二维码、条形码扫描

本文介绍的是系统自带的二维码扫描！方便简单实用。-----话不多说，直接上干货！

三步就搞定！！！！！！！          QQ :  137026391--马尾  欢迎指教

1、首页   先创建扫描按钮、显示扫描结果的label

- (void)viewDidLoad {

[super viewDidLoad];

//扫描按钮

self.scanButton = [UIButton buttonWithType:UIButtonTypeSystem];

self.scanButton.frame = CGRectMake((SCREEN_WIDTH - 100) / 2, SCREEN_HEIGHT - 100, 100, 30);

[self.scanButton setTitle:@"扫描" forState:UIControlStateNormal];

[self.scanButton addTarget:self action:@selector(scanAction:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:self.scanButton];

//显示扫描结果

self.resultLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 200, SCREEN_WIDTH, 100)];

self.resultLabel.textAlignment = NSTextAlignmentCenter;

self.resultLabel.numberOfLines = 0;

self.resultLabel.backgroundColor = [UIColor redColor];

[self.view addSubview:self.resultLabel];

}

* 扫描事件

- (void)scanAction:(UIButton *)sender{

ZFScanViewController * vc = [[ZFScanViewController alloc] init];

vc.returnScanBarCodeValue = ^(NSString * barCodeString){

self.resultLabel.text = [NSString stringWithFormat:@"扫描结果:\n%@",barCodeString];

NSLog(@"扫描结果的字符串======%@",barCodeString);

};

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

}

2、创建扫描

#import "ZFScanViewController.h"

#import#import "ZFConst.h"

#import "ZFMaskView.h"

@interface ZFScanViewController ()

/** 输入输出的中间桥梁 */

@property (nonatomic, strong) AVCaptureSession * session;

/** 扫描支持的编码格式的数组 */

@property (nonatomic, strong) NSMutableArray * metadataObjectTypes;

/** 遮罩层 */

@property (nonatomic, strong) ZFMaskView * maskView;

@end

@implementation ZFScanViewController

- (NSMutableArray *)metadataObjectTypes{

if (!_metadataObjectTypes) {

_metadataObjectTypes = [NSMutableArray arrayWithObjects:AVMetadataObjectTypeAztecCode, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeUPCECode, nil];

// >= iOS 8

if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1) {

[_metadataObjectTypes addObjectsFromArray:@[AVMetadataObjectTypeInterleaved2of5Code, AVMetadataObjectTypeITF14Code, AVMetadataObjectTypeDataMatrixCode]];

}

}

return _metadataObjectTypes;

}

- (void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];

[self.maskView removeAnimation];

}

- (void)viewDidLoad {

[super viewDidLoad];

[self capture];

[self addUI];

}

/**

*  添加遮罩层

*/

- (void)addUI{

self.maskView = [[ZFMaskView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];

[self.view addSubview:self.maskView];

}

/**

*  扫描初始化

*/

- (void)capture{

//获取摄像设备

AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

//创建输入流

AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

//创建输出流

AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc] init];

//设置代理 在主线程里刷新

[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

//初始化链接对象

self.session = [[AVCaptureSession alloc] init];

//高质量采集率

self.session.sessionPreset = AVCaptureSessionPresetHigh;

[self.session addInput:input];

[self.session addOutput:output];

AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];

layer.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

layer.videoGravity = AVLayerVideoGravityResizeAspectFill;

layer.backgroundColor = [UIColor yellowColor].CGColor;

[self.view.layer addSublayer:layer];

//设置扫描支持的编码格式(如下设置条形码和二维码兼容)

output.metadataObjectTypes = self.metadataObjectTypes;

//开始捕获

[self.session startRunning];

}

#pragma mark - AVCaptureMetadataOutputObjectsDelegate

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

if (metadataObjects.count > 0) {

[self.session stopRunning];

AVMetadataMachineReadableCodeObject * metadataObject = metadataObjects.firstObject;

self.returnScanBarCodeValue(metadataObject.stringValue);

[self.navigationController popViewControllerAnimated:YES];

}

}

3、设置扫描界面的UI

#import "ZFMaskView.h"

#import "ZFConst.h"

@interface ZFMaskView()

@property (nonatomic, strong) UIImageView * scanLineImg;

