iOS15 OC二维码扫描

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "LJPreView.h"
//遵守代理
@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>
@property(nonatomic,strong)AVCaptureSession *session;
@property(nonatomic,strong)AVCaptureDeviceInput *input;
@property(nonatomic,strong)AVCaptureMetadataOutput *output;
//@property(nonatomic,strong)AVCaptureVideoPreviewLayer *previewLayer;

@property(nonatomic,strong)LJPreView *preView;
@end

@implementation ViewController
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    self.input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    self.output = [[AVCaptureMetadataOutput alloc]init];
    
    self.session = [[AVCaptureSession alloc]init];
    
    [self.session setSessionPreset:AVCaptureSessionPresetHigh];
    
    if([self.session canAddInput:self.input]){
        [self.session addInput:self.input];
    }
    if([self.session canAddOutput:self.output]){
        [self.session addOutput:self.output];
        
    }
    //设置代理
    
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    //设置元数据类型 二维码 即 QR
    [self.output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
    
   /* self.previewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];
    self.previewLayer.frame = self.view.bounds;
    [self.view.layer addSublayer:self.previewLayer];
    */
    
    self.preView = [[LJPreView alloc]initWithFrame:self.view.bounds];
    
    self.preView.session = self.session;
    
    [self.view addSubview:self.preView];
    //启动会话
    [self.session startRunning];
    
    
    
    
}


#pragma mark - 实现代理方法
- (void)captureOutput:(AVCaptureOutput *)output didOutputMetadataObjects:(NSArray<__kindof AVMetadataObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    
    //结束会话
    [self.session stopRunning];
//    [self.previewLayer removeFromSuperlayer];
    
    [self.preView removeFromSuperview];
    
    
    NSString *msg  = nil;
    
    
    for(AVMetadataMachineReadableCodeObject *objc in metadataObjects){
        NSLog(@"%@",objc);
        msg = objc.stringValue;
        NSLog(@"%@",objc.stringValue);
    }
    
    UIAlertController *alerVC = [UIAlertController alertControllerWithTitle:@"扫描结果" message:msg preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];
    [alerVC addAction:action];
    [self presentViewController:alerVC animated:YES completion:nil];
    
}

@end

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
NS_ASSUME_NONNULL_BEGIN

@interface LJPreView : UIView

@property(nonatomic,strong)AVCaptureSession *session;

@end

NS_ASSUME_NONNULL_END

//
//  LJPreView.m
//  二维码
//
//  Created by lujun on 2022/1/17.
//

#import "LJPreView.h"
@interface LJPreView()
@property(nonatomic,strong)UIImageView *imageView;
@property(nonatomic,strong)UIImageView *lineImageView;
@property(nonatomic,strong)NSTimer *timer;
@end
@implementation LJPreView

-(void)setupUI{
    _imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"scan@2x.png"]];
    _imageView.frame = CGRectMake(self.bounds.size.width * 0.5 - 140, self.bounds.size.height * 0.5 - 140, 280, 280);
    [self addSubview:_imageView];
    
    _lineImageView = [[UIImageView alloc]initWithFrame:CGRectMake(30, 10, 220, 2)];
    _lineImageView.image = [UIImage imageNamed:@"scanning@2x.png"];
    [_imageView addSubview:_lineImageView];
    
    _timer  = [NSTimer scheduledTimerWithTimeInterval:3.0f target:self selector:@selector(animation) userInfo:nil repeats:YES];
}

-(void)animation{
    [UIView animateWithDuration:2.8 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
       self->_lineImageView.frame = CGRectMake(30, 260, 220, 2);
        } completion:^(BOOL finished) {
            self->_lineImageView.frame = CGRectMake(30, 10, 220, 2);
        }];
}

- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        [self setupUI];
    }
    return self;
}

- (void)setSession:(AVCaptureSession *)session{
    _session = session;
    AVCaptureVideoPreviewLayer *layer = (AVCaptureVideoPreviewLayer *)self.layer;
    layer.session = session;
}

+(Class)layerClass{
    return [AVCaptureVideoPreviewLayer class];
}


@end