参考：https://github.com/nglszs/BCQRcode
方式一：
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#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end**************#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; UIBarButtonItem *leftBtn = [[UIBarButtonItem alloc] initWithTitle:@"生成" style:UIBarButtonItemStylePlain target:self action:@selector(backView)]; self.navigationItem.leftBarButtonItem = leftBtn; UIBarButtonItem *rightBtn = [[UIBarButtonItem alloc] initWithTitle:@"扫描" style:UIBarButtonItemStylePlain target:self action:@selector(ScanView)]; self.navigationItem.rightBarButtonItem = rightBtn; //长按识别图中的二维码，类似于微信里面的功能,前提是当前页面必须有二维码 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(readCode:)]; [self.view addGestureRecognizer:longPress];}- (void)readCode:(UILongPressGestureRecognizer *)pressSender { if (pressSender.state == UIGestureRecognizerStateBegan) { //截图 再读取 UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, 0); CGContextRef context = UIGraphicsGetCurrentContext(); [self.view.layer renderInContext:context]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //识别二维码 CIImage *ciImage = [[CIImage alloc] initWithCGImage:image.CGImage options:nil]; CIContext *ciContext = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}]; // 软件渲染 CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:ciContext options:@{CIDetectorAccuracy : CIDetectorAccuracyHigh}];// 二维码识别 NSArray *features = [detector featuresInImage:ciImage]; for (CIQRCodeFeature *feature in features) { NSLog(@"msg = %@",feature.messageString); // 打印二维码中的信息 //对结果进行处理 ResultViewController *resultVC = [[ResultViewController alloc] init]; resultVC.contentString = feature.messageString; [self.navigationController pushViewController:resultVC animated:NO]; } }}- (void)backView { UIImageView *codeImageView = [[UIImageView alloc] initWithFrame:CGRectMake((BCWidth - 200)/2, 100, 200, 200)]; codeImageView.layer.borderColor = [UIColor orangeColor].CGColor; codeImageView.layer.borderWidth = 1; [self.view addSubview:codeImageView]; //有图片的时候，也可以不设置圆角 [codeImageView creatCode:@"https://www.baidu.com" Image:[UIImage imageNamed:@"bg"] andImageCorner:4]; //没有图片的时候 // [codeImageView creatCode:@"这波可以" Image:nil andImageCorner:4];}- (void)ScanView { [self.navigationController pushViewController:[ScanCodeViewController new] animated:YES];}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end************生成二维码#import <UIKit/UIKit.h>@interface UIImageView (CreatCode)/** 这里传入二维码的信息,image是加载二维码上方的图片,如果不要图片直接codeImage为nil即可,后面是图片的圆角 */- (void)creatCode:(NSString *)codeContent Image:(UIImage *)codeImage andImageCorner:(CGFloat)imageCorner;@end**************#import "UIImageView+CreatCode.h"#define ImageSize self.bounds.size.width@implementation UIImageView (CreatCode)- (void)creatCode:(NSString *)codeContent Image:(UIImage *)codeImage andImageCorner:(CGFloat)imageCorner { //用CoreImage框架实现二维码的生成，下面方法最好异步调用 dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ CIFilter *codeFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; //每次调用都恢复其默认属性 [codeFilter setDefaults]; NSData *codeData = [codeContent dataUsingEncoding:NSUTF8StringEncoding]; //设置滤镜数据 [codeFilter setValue:codeData forKey:@"inputMessage"]; //获得滤镜输出的图片 CIImage *outputImage = [codeFilter outputImage]; //这里的图像必须经过位图转换，不然会很模糊 UIImage *translateImage = [self creatUIImageFromCIImage:outputImage andSize:ImageSize]; //这里如果不想设置圆角，直接传一个image就好了 UIImage *resultImage = [self setSuperImage:translateImage andSubImage:[self imageCornerRadius:imageCorner andImage:codeImage]]; dispatch_async(dispatch_get_main_queue(), ^{ self.image = resultImage; });});}//这里的size我是用imageview的宽度来算的，你可以改为自己想要的size- (UIImage *)creatUIImageFromCIImage:(CIImage *)image andSize:(CGFloat)size { //下面是创建bitmao没什么好解释的,不懂得自行百度或者参考官方文档 CGRect extent = CGRectIntegral(image.extent); CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); size_t width = CGRectGetWidth(extent) * scale; size_t height = CGRectGetHeight(extent) * scale; CGColorSpaceRef colorRef = CGColorSpaceCreateDeviceGray(); CGContextRef contextRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorRef, (CGBitmapInfo)kCGImageAlphaNone); CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef imageRef = [context createCGImage:image fromRect:extent]; CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone); CGContextScaleCTM(contextRef, scale, scale); CGContextDrawImage(contextRef, extent, imageRef); CGImageRef newImage = CGBitmapContextCreateImage(contextRef); CGContextRelease(contextRef); CGImageRelease(imageRef); return [UIImage imageWithCGImage:newImage];}//这里将二维码上方的图片设置圆角并缩放- (UIImage *)imageCornerRadius:(CGFloat)cornerRadius andImage:(UIImage *)image { //这里是将图片进行处理，frame不能太大，否则会挡住二维码 CGRect frame = CGRectMake(0, 0, ImageSize/5, ImageSize/5); UIGraphicsBeginImageContextWithOptions(frame.size, NO, 0); [[UIBezierPath bezierPathWithRoundedRect:frame cornerRadius:cornerRadius] addClip]; [image drawInRect:frame]; UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return clipImage;}- (UIImage *)setSuperImage:(UIImage *)superImage andSubImage:(UIImage *)subImage { //将两张图片绘制在一起 UIGraphicsBeginImageContextWithOptions(superImage.size, YES, 0); [superImage drawInRect:CGRectMake(0, 0, superImage.size.width, superImage.size.height)]; [subImage drawInRect:CGRectMake((ImageSize - ImageSize/5)/2, (ImageSize - ImageSize/5)/2, subImage.size.width, subImage.size.height)]; UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return resultImage;}@end***************扫描二维码#import <UIKit/UIKit.h>#import <AVFoundation/AVFoundation.h>@interface ScanCodeViewController : UIViewController<AVCaptureMetadataOutputObjectsDelegate>{ AVCaptureSession * session; AVCaptureMetadataOutput * output; NSInteger lineNum; BOOL upOrDown; NSTimer *lineTimer;}@property (nonatomic, strong) UIImageView *lineImageView;@property (nonatomic, strong) UIImageView *backImageView;@end******************#import "ScanCodeViewController.h"@implementation ScanCodeViewController- (void)viewDidLoad { [super viewDidLoad]; if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0) { AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo]; if (authStatus == AVAuthorizationStatusDenied || authStatus == AVAuthorizationStatusRestricted) { [[[UIAlertView alloc] initWithTitle:nil message:@"本应用无访问相机的权限，如需访问，可在设置中修改" delegate:nil cancelButtonTitle:@"好的" otherButtonTitles:nil, nil] show]; return; } else { //打开相机 AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //创建输入流 AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; //创建输出流 output = [[AVCaptureMetadataOutput alloc]init]; //设置代理 在主线程里刷新 [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; //设置扫描区域，这个需要仔细调整 [output setRectOfInterest:CGRectMake(64/BCHeight, (BCWidth - 320)/2/BCWidth, 320/BCHeight, 320/BCWidth)]; //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 output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]; AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:session]; layer.videoGravity=AVLayerVideoGravityResizeAspectFill; layer.frame=self.view.layer.bounds; [self.view.layer addSublayer:layer]; } } [self _initView];}//里面所有的控件可以自己定制，这里只是简单的例子- (void)_initView { //扫码框 _backImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 64, BCWidth, BCHeight - 64)]; _backImageView.image = [UIImage imageNamed:@"camera_bg"]; [self.view addSubview:_backImageView]; _lineImageView = [[UIImageView alloc] initWithFrame:CGRectMake(16, 15, BCWidth - 32, 1)]; _lineImageView.backgroundColor = [UIColor orangeColor]; [_backImageView addSubview:_lineImageView]; //各种参数设置 lineNum = 0; upOrDown = NO; lineTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(lineAnimation) userInfo:nil