AVCaptureDevice主要用來獲取iPhone一些關(guān)于相機(jī)設(shè)備的相關(guān)屬性。
必須引用一個AVFoundation框架：
//#import <AVFoundation/AVFoundation.h>
1.前置和后置攝像頭
typedef NS_ENUM(NSInteger, AVCaptureDevicePosition) {
AVCaptureDevicePositionUnspecified = 0,
AVCaptureDevicePositionBack = 1,
AVCaptureDevicePositionFront = 2
} NS_AVAILABLE(10_7, 4_0);
2.閃光燈開關(guān)
typedef NS_ENUM(NSInteger, AVCaptureFlashMode) {
AVCaptureFlashModeOff = 0,
AVCaptureFlashModeOn = 1,
AVCaptureFlashModeAuto = 2
} NS_AVAILABLE(10_7, 4_0);
3.手電筒開關(guān)--其實就是相機(jī)的閃光燈
typedef NS_ENUM(NSInteger, AVCaptureTorchMode) {
AVCaptureTorchModeOff = 0,
AVCaptureTorchModeOn = 1,
AVCaptureTorchModeAuto = 2,
} NS_AVAILABLE(10_7, 4_0);
4.焦距模式調(diào)整
typedef NS_ENUM(NSInteger, AVCaptureFocusMode) {
AVCaptureFocusModeLocked = 0,
AVCaptureFocusModeAutoFocus = 1,
AVCaptureFocusModeContinuousAutoFocus = 2,
} NS_AVAILABLE(10_7, 4_0);
5.曝光量調(diào)節(jié)
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.距離調(diào)整
typedef NS_ENUM(NSInteger, AVCaptureAutoFocusRangeRestriction) {
AVCaptureAutoFocusRangeRestrictionNone = 0,
AVCaptureAutoFocusRangeRestrictionNear = 1,
AVCaptureAutoFocusRangeRestrictionFar = 2,
} NS_AVAILABLE_IOS(7_0);
下面簡單實現(xiàn)以下手電筒的如何開啟和關(guān)閉鸦概，為了簡單起見箩张，我們就借助touchesBegan方法操作，通過觸摸屏幕開啟和關(guān)閉手電筒
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
@property (nonatomic, strong) AVCaptureDevice *device;
@property (nonatomic,assign) BOOL lightOn;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
/**
* hasTorch :返回YES表名手機(jī)上有手電筒
*/
if (![_device hasTorch]) {
NSLog(@"手電筒壞了");
return;
}
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
_lightOn = !_lightOn;
//根據(jù)ligthOn狀態(tài)判斷打開還是關(guān)閉
if (_lightOn) {
//開啟手電筒
[_device lockForConfiguration:nil];
[_device setTorchMode:AVCaptureTorchModeOn];
[_device unlockForConfiguration];
}else{
//關(guān)閉手電筒
[_device lockForConfiguration:nil];
[_device setTorchMode:AVCaptureTorchModeOff];
[_device unlockForConfiguration];
}
}
@end
