iOS设置和获取条形码

//
//  Copyright © 2016年 hjl. All rights reserved.
//

#import "HHBarcodeViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface HHBarcodeViewController ()

/** 会话 */
@property (nonatomic, strong) AVCaptureSession *session;

//* 预览图层 */
@property (nonatomic, weak) AVCaptureVideoPreviewLayer *previewLayer;
@end

@implementation HHBarcodeViewController

- (void)viewDidLoad {
[super viewDidLoad];

// 条形码页面动画
CADisplayLink *disp = [CADisplayLink displayLinkWithTarget:self selector:@selector(update)];

[disp addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
// 1. 实例化拍摄设备
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// 2. 设置输入设备
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
// 3. 实例化拍摄元数据输出
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
// 4. 设置输出数据代理
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
// 5. 添加拍摄会话
AVCaptureSession *session = [[AVCaptureSession alloc] init];
self.session = session;
// 6. 添加会话输入/输出
if ([session canAddInput:input]) {
[session addInput:input];
}
if ([session canAddOutput:output]) {
[session addOutput:output];
}
//7 设置输出数据类型，需要将元数据输出添加到会话后，才能指定元数据类型，否则会报错
[output setMetadataObjectTypes:@[
AVMetadataObjectTypeUPCECode,
AVMetadataObjectTypeCode39Code,
AVMetadataObjectTypeCode39Mod43Code,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode93Code,
AVMetadataObjectTypeCode128Code,
AVMetadataObjectTypePDF417Code,
AVMetadataObjectTypeAztecCode,
AVMetadataObjectTypeInterleaved2of5Code,
AVMetadataObjectTypeITF14Code,
AVMetadataObjectTypeDataMatrixCode,
]];
//8 实例化预览图层
AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
previewLayer.frame = self.view.bounds;
self.previewLayer = previewLayer;
//previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//9 将图层插入当前视图
[self.view.layer insertSublayer:previewLayer atIndex:0];
//10 启动会话
[_session startRunning];

}

#pragma 代理
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{

//1 判断是否获取到数据
if (metadataObjects.count > 0) {
//2 停止刷新
[self.session stopRunning];
//3 移除预览图层
[self.previewLayer removeFromSuperlayer];
//4 读取数据
AVMetadataMachineReadableCodeObject *obj = [metadataObjects lastObject];
HHLog(@"%@", obj.stringValue);
}

}

- (void)update{
_barcodeConsY.constant += 3;
if(_barcodeConsY.constant >= 224){
_barcodeConsY.constant = 0;
}
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end