repeats:YES];}-(void)lineAnimation { if (upOrDown == NO) { lineNum ++; _lineImageView.frame = CGRectMake(CGRectGetMinX(_lineImageView.frame), 15 + lineNum, BCWidth - 32, 1); CGFloat tempHeight = CGRectGetHeight(_backImageView.frame) * 321/542; NSInteger height = (NSInteger)tempHeight + 20; if (lineNum == height) { upOrDown = YES; } } else { lineNum --; _lineImageView.frame = CGRectMake(CGRectGetMinX(_lineImageView.frame), 15 + lineNum, BCWidth - 32, 1); if (lineNum == 0) { upOrDown = NO; } }}#pragma mark AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { if ([metadataObjects count] > 0) { [session stopRunning]; //停止扫码 AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects firstObject]; ResultViewController *resultVC = [[ResultViewController alloc] init]; resultVC.contentString = metadataObject.stringValue; [self.navigationController pushViewController:resultVC animated:NO]; }}- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [session startRunning]; [lineTimer setFireDate:[NSDate distantPast]];}- (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [session stopRunning]; [lineTimer setFireDate:[NSDate distantFuture]]; if (![self.navigationController.viewControllers containsObject:self]) {//释放timer [lineTimer invalidate]; lineTimer = nil; }}- (void)dealloc { NSLog(@"已释放");}@end*******吧识别的二维码信息传过来加载网页#import <UIKit/UIKit.h>@interface ResultViewController : UIViewController@property(nonatomic, retain)NSString *contentString;@end********#import "ResultViewController.h"#import <WebKit/WebKit.h>@implementation ResultViewController- (void)viewDidLoad { [super viewDidLoad]; //这个界面我只是简单的处理一下，可以自己定制,实际应用中扫码跳转不可能就这两种逻辑 if ([_contentString hasPrefix:@"http"]) { WKWebView *showView = [[WKWebView alloc] initWithFrame:BCScreen]; NSURLRequest *codeRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:_contentString]]; [showView loadRequest:codeRequest]; [self.view addSubview:showView]; } else { UILabel *showLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 80, 200, 50)]; showLabel.center = self.view.center; showLabel.font = [UIFont boldSystemFontOfSize:16]; showLabel.text = [NSString stringWithFormat:@"扫描结果是---%@",_contentString]; showLabel.numberOfLines = 0; [self.view addSubview:showLabel]; }}@end |
方式二：识别网页中的二维码
iOS WebView中 长按二维码的识别
思路:
长按webView 的过程中 截屏，再去解析是否有二维码，但是有个缺点 就是 万一截了一个 一半的二维码 那就无解了。
在webview中 注入获取点击图片的JS 获取图片，再解析。缺点：万一图片过大 需要下载，势必会影响用户体验。
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@interface CVWebViewController ()<UIGestureRecognizerDelegate>@property (weak, nonatomic) IBOutlet UIWebView *webView;@end@implementation CVWebViewController- (void)viewDidLoad{ [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://mp.weixin.qq.com/s?__biz=MzI2ODAzODAzMw==&mid=2650057120&idx=2&sn=c875f7d03ea3823e8dcb3dc4d0cff51d&scene=0#wechat_redirect"]]]; UILongPressGestureRecognizer *longPressed = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressed:)]; longPressed.delegate = self; [self.webView addGestureRecognizer:longPressed];}- (void)longPressed:(UITapGestureRecognizer*)recognizer{ if (recognizer.state != UIGestureRecognizerStateBegan) { return; } CGPoint touchPoint = [recognizer locationInView:self.webView]; NSString *js = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y]; NSString *imageUrl = [self.webView stringByEvaluatingJavaScriptFromString:js]; if (imageUrl.length == 0) { return; } NSLog(@"image url：%@",imageUrl); NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]]; UIImage *image = [UIImage imageWithData:data]; if (image) { //...... //save image or Extract QR code }}-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ return YES;} |
以上所述是小编给大家介绍的iOS模仿微信长按识别二维码的多种方式，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/u011146511/article/details/75645272
