二维码：ZBarReaderViewController

二维码扫描思路：获取二维码内部信息 + 处理刚刚获取到的内部信息

优点：二维码+条形码

头文件：`#import "ZBarSDK.h"`

info.plist文件配置：


NSCameraUsageDescription
APP需要您的同意,才能访问相机

参《iOS10之后权限设置》

宏定义：#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width) //屏宽

A.直接使用ZBarReaderViewController：

协议：ZBarReaderDelegate

当前视图控制器中，添加一个按钮。点击跳到下一个界面：

UIButton * btn = [[UIButton alloc] initWithFrame:CGRectMake(30,70, 150,35)];
btn.backgroundColor = [UIColor lightGrayColor];
[btn setTitle:@"点击，扫描" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(clickToPresentZbarView) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];

在“-(void)clickToPresentZbarView”里：

ZBarReaderViewController * readerVC = [[ZBarReaderViewController alloc] init];
readerVC.readerDelegate = self;

readerVC.showsZBarControls = YES;//显示控制项
readerVC.tracksSymbols = YES; //显示追踪框

//设置识别范围
//(距离左边/宽度，距离上边/高度，识别宽度/宽度，识别高度/高度)
float width = SCREEN_WIDTH*500.f/750.f;  //扫描宽度：屏幕宽度的2/3
float height = SCREEN_WIDTH*500.f/750.f; //扫描宽度：屏幕宽度的2/3
float scanV_X = (SCREEN_WIDTH-width)/2.f;
float scanV_Y = (SCREEN_HEIGHT-height)/2.f;
CGRect scanViewRect = CGRectMake(scanV_X/SCREEN_WIDTH, scanV_Y/SCREEN_HEIGHT, width/SCREEN_WIDTH, height/SCREEN_HEIGHT);
readerVC.scanCrop = scanViewRect;

//readerVC.scanCrop = CGRectMake(0, 0, 1, 1);//扫描范围：屏幕大小


//设置识别的参数   根据需求调整，可以提高识别速度。
ZBarImageScanner *scanner = readerVC.scanner;
[scanner setSymbology:ZBAR_I25 //此参数和“to"后面的参数配合 确定了识别的编码范围
               config:ZBAR_CFG_ENABLE
                   to:0];
[self presentViewController:readerVC animated:YES completion:nil];

协议方法：

#pragma mark - ZBarReaderDelegate
-(void)imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo:(NSDictionary*)info {
    id results =[info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol =nil;
    for(symbol in results)
        break;
    NSLog(@"%@",symbol.data);//打印识别的数据
    [reader dismissViewControllerAnimated:YES completion:^{
    
    }];

}

效果：

初次，会提示“访问相机权限：

初次，会提示“访问相机权限”

之后，可以扫描

返回结果：
2017-09-12 21:41:48.586385 scanVC[3952:1369923] http://r.m.baidu.com/3ii99ns
放在屏幕中央位置，才扫描成功！！！
因为设置了识别范围。

当然，这种扫描的信息是可以直接加载的网址！

若获取到的二维码内部信息是一些参数，需要处理这些参数！这就是不同APP的处理了！

Demo：获取二维码信息
真机测试，参考：《开发者账号真机测试》、《个人账号真机测试》

B.继承ZBarReaderViewController

继承成功的“ScanQRViewController.h”内部：

#import  //头文件

@interface ScanQRViewController : ZBarReaderViewController

@end

使用：push到扫描界面

ScanQRViewController * readerQR_VC = [[ScanQRViewController alloc] init];
readerQR_VC.title = @"XXXXX";
readerQR_VC.readerDelegate = self;

//设置识别的参数   根据需求调整，可以提高识别速度。
ZBarImageScanner * scanner = readerQR_VC.scanner;
[scanner setSymbology:ZBAR_I25 //此参数和“to"后面的参数配合 确定了识别的编码范围
           config:ZBAR_CFG_ENABLE
               to:0];

[self.navigationController pushViewController:readerQR_VC animated:YES];

协议方法：里面处理扫描到的信息！

#pragma mark - ZBarReaderDelegate 
-(void)imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo:(NSDictionary*)info {
    id results =[info objectForKey:ZBarReaderControllerResults];
    ZBarSymbol *symbol =nil;
    for(symbol in results)
        break;
    NSLog(@"%@",symbol.data);//打印识别的数据
    [reader.navigationController popViewControllerAnimated:YES];

}

在“ScanQRViewController.m”内部：

-(void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    //显示状态栏
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];
}


