klx_teacher/KulexiuForTeacher/KulexiuForTeacher/Common/Tools/Custom/GRScanManager.m

//
//  GRCodeManager.m
//  GreenRoad
//
//  Created by Vecige on 16/11/17.
//  Copyright © 2016年  jetsum. All rights reserved.
//

#import "GRScanManager.h"
#import <AVFoundation/AVFoundation.h>
#import <AudioToolbox/AudioToolbox.h>

@interface GRScanManager()<AVCaptureMetadataOutputObjectsDelegate>

@property (copy, nonatomic) void (^completionBlock) (NSString *);

@property (nonatomic, strong) AVCaptureSession *session;

@property (nonatomic, strong) dispatch_queue_t sessionQueue;


@end

@implementation GRScanManager

- (instancetype)init {
    self = [super init];
    if (self) {
        _supportQRCode = YES;
        _supportBarCode = YES;
        [self createQueue];
    }
    return self;
}

/**
 *  创建一个队列,防止阻塞主线程
 */
- (void)createQueue{
    dispatch_queue_t sessionQueue = dispatch_queue_create("com.Colexiu.KulexiuForStudent.sesson", DISPATCH_QUEUE_SERIAL);
    self.sessionQueue = sessionQueue;
}


#pragma mark - 扫描二维码
#pragma mark 开始扫描
- (void)startScanningQRCodeWithInView:(UIView *)inView scanView:(UIView *)scanView resultCallback:(void(^)(NSString *result))callback {
    
    if ([self.session isRunning]) {
        [self.session stopRunning];
        self.session = nil;
    }
    
    // 0.保存block
    self.completionBlock = callback;
    
    // 1.创建输入
    // 1.1.定义错误
    NSError *error = nil;
    
    // 1.2.获取摄像头
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    if ([device respondsToSelector:@selector(setVideoZoomFactor:)]) {
        if ([ device lockForConfiguration:nil]) {
            //            float zoomFactor = device.activeFormat.videoZoomFactorUpscaleThreshold;
            float zoomFactor = 2.0;
            [device setVideoZoomFactor:zoomFactor];
            [device unlockForConfiguration];
        }
    }
    
    // 1.3.创建输入
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
    if (error != nil) {
        return;
    }
    
    // 2.创建输出
    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    // 3.创建捕捉会话
    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    [session addInput:input];
    [session addOutput:output];
    
    self.session = session;
    
    // 4.设置输入的内容类型
    //    [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
//    [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]];
    NSMutableArray *types = [NSMutableArray array];
    if (self.supportQRCode) {
        [types addObject:AVMetadataObjectTypeQRCode];
    }
    if (self.supportBarCode) {
        [types addObjectsFromArray:@[AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]];
    }
    [output setMetadataObjectTypes:[types copy]];
    // 5.添加预览图层(让用户看到扫描的界面)
    // 5.1.创建图层
    AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    // 5.2.设置的layer的frame
    previewLayer.frame = inView.bounds;

    inView.clipsToBounds = YES;
    inView.layer.masksToBounds = YES;
    scanView.clipsToBounds = YES;
    scanView.layer.masksToBounds = YES;
    // 5.3.将图层添加到其它图层中
    [inView.layer insertSublayer:previewLayer below:scanView.layer];
    [previewLayer setAffineTransform:CGAffineTransformMakeScale(2.0, 2.0)];

    // 6.设置扫描区域
    CGSize screenSize = [UIScreen mainScreen].bounds.size;
    CGFloat x = scanView.frame.origin.y / screenSize.height;
    CGFloat y = scanView.frame.origin.x / screenSize.width;
    CGFloat w = scanView.frame.size.height / screenSize.height;
    CGFloat h = scanView.frame.size.width / screenSize.width;
    output.rectOfInterest = CGRectMake(x, y, w, h);
    
    // 7.开始扫描
    [self sessionStartRunning];
}
- (void)sessionStartRunning {
    
    @weakObj(self);
    dispatch_async(self.sessionQueue, ^{
        @strongObj(self);
        if (!self.session.running) {
            [self.session startRunning];
        }
    });
}

-(void)sessionStopRunning{
    
    @weakObj(self);
    dispatch_async(self.sessionQueue, ^{
        @strongObj(self);
        if (self.session.running) {
            [self.session stopRunning];
        }
    });
}

#pragma mark - 实现AVCaptureMetadataOutput代理方法
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
    // 1.遍历结果
    
    for (AVMetadataMachineReadableCodeObject *result in metadataObjects) {
        NSString *scannedResult = [(AVMetadataMachineReadableCodeObject *) result stringValue];
        [self addwarningtone];
       BLOCK_EXEC(_completionBlock,scannedResult);
//                [self stopScanning];
        break;
    }
}

#pragma mark 给扫描结果添加提示音
-(void)addwarningtone{
    SystemSoundID soundID = 1000;
    AudioServicesPlaySystemSound(soundID);
    AudioServicesPlayAlertSound(soundID);
}


+ (BOOL)isAvailable
{
    @autoreleasepool {
        AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        
        if (!captureDevice) {
            return NO;
        }
        
        NSError *error;
        AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
        
        if (!deviceInput || error) {
            return NO;
        }
        
        return YES;
    }
}


+ (BOOL)supportsMetadataObjectTypes:(NSArray *)metadataObjectTypes
{
    if (![self isAvailable]) {
        return NO;
    }
    
    @autoreleasepool {
        // Setup components
        AVCaptureDevice *captureDevice    = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
        AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:nil];
        AVCaptureMetadataOutput *output   = [[AVCaptureMetadataOutput alloc] init];
        AVCaptureSession *session         = [[AVCaptureSession alloc] init];
        
        [session addInput:deviceInput];
        [session addOutput:output];
        
        if (metadataObjectTypes == nil || metadataObjectTypes.count == 0) {
            // Check the QRCode metadata object type by default
            metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
        }
        
        for (NSString *metadataObjectType in metadataObjectTypes) {
            if (![output.availableMetadataObjectTypes containsObject:metadataObjectType]) {
                return NO;
            }
        }
        
        return YES;
    }
}

- (void)stopScanning {
    [self sessionStopRunning];
}

@end