二维码+遮罩

首先是要用到的几个类

@property (strong,nonatomic)AVCaptureDevice * device;

@property (strong,nonatomic)AVCaptureDeviceInput * input;

@property (strong,nonatomic)AVCaptureMetadataOutput * output;

@property (strong,nonatomic)AVCaptureSession * session;

@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;

下面分别创建他们

// Device

_device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

// Input

_input = [AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];

// Output

_output = [[AVCaptureMetadataOutputalloc]init];

[_outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

// Session

_session = [[AVCaptureSessionalloc]init];

[_sessionsetSessionPreset:AVCaptureSessionPresetHigh];

if ([_sessioncanAddInput:self.input])

{

[_sessionaddInput:self.input];

}

if ([_sessioncanAddOutput:self.output])

{

[_sessionaddOutput:self.output];

}

// 条码类型 AVMetadataObjectTypeQRCode

_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

// Preview

_preview =[AVCaptureVideoPreviewLayerlayerWithSession:_session];

_preview.videoGravity =AVLayerVideoGravityResizeAspectFill;

_preview.frame =self.view.layer.bounds;

[self.view.layerinsertSublayer:_previewatIndex:0];

// Start

[_sessionstartRunning];

然后实现 AVCaptureMetadataOutputObjectsDelegate

#pragma mark AVCaptureMetadataOutputObjectsDelegate

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection

{

 //判断是否有数据

    if (metadataObjects != nil && [metadataObjects count] > 0) {

        AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];

//        NSLog(@"------ 二维码数据 %@ %@",[metadataObj stringValue],metadataObjects);

//        NSDictionary *dic = (NSDictionary *)[metadataObj stringValue];

        

        NSData *jsonData = [[metadataObj stringValue] dataUsingEncoding:NSUTF8StringEncoding];

        NSError *err;

        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData

                                                            options:NSJSONReadingMutableContainers

                                                              error:&err];

        

        NSLog(@"------ 二维码数据 dic %@",dic);

        NSLog(@"------ 二维码数据 code %@",[dic objectForKey:@"code"]);

        ScanManager *manager = [ScanManager manager];

        manager.tableDic = dic;

        NSLog(@" ======= tableDic %@",manager.tableDic);

        

        //判断回传的数据类型

        if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) {

            [_lblStatus performSelectorOnMainThread:@selector(setText:) withObject:[metadataObj stringValue] waitUntilDone:NO];

            [self performSelectorOnMainThread:@selector(stopReading) withObject:nil waitUntilDone:NO];

            _isReading = NO;

            [self dismissViewControllerAnimated:YES completion:nil];

        }

    }

-(void)stopReading

{

    [_session stopRunning];

    [_scanImg removeFromSuperview];

}

 

 

 

-------------------------- 遮罩

#import <UIKit/UIKit.h>

#define kMaskViewBorderWidth 2.0f

 

@interface MaskView : UIView

 

@property (unsafe_unretained, nonatomic)CGRect cropRect;

@property (strong, nonatomic) UIColor *borderColor;

@end

#import "MaskView.h"

 

@implementation MaskView

 

- (void)drawRect:(CGRect)rect {

    [super drawRect:rect];

    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextSetRGBFillColor(ctx, 0, 0, 0, 0.4);

    CGContextFillRect(ctx, self.bounds);

    

    CGContextSetStrokeColorWithColor(ctx, self.borderColor.CGColor);

    CGContextStrokeRectWithWidth(ctx, _cropRect, kMaskViewBorderWidth);

    

    CGContextClearRect(ctx, _cropRect);

}

 

@end