePositionBack = 1,
AVCaptureDevicePositionFront = 2
} NS_AVAILABLE(10_7, 4_0);

2.闪光灯开关
typedef NS_ENUM(NSInteger, AVCaptureFlashMode) {
AVCaptureFlashModeOff = 0,
AVCaptureFlashModeOn = 1,
AVCaptureFlashModeAuto = 2

} NS_AVAILABLE(10_7, 4_0);

3.手电筒开关--其实就是相机的闪光灯
typedef NS_ENUM(NSInteger, AVCaptureTorchMode) {
AVCaptureTorchModeOff = 0,
AVCaptureTorchModeOn = 1,
AVCaptureTorchModeAuto = 2,

} NS_AVAILABLE(10_7, 4_0);

4.焦距模式调整
typedef NS_ENUM(NSInteger, AVCaptureFocusMode) {
AVCaptureFocusModeLocked = 0,
AVCaptureFocusModeAutoFocus = 1,
AVCaptureFocusModeContinuousAutoFocus = 2,

} NS_AVAILABLE(10_7, 4_0);

5.曝光量调节
typedef NS_ENUM(NSInteger, AVCaptureExposureMode) {
AVCaptureExposureModeLocked = 0,
AVCaptureExposureModeAutoExpose = 1,
AVCaptureExposureModeContinuousAutoExposure = 2,
AVCaptureExposureModeCustom NS_ENUM_AVAILABLE_IOS(8_0) = 3,

} NS_AVAILABLE(10_7, 4_0);

6.白平衡
typedef NS_ENUM(NSInteger, AVCaptureWhiteBalanceMode) {
AVCaptureWhiteBalanceModeLocked = 0,
AVCaptureWhiteBalanceModeAutoWhiteBalance = 1,
AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance = 2,

} NS_AVAILABLE(10_7, 4_0);

7.距离调整
typedef NS_ENUM(NSInteger, AVCaptureAutoFocusRangeRestriction) {
AVCaptureAutoFocusRangeRestrictionNone = 0,
AVCaptureAutoFocusRangeRestrictionNear = 1,
AVCaptureAutoFocusRangeRestrictionFar = 2,

} NS_AVAILABLE_IOS(7_0);