ios/Timi/Class/Base/Utils/ScanController/ScanQRCodeViewController.m

//
//  ScanQRCodeViewController.m
//  MIT_Shop
//
//  Created by 翟玉磊 on 2017/11/18.
//  Copyright © 2017年 翟玉磊. All rights reserved.
//

#import "ScanQRCodeViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
#import "LWQRCodeBackgroundView.h"
#import "LWQRCodeScanView.h"

#define ScanY 150           //扫描区域y
#define ScanWidth 250       //扫描区域宽度
#define ScanHeight 250      //扫描区域高度

@interface ScanQRCodeViewController ()<AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

@property(nonatomic,strong)AVCaptureDevice *device;//创建相机
@property(nonatomic,strong)AVCaptureDeviceInput *input;//创建输入设备
@property(nonatomic,strong)AVCaptureMetadataOutput *output;//创建输出设备
@property(nonatomic,strong)AVCaptureSession *session;//创建捕捉类
@property(strong,nonatomic)AVCaptureVideoPreviewLayer *preview;//视觉输出预览层
@property(strong,nonatomic)LWQRCodeScanView *scanView;
@end

@implementation ScanQRCodeViewController

- (void)dealloc
{
    self.device = nil;
    [self.session stopRunning];
    self.session = nil;
    self.input = nil;
    self.output = nil;
    self.preview = nil;
    [self.scanView stopAnimaion];
    self.scanView = nil;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title = @"二维码/条码";
    
    [self capture];
    [self UI];
}

#pragma mark - 初始化UI
- (void)UI
{
    self.view.backgroundColor = [UIColor whiteColor];
    //扫描区域
    CGRect scanFrame = CGRectMake((SCREEN_WIDTH-ScanWidth)/2, ScanY, ScanWidth, ScanHeight);
    
    // 创建view,用来辅助展示扫描的区域
    self.scanView = [[LWQRCodeScanView alloc] initWithFrame:scanFrame];
    [self.view addSubview:self.scanView];
    
    //扫描区域外的背景
    LWQRCodeBackgroundView *qrcodeBackgroundView = [[LWQRCodeBackgroundView alloc] initWithFrame:self.view.bounds];
    qrcodeBackgroundView.scanFrame = scanFrame;
    [self.view addSubview:qrcodeBackgroundView];
    
    //提示文字
    UILabel *label = [UILabel new];
    label.text = @"将二维码/条形码放入框内，即可自动扫描";
    label.textAlignment = NSTextAlignmentCenter;
    label.font = [UIFont systemFontOfSize:15];
    label.textColor = [UIColor colorWithRed:224/255.0 green:224/255.0 blue:224/255.0 alpha:1.0];
    label.frame = CGRectMake(0, CGRectGetMaxY(self.scanView.frame)+10, SCREEN_WIDTH, 20);
    [self.view addSubview:label];
    
    
    //灯光和相册
    NSArray *arr = @[@"灯光",@"相册"];
    for (int i = 0; i < 2; i++) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        [btn setTitle:arr[i] forState:UIControlStateNormal];
        btn.tag = i;
        btn.backgroundColor = [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.5];
        btn.frame = CGRectMake(SCREEN_WIDTH/2*i, SCREEN_HEIGHT- 50 - HOME_INDICATOR_HEIGHT, SCREEN_WIDTH/2, 50);
        [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
    }
}

#pragma mark - 菜单按钮点击事件
- (void)btnClick:(UIButton *)sender
{
    if (sender.tag == 0) {
        Class capture = NSClassFromString(@"AVCaptureDevice");
        if (capture != nil) {
            if ([self.device hasTorch] && [self.device hasFlash]) {
                [self.device lockForConfiguration:nil];
                
                sender.selected = !sender.selected;
                
                if (sender.selected) {
                    [self.device setTorchMode:AVCaptureTorchModeOn];
                    [self.device setFlashMode:AVCaptureFlashModeOn];
                } else {
                    [self.device setTorchMode:AVCaptureTorchModeOff];
                    [self.device setFlashMode:AVCaptureFlashModeOff];
                }
                [self.device unlockForConfiguration];
            }
        }
    } else {
        
        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){
            UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];
            imagePicker.allowsEditing = YES;
            imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
            imagePicker.delegate = self;
            [self presentViewController:imagePicker animated:YES completion:^{
                NSLog(@"打开相册");
            }];
        }else{
            NSLog(@"不能打开相册");
        }
    }
}

#pragma mark - 从相册选择识别二维码
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    //获取选中的照片
    UIImage *image = info[UIImagePickerControllerEditedImage];
    
    if (!image) {
        image = info[UIImagePickerControllerOriginalImage];
    }
    //初始化  将类型设置为二维码
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:nil];
    