- (void)viewDidLoad {
    [super viewDidLoad];

    self.showsZBarControls = NO; //隐藏控制项
    self.tracksSymbols = NO; //隐藏追踪框

//设置识别范围（距离左边/宽度，距离上边/高度，识别宽度/宽度，识别高度/高度）
    float width = SCREEN_WIDTH*500.f/750.f;
    float height = SCREEN_WIDTH*500.f/750.f;
    float scanV_X = (SCREEN_WIDTH-width)/2.f;
    float scanV_Y = (SCREEN_HEIGHT-height)/2.f;
    CGRect scanViewRect = CGRectMake(scanV_X/SCREEN_WIDTH, scanV_Y/SCREEN_HEIGHT, width/SCREEN_WIDTH, height/SCREEN_HEIGHT);
    self.scanCrop = scanViewRect;


    [self setMaskViewAndScanAnimation];
}


-(void)setMaskViewAndScanAnimation {
    //掩盖视图maskView
    UIView * maskView = [[UIView alloc] initWithFrame:SCREEN_Bounds];
    maskView.backgroundColor = [UIColor clearColor];
    self.cameraOverlayView = maskView;//添加蒙版视图

    //扫描范围
    float width = SCREEN_WIDTH*500.f/750.f;
    float height = SCREEN_WIDTH*500.f/750.f;
    UIView * scanBoxV = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)];
    scanBoxV.backgroundColor = [UIColor clearColor];//透明色才能扫描
    scanBoxV.center = maskView.center;
    [maskView addSubview:scanBoxV];
    scanBoxV.layer.borderWidth = 2.f;
    scanBoxV.layer.borderColor = ChosedColor.CGColor;


    //扫描动画 （根据UI需求：放图片或试图）
    UIImageView *lineImgV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, width, 3)];
    [scanBoxV addSubview:lineImgV];
    lineImgV.image = [UIImage imageNamed:@"scan_line"];
    [UIView beginAnimations:@"animationID" context:NULL];
    [UIView setAnimationDuration:3.f];

    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    [UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:lineImgV cache:YES];
    [UIView setAnimationRepeatCount:100];//重复次数

    [lineImgV setFrame:CGRectMake(0, 0+width, width, 3)]; //最终位置
    [UIView commitAnimations];
}

效果：

由于获取二维码信息这一块，已经被实现了！我们的工作就只有处理 二维码信息了！
#pragma mark - ZBarReaderDelegate      二维码信息获取
-(void)imagePickerController:(UIImagePickerController*)reader didFinishPickingMediaWithInfo:(NSDictionary*)info {
   id results =[info objectForKey:ZBarReaderControllerResults];
   ZBarSymbol *symbol =nil;
   for(symbol in results)
       break;
   NSLog(@"%@",symbol.data);//打印识别的数据
   //[reader.navigationController popViewControllerAnimated:YES];
}
即：根据我们APP的需要，对获取的信息(symbol.data)进行处理、封装！

闪光灯

在- (void)viewDidLoad { }里面：

//闪光灯按钮
_flashLightBtn = [[UIButton alloc] init];
[_flashLightBtn addTarget:self action:@selector(openOrCloseFlashLight) forControlEvents:UIControlEventTouchUpInside];
[_flashLightBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];//字体颜色
[_flashLightBtn setTitle:@"闪光灯:打开" forState:UIControlStateNormal];//正常状态标题
[_flashLightBtn setTitle:@"闪光灯:关闭" forState:UIControlStateSelected];//选中状态标题
[maskView addSubview:_flashLightBtn];
[_flashLightBtn mas_makeConstraints:^(MASConstraintMaker *make) {
    make.centerX.equalTo(maskView);
    make.bottom.equalTo(maskView).with.offset(-SCREEN_WIDTH*30.f/750.f);
    make.width.mas_equalTo(SCREEN_WIDTH*1.f/2.f);
    make.height.mas_equalTo(SCREEN_WIDTH*60.f/750.f);
}];


//关闭闪光灯(进入后)
readerView.torchMode = 0;

-(void)openOrCloseFlashLight {
     if (_flashLightBtn.selected == YES) { 
        //当前：点亮状态
        readerView.torchMode = 0;//关闭
        _flashLightBtn.selected = NO;
    } else { //当前：关闭状态
        readerView.torchMode = 1;//打开
        _flashLightBtn.selected = YES;
    }

}

效果：

闪光灯

goyohol's essay

二维码：ZBarReaderViewController

头文件：#import "ZBarSDK.h"

A.直接使用ZBarReaderViewController：

B.继承ZBarReaderViewController

闪光灯

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头文件：`#import "ZBarSDK.h"`