@end

@implementation ZFMaskView

- (instancetype)initWithFrame:(CGRect)frame{

self = [super initWithFrame:frame];

if (self) {

[self addUI];

}

return self;

}

/**

*  添加UI

*/

- (void)addUI{

//遮罩层

UIView * maskView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

maskView.backgroundColor = [UIColor blackColor];

maskView.alpha = 0.5;

maskView.layer.mask = [self maskLayer];

[self addSubview:maskView];

//提示框

UILabel * hintLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width - 120, 60)];

hintLabel.text = @"将 二维码/条形码 放入框内中央，即可自动扫描";

hintLabel.center = CGPointMake(maskView.center.x, maskView.center.y + (self.frame.size.width - 120) * 0.5 + 40);

hintLabel.textColor = [UIColor lightGrayColor];

hintLabel.numberOfLines = 0;

hintLabel.textAlignment = NSTextAlignmentCenter;

[self addSubview:hintLabel];

//边框

UIImage * topLeft = [UIImage imageNamed:@"ScanQR1"];

UIImage * topRight = [UIImage imageNamed:@"ScanQR2"];

UIImage * bottomLeft = [UIImage imageNamed:@"ScanQR3"];

UIImage * bottomRight = [UIImage imageNamed:@"ScanQR4"];

//左上

UIImageView * topLeftImg = [[UIImageView alloc] initWithFrame:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5, topLeft.size.width, topLeft.size.height)];

topLeftImg.image = topLeft;

[self addSubview:topLeftImg];

//右上

UIImageView * topRightImg = [[UIImageView alloc] initWithFrame:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5 - topRight.size.width + self.frame.size.width - 120, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5, topRight.size.width, topRight.size.height)];

topRightImg.image = topRight;

[self addSubview:topRightImg];

//左下

UIImageView * bottomLeftImg = [[UIImageView alloc] initWithFrame:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5 - bottomLeft.size.height + self.frame.size.width - 120, bottomLeft.size.width, bottomLeft.size.height)];

bottomLeftImg.image = bottomLeft;

[self addSubview:bottomLeftImg];

//右下

UIImageView * bottomRightImg = [[UIImageView alloc] initWithFrame:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5 - bottomRight.size.width + self.frame.size.width - 120, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5 - bottomRight.size.width + self.frame.size.width - 120, bottomRight.size.width, bottomRight.size.height)];

bottomRightImg.image = bottomRight;

[self addSubview:bottomRightImg];

//扫描线

UIImage * scanLine = [UIImage imageNamed:@"QRCodeScanLine"];

self.scanLineImg = [[UIImageView alloc] initWithFrame:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5, self.frame.size.width - 120, scanLine.size.height)];

self.scanLineImg.image = scanLine;

self.scanLineImg.contentMode = UIViewContentModeScaleAspectFit;

[self addSubview:self.scanLineImg];

[self.scanLineImg.layer addAnimation:[self animation] forKey:nil];

}

- (CABasicAnimation *)animation{

CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"position"];

animation.duration = 3;

animation.fillMode = kCAFillModeForwards;

animation.removedOnCompletion = NO;

animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

animation.repeatCount = MAXFLOAT;

animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5)];

animation.toValue = [NSValue valueWithCGPoint:CGPointMake(self.center.x, self.scanLineImg.frame.origin.y + self.frame.size.width - 120 - self.scanLineImg.frame.size.height * 0.5)];

return animation;

}

/**

*  遮罩层bezierPath

*

*  @return UIBezierPath

*/

- (UIBezierPath *)maskPath{

UIBezierPath * bezier = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];

[bezier appendPath:[[UIBezierPath bezierPathWithRect:CGRectMake((self.frame.size.width - (self.frame.size.width - 120)) * 0.5, (self.frame.size.height - (self.frame.size.width - 120)) * 0.5, self.frame.size.width - 120, self.frame.size.width - 120)] bezierPathByReversingPath]];

return bezier;

}

/**

*  遮罩层ShapeLayer

*

*  @return CAShapeLayer

*/

- (CAShapeLayer *)maskLayer{

CAShapeLayer * layer = [CAShapeLayer layer];

layer.path = [self maskPath].CGPath;

return layer;

}

/**

*  移除动画

*/

- (void)removeAnimation{

[self.scanLineImg.layer removeAllAnimations];

}

@end