// 二維碼的生成 // 1、創(chuàng)建過濾器 CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; // 2、恢復(fù)濾鏡的默認(rèn)屬性 [filter setDefaults]; // 3、設(shè)置內(nèi)容 NSString *str = @"這是一個(gè)二維碼的生成結(jié)果"; NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; // 使用KVO設(shè)置屬性 [filter setValue:data forKey:@"inputMessage"]; // 4、獲取輸出文件 CIImage *outputImage = [filter outputImage]; // 5、顯示二維碼 self.imageView.image = [UIImage imageWithCIImage:outputImage];

/** * 根據(jù)CIImage生成指定大小的UIImage * * @param image CIImage * @param size 圖片寬度 */- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size{ CGRect extent = CGRectIntegral(image.extent); CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); // 1.創(chuàng)建bitmap; size_t width = CGRectGetWidth(extent) * scale; size_t height = CGRectGetHeight(extent) * scale; CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray(); CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone); CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef bitmapImage = [context createCGImage:image fromRect:extent]; CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone); CGContextScaleCTM(bitmapRef, scale, scale); CGContextDrawImage(bitmapRef, extent, bitmapImage); // 2.保存bitmap到圖片 CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef); CGContextRelease(bitmapRef); CGImageRelease(bitmapImage); return [UIImage imageWithCGImage:scaledImage];}

NSString *str = @http://www.baidu.com;

#import "ViewController.h"#import <AVFoundation/AVFoundation.h>@interface ViewController () <AVCaptureMetadataOutputObjectsDelegate>/**顯示圖層*/@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;/**捕捉會(huì)話*/@property (nonatomic, strong) AVCaptureSession *session;@end@implementation ViewController- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ // 二維碼的掃描 // 1、創(chuàng)建捕捉會(huì)話 AVCaptureSession *session = [[AVCaptureSession alloc] init]; self.session = session; // 2.添加輸入設(shè)備(數(shù)據(jù)從攝像頭輸入) AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; [session addInput:input]; // 3、添加輸出數(shù)據(jù)(示例對(duì)象-->類對(duì)象-->元類對(duì)象-->根元類對(duì)象) AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init]; [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [session addOutput:output]; // 3.1.設(shè)置輸入元數(shù)據(jù)的類型(類型是二維碼數(shù)據(jù)) [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]]; // 4、添加掃描圖層 AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session]; layer.frame = self.view.bounds; [self.view.layer addSublayer:layer]; self.layer = layer; // 5、開始掃描 [session startRunning];}/** * 實(shí)現(xiàn)output的回調(diào)方法 */- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{ // 數(shù)組metadataObjects中存放結(jié)果數(shù)據(jù) if (metadataObjects.count > 0) { // 獲取最終的讀取結(jié)果 AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject]; NSLog(@"%@",object.stringValue); [self.session stopRunning]; [self.layer removeFromSuperlayer]; } else { NSLog(@"沒有掃描到數(shù)據(jù)"); }}