iOS模仿微信长按识别二维码的多种方式

#import <UIKit/UIKit.h>@interface ViewController : UIViewController@end**************#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  self.title = @"二维码";  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

@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;}