    [picker dismissViewControllerAnimated:YES completion:^{
        
        //扫描成功播放音效
        [self playSoundEffect:@"Qcodesound.caf"];
        
        //设置数组，放置识别完之后的数据
        NSArray *features = [detector featuresInImage:[CIImage imageWithData:UIImagePNGRepresentation(image)]];
        //判断是否有数据（即是否是二维码）
        if (features.count >= 1) {
            //取第一个元素就是二维码所存放的文本信息
            CIQRCodeFeature *feature = features[0];
            NSString *scannedResult = feature.messageString;
            
            //扫描结果回调
            if (self->_delegate && [self->_delegate respondsToSelector:@selector(scanCompletionCallbackWithText:ScanQRCodeViewController:)]) {
                
                [self.session startRunning];
                [self.scanView startAnimaion];
                
                [self->_delegate scanCompletionCallbackWithText:scannedResult ScanQRCodeViewController:self];
             
//                [self.navigationController popViewControllerAnimated:YES];
            }
        }else{
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"扫描结果"
                                                            message:@"不是二维码/条码图片"
                                                           delegate:self
                                                  cancelButtonTitle:nil
                                                  otherButtonTitles:@"确定", nil];
            [self.view addSubview:alert];
            [alert show];
        }
    }];
    
}

//进入拍摄页面点击取消按钮
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [self dismissViewControllerAnimated:YES completion:nil];
}

#pragma mark - 初始化扫描设备
- (void)capture
{
    //如果是模拟器返回（模拟器获取不到摄像头）
    if (TARGET_IPHONE_SIMULATOR) {
        return;
    }
    
    // 下面的是比较重要的,也是最容易出现崩溃的原因,就是我们的输出流的类型
    // 1.这里可以设置多种输出类型,这里必须要保证session层包括输出流
    // 2.必须要当前项目访问相机权限必须通过,所以最好在程序进入当前页面的时候进行一次权限访问的判断
    
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if(authStatus ==AVAuthorizationStatusRestricted|| authStatus ==AVAuthorizationStatusDenied){
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"请在iPhone的“设置”-“隐私”-“相机”功能中，找到“某某应用”打开相机访问权限" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
        [alert show];
        return;
    }
    
    //初始化基础"引擎"Device
    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //初始化输入流 Input,并添加Device
    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    //初始化输出流Output
    self.output = [[AVCaptureMetadataOutput alloc] init];
    
    //设置输出流的相关属性
    // 确定输出流的代理和所在的线程,这里代理遵循的就是上面我们在准备工作中提到的第一个代理,至于线程的选择,建议选在主线程,这样方便当前页面对数据的捕获.
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    //设置扫描区域的大小 rectOfInterest  默认值是CGRectMake(0, 0, 1, 1) 按比例设置
    self.output.rectOfInterest = CGRectMake(ScanY/SCREEN_HEIGHT,((SCREEN_WIDTH-ScanWidth)/2)/SCREEN_WIDTH,ScanHeight/SCREEN_HEIGHT,ScanWidth/SCREEN_WIDTH);
    
    /*
     // AVCaptureSession 预设适用于高分辨率照片质量的输出
     AVF_EXPORT NSString *const AVCaptureSessionPresetPhoto NS_AVAILABLE(10_7, 4_0) __TVOS_PROHIBITED;
     // AVCaptureSession 预设适用于高分辨率照片质量的输出
     AVF_EXPORT NSString *const AVCaptureSessionPresetHigh NS_AVAILABLE(10_7, 4_0) __TVOS_PROHIBITED;
     // AVCaptureSession 预设适用于中等质量的输出。 实现的输出适合于在无线网络共享的视频和音频比特率。
     AVF_EXPORT NSString *const AVCaptureSessionPresetMedium NS_AVAILABLE(10_7, 4_0) __TVOS_PROHIBITED;
     // AVCaptureSession 预设适用于低质量的输出。为了实现的输出视频和音频比特率适合共享 3G。
     AVF_EXPORT NSString *const AVCaptureSessionPresetLow NS_AVAILABLE(10_7, 4_0) __TVOS_PROHIBITED;
     */
    
    // 初始化session
    self.session = [[AVCaptureSession alloc]init];
    // 设置session类型,AVCaptureSessionPresetHigh 是 sessionPreset 的默认值。
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    
    //将输入流和输出流添加到session中
    // 添加输入流
    if ([_session canAddInput:self.input]) {
        [_session addInput:self.input];
    }
    // 添加输出流
    if ([_session canAddOutput:self.output]) {
        [_session addOutput:self.output];
        
