本文共 11884 字,大约阅读时间需要 39 分钟。
参考:http://www.jianshu.com/p/997cec333822
参考:https://github.com/nglszs/BCQRcode
方式一:长按识别二维码
#import "LYBLongPressRecognizeEwmVC.h"
#import "UIImageView+CreatCode.h"
/** 补充的iOS9新特性*/
#import <SafariServices/SafariServices.h>
@interface LYBLongPressRecognizeEwmVC ()
@end
@implementation LYBLongPressRecognizeEwmVC
- (void)viewDidLoad {
[super viewDidLoad];
[self createErweima];
//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
if ([feature.messageString containsString:@"http"]) {
//4.1 创建SafariVC
SFSafariViewController *sfVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:feature.messageString]];
//4.2 弹出SafariVC
[self presentViewController:sfVC animated:YES completion:nil];
}
}
}
}
//创建二维码
-(void)createErweima{
UIImageView *imgV=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, WIDTH)];
[self.view addSubview:imgV];
[imgV creatCode:@"http://www.baidu.com" Image:nil andImageCorner:20];
}
@end
************生成二维码
#importNS_ASSUME_NONNULL_BEGIN@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;@endNS_ASSUME_NONNULL_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 {
[superviewDidLoad];
if ([[[UIDevicecurrentDevice]systemVersion]floatValue] >= 7.0) {
AVAuthorizationStatus authStatus = [AVCaptureDeviceauthorizationStatusForMediaType:AVMediaTypeVideo];
if (authStatus ==AVAuthorizationStatusDenied || authStatus ==AVAuthorizationStatusRestricted)
{
[[[UIAlertViewalloc]initWithTitle:nilmessage:@"本应用无访问相机的权限,如需访问,可在设置中修改"delegate:nilcancelButtonTitle:@"好的"otherButtonTitles:nil,nil]show];
return;
} else {
//打开相机
AVCaptureDevice * device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput * input = [AVCaptureDeviceInputdeviceInputWithDevice:deviceerror:nil];
//创建输出流
output = [[AVCaptureMetadataOutputalloc]init];
//设置代理在主线程里刷新
[outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];
//设置扫描区域,这个需要仔细调整
[outputsetRectOfInterest:CGRectMake(64/BCHeight, (BCWidth - 320)/2/BCWidth, 320/BCHeight, 320/BCWidth)];
//初始化链接对象
session = [[AVCaptureSessionalloc]init];
//高质量采集率
[sessionsetSessionPreset:AVCaptureSessionPresetHigh];
[sessionaddInput:input];
[sessionaddOutput:output];
//设置扫码支持的编码格式
output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code];
AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayerlayerWithSession:session];
layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
layer.frame=self.view.layer.bounds;
[self.view.layeraddSublayer: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 = [[UIImageViewalloc]initWithFrame:CGRectMake(0, 64,BCWidth,BCHeight - 64)];
_backImageView.image = [UIImageimageNamed:@"camera_bg"];
[self.viewaddSubview:_backImageView];
_lineImageView = [[UIImageViewalloc]initWithFrame:CGRectMake(16, 15,BCWidth - 32, 1)];
_lineImageView.backgroundColor = [UIColororangeColor];
[_backImageViewaddSubview:_lineImageView];
//各种参数设置
lineNum = 0;
upOrDown =NO;
lineTimer = [NSTimerscheduledTimerWithTimeInterval:0.01target:selfselector:@selector(lineAnimation)userInfo:nilrepeats: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 ([metadataObjectscount] > 0) {
[sessionstopRunning];//停止扫码
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjectsfirstObject];
ResultViewController *resultVC = [[ResultViewControlleralloc]init];
resultVC.contentString = metadataObject.stringValue;
[self.navigationControllerpushViewController:resultVCanimated:NO];
}
}
- (void)viewWillAppear:(BOOL)animated {
[superviewWillAppear:animated];
[sessionstartRunning];
[lineTimersetFireDate:[NSDatedistantPast]];
}
- (void)viewWillDisappear:(BOOL)animated {
[superviewWillDisappear:animated];
[sessionstopRunning];
[lineTimersetFireDate:[NSDatedistantFuture]];
if (![self.navigationController.viewControllers containsObject:self]) { //释放timer
[lineTimerinvalidate];
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 {
[superviewDidLoad];
//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 ([_contentStringhasPrefix:@"http"]) {
WKWebView *showView = [[WKWebViewalloc]initWithFrame:BCScreen];
NSURLRequest *codeRequest = [NSURLRequestrequestWithURL:[NSURLURLWithString:_contentString]];
[showView loadRequest:codeRequest];
[self.viewaddSubview:showView];
} else {
UILabel *showLabel = [[UILabelalloc]initWithFrame:CGRectMake(0, 80, 200, 50)];
showLabel.center =self.view.center;
showLabel.font = [UIFontboldSystemFontOfSize:16];
showLabel.text = [NSStringstringWithFormat:@"扫描结果是---%@",_contentString];
showLabel.numberOfLines = 0;
[self.viewaddSubview:showLabel];
}
}
@end
方式二:识别网页中的二维码
思路:
@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
{
returnYES;
}
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