2016.1.18scan 二维码（仿照支付宝。微信）

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1 生成二维码（原生方法生成二维码）

首先要把二维码上的信息付给他

tempStr=self.textField.text;

其次创建一个图片（在此之前需要导入#import "QRCodeGenerator.h"）

UIImage*tempImage=[QRCodeGenerator qrImageForString:tempStr imageSize:360 Topimg:image withColor:RandomColor];

_outImageView.image=t 这是一个imageviewpImage;

2.扫描二维码

2.1添加手势长按识别

UILongPressGestureRecognizer*longPress=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(dealLongPress:)];

//把手势添加到图片上

[_outImageView addGestureRecognizer:longPress];

[self.view addSubview:_outImageView]

2.2长按手势方法并输出显示

-(void)dealLongPress:(UIGestureRecognizer*)gesture{

if(gesture.state==UIGestureRecognizerStateBegan){

_timer.fireDate=[NSDate distantFuture];

UIImageView*tempImageView=(UIImageView*)gesture.view;

if(tempImageView.image){

//1. 初始化扫描仪，设置设别类型和识别质量

CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];

//2. 扫描获取的特征组

NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:tempImageView.image.CGImage]];

//3. 获取扫描结果

CIQRCodeFeature *feature = [features objectAtIndex:0];

NSString *scannedResult = feature.messageString;

UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:scannedResult delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertView show];

}else {

UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:@"您还没有生成二维码" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertView show];

}

}else if (gesture.state==UIGestureRecognizerStateEnded){

//定时器可不要

_timer.fireDate=[NSDate distantPast];

}

3 正常用相机扫描（导入 #import <AVFoundation/AVFoundation.h>

#import "UIView+SDExtension.h"）

创建session对象

@property (nonatomic, strong) AVCaptureSession *session;

{

//获取摄像设备

AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

//创建输入流

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

if (!input) return;

//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()];

//设置有效扫描区域

CGRect scanCrop=[self getScanCrop:_scanWindow.bounds readerViewBounds:self.view.frame];

output.rectOfInterest = scanCrop;

//初始化链接对象

_session = [[AVCaptureSession alloc]init];

//高质量采集率

[_session setSessionPreset:AVCaptureSessionPresetHigh];

[_session addInput:input];

[_session addOutput:output];

//设置扫码支持的编码格式(如下设置条形码和二维码兼容)

output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];

AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];

layer.videoGravity=AVLayerVideoGravityResizeAspectFill;

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

[self.view.layer insertSublayer:layer atIndex:0];

//开始捕获

[_session startRunning];

4.选择一张图片然后在扫描

#pragma mark-> 我的相册

-(void)myAlbum{

NSLog(@"我的相册");

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){

//1.初始化相册拾取器

UIImagePickerController *controller = [[UIImagePickerController alloc] init];

//2.设置代理

controller.delegate = self;

//3.设置资源：

/**

UIImagePickerControllerSourceTypePhotoLibrary,相册

UIImagePickerControllerSourceTypeCamera,相机

UIImagePickerControllerSourceTypeSavedPhotosAlbum,照片库

controller.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

//4.随便给他一个转场动画

controller.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;

[self presentViewController:controller animated:YES completion:NULL];

}else{

UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"设备不支持访问相册，请在设置->隐私->照片中进行设置！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alert show];

}

#pragma mark-> imagePickerController delegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

//1.获取选择的图片

UIImage *image = info[UIImagePickerControllerOriginalImage];

//2.初始化一个监测器

CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];

[picker dismissViewControllerAnimated:YES completion:^{

//监测到的结果数组

NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];

if (features.count >=1) {

/**结果对象 */

CIQRCodeFeature *feature = [features objectAtIndex:0];

NSString *scannedResult = feature.messageString;

UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:scannedResult delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertView show];

}

else{

UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"该图片没有包含一个二维码！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertView show];

}

}];

}

5 打开闪光灯

#pragma mark-> 闪光灯

-(void)openFlash:(UIButton*)button{

NSLog(@"闪光灯");

button.selected = !button.selected;

if (button.selected) {

[self turnTorchOn:YES];

}