ios原生二维码扫描和生成

之前都是第三方的二维码，操作简单pod集成，美滋滋。随着公司项目越来越恶心到大，还是自己撸一个比较实在。
demo的主要功能扫描二维码和生成二维码。

扫描二维码

1.首先倒入框架

#import <AVFoundation/AVFoundation.h>

2.遵守协议

<AVCaptureMetadataOutputObjectsDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

3.主要用到的属性设置

 //捕获设备，默认后置摄像头
@property (strong, nonatomic) AVCaptureDevice * device;

 //输入设备
@property (strong, nonatomic) AVCaptureDeviceInput * input;

//输出设备，需要指定他的输出类型及扫描范围
@property (strong, nonatomic) AVCaptureMetadataOutput * output;

 //AVFoundation框架捕获类的中心枢纽，协调输入输出设备以获得数据
@property (strong, nonatomic) AVCaptureSession * session;

//展示捕获图像的图层，是CALayer的子类
@property (strong, nonatomic) AVCaptureVideoPreviewLayer * preview;

扫描截图.png

4.拉起本地相册二维码

- (void)chooseButtonClick
{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        //关闭扫描
        [self stopScan];
        
        //1 弹出系统相册
        UIImagePickerController *pickVC = [[UIImagePickerController alloc]init];
        //2 设置照片来源
        /**
         UIImagePickerControllerSourceTypePhotoLibrary,相册
         UIImagePickerControllerSourceTypeCamera,相机
         UIImagePickerControllerSourceTypeSavedPhotosAlbum,照片库
         */
        
        pickVC.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        //3 设置代理
        pickVC.delegate = self;
        //4.转场动画
        self.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
        [self presentViewController:pickVC animated:YES completion:nil];
    }
    else
    {
        [self showAlertViewWithTitle:@"打开失败" withMessage:@"相册打开失败。设备不支持访问相册，请在设置->隐私->照片中进行设置！"];
    }
    
}

生成二维码

1.二维码的生成

/**
     *  2.生成CIFilter(滤镜)对象
     */
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    
    /**
     *  3.恢复滤镜默认设置
     */
    [filter setDefaults];
    
    /**
     *  4.设置数据(通过滤镜对象的KVC)
     */
    //存放的信息
    NSString *info = @"hahahahhahahaha";
    //把信息转化为NSData
    NSData *infoData = [info dataUsingEncoding:NSUTF8StringEncoding];
    //滤镜对象kvc存值
    [filter setValue:infoData forKeyPath:@"inputMessage"];
    
    /**
     *  5.生成二维码
     */
    CIImage *outImage = [filter outputImage];
    
    //imageView.image = [UIImage imageWithCIImage:outImage];//不处理图片模糊,故而调用下面的信息
    
    self.codeImage.image = [outImage createNonInterpolatedWithSize:150];

2.保存到本地相册

 UIGraphicsBeginImageContext(self.view.bounds.size);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    //获取图片
    UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
    //关闭上下文
    UIGraphicsEndImageContext();
    completion(image);
    
    /**
     *  将图片保存到本地相册
     */
    UIImageWriteToSavedPhotosAlbum(image, self , @selector(saveImage:didFinishSavingWithError:contextInfo:), nil);//保存图片到照片库

主要代码贴出来，感兴趣可以去gibHub地址：https://github.com/MrBMask 这里瞅瞅呦