        //扫描格式
        NSMutableArray *metadataObjectTypes = [NSMutableArray array];
        [metadataObjectTypes addObjectsFromArray:@[
                                                   AVMetadataObjectTypeQRCode,
                                                   AVMetadataObjectTypeEAN13Code,
                                                   AVMetadataObjectTypeEAN8Code,
                                                   AVMetadataObjectTypeCode128Code,
                                                   AVMetadataObjectTypeCode39Code,
                                                   AVMetadataObjectTypeCode93Code,
                                                   AVMetadataObjectTypeCode39Mod43Code,
                                                   AVMetadataObjectTypePDF417Code,
                                                   AVMetadataObjectTypeAztecCode,
                                                   AVMetadataObjectTypeUPCECode,
                                                   ]];
        
        // >= ios 8
        if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1) {
            [metadataObjectTypes addObjectsFromArray:@[AVMetadataObjectTypeInterleaved2of5Code,
                                                       AVMetadataObjectTypeITF14Code,
                                                       AVMetadataObjectTypeDataMatrixCode]];
        }
        //设置扫描格式
        self.output.metadataObjectTypes= metadataObjectTypes;
    }
    
    
    //设置输出展示平台AVCaptureVideoPreviewLayer
    // 初始化
    self.preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
    // 设置Video Gravity,顾名思义就是视频播放时的拉伸方式,默认是AVLayerVideoGravityResizeAspect
    // AVLayerVideoGravityResizeAspect 保持视频的宽高比并使播放内容自动适应播放窗口的大小。
    // AVLayerVideoGravityResizeAspectFill 和前者类似，但它是以播放内容填充而不是适应播放窗口的大小。最后一个值会拉伸播放内容以适应播放窗口.
    // 因为考虑到全屏显示以及设备自适应,这里我们采用fill填充
    self.preview.videoGravity =AVLayerVideoGravityResizeAspectFill;
    // 设置展示平台的frame
    self.preview.frame = CGRectMake(0, 0, SCREEN_WIDTH, VIEW_BOUNDS_HEIGHT);
    // 因为 AVCaptureVideoPreviewLayer是继承CALayer,所以添加到当前view的layer层
    [self.view.layer insertSublayer:self.preview atIndex:0];
    
    //开始
    [self.session startRunning];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    
    [self.session stopRunning];
    [self.scanView stopAnimaion];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    [self.session startRunning];
    [self.scanView startAnimaion];
}

- (void)startAnimaion {
    
    [self.session startRunning];
    [self.scanView startAnimaion];
}

#pragma mark - AVCaptureMetadataOutputObjectsDelegate
#pragma mark - 扫描结果处理
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    //扫描成功播放音效
    [self playSoundEffect:@"Qcodesound.caf"];
    
    // 判断扫描结果的数据是否存在
    if ([metadataObjects count] >0){
        // 如果存在数据,停止扫描
        [self.session stopRunning];
        [self.scanView stopAnimaion];
        // AVMetadataMachineReadableCodeObject是AVMetadataObject的具体子类定义的特性检测一维或二维条形码。
        // AVMetadataMachineReadableCodeObject代表一个单一的照片中发现机器可读的代码。这是一个不可变对象描述条码的特性和载荷。
        // 在支持的平台上,AVCaptureMetadataOutput输出检测机器可读的代码对象的数组
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        // 获取扫描到的信息
        NSString *stringValue = metadataObject.stringValue;
        
        //扫描结果回调
        if (_delegate && [_delegate respondsToSelector:@selector(scanCompletionCallbackWithText: ScanQRCodeViewController:)]) {
            
            [_delegate scanCompletionCallbackWithText:stringValue ScanQRCodeViewController:self];
        }
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"扫描结果"
                                                        message:@"不是二维码/条码图片"
                                                       delegate:self
                                              cancelButtonTitle:nil
                                              otherButtonTitles:@"确定", nil];
        [self.view addSubview:alert];
        [alert show];
    }
}

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
    [self.session startRunning];
    [self.scanView startAnimaion];
}

#pragma mark - - - 扫描提示声
/** 播放音效文件 */
- (void)playSoundEffect:(NSString *)name{
    // 获取音效
    NSString *audioFile = [[NSBundle mainBundle] pathForResource:name ofType:nil];
    NSURL *fileUrl = [NSURL fileURLWithPath:audioFile];
    
    // 1、获得系统声音ID
    SystemSoundID soundID = 0;
    
    AudioServicesCreateSystemSoundID((__bridge CFURLRef)(fileUrl), &soundID);
    
    // 如果需要在播放完之后执行某些操作，可以调用如下方法注册一个播放完成回调函数
    AudioServicesAddSystemSoundCompletion(soundID, NULL, NULL, scanSoundCompleteCallback, NULL);
    
    // 2、播放音频
    AudioServicesPlaySystemSound(soundID); // 播放音效
}

/**
 *  播放完成回调函数
 *
 *  @param soundID    系统声音ID
 *  @param clientData 回调时传递的数据
 */
void scanSoundCompleteCallback(SystemSoundID soundID, void *clientData){
    NSLog(@"播放完成...");
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end