实现长按点击网页的图片保存及二维码识别

1.网页添加长按手势

-(void)handleSingleTap:(UITapGestureRecognizer *)sender

{

CGPoint pt = [sender locationInView:_webView];

NSString *imgURL = [NSString stringWithFormat:@”document.elementFromPoint(%f, %f).src”, pt.x, pt.y];

NSString *urlToSave = [_webView stringByEvaluatingJavaScriptFromString:imgURL];

NSLog(@”image url=%@”, urlToSave);

if (urlToSave.length > 0)

{

//        NSString *turnString=[self decodeQRImageWith:[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:urlToSave]]]];

//        NSString *turnString=@”https://itunes.apple.com/cn/app/zhuo-yue-hui/id1159685485?mt=8″;

NSString *turnString=@”http://mp.weixin.qq.com/s?__biz=MzA5ODU1MzQxMg==&mid=2650930327&idx=3&sn=7c91c7e233d623dad1b48e80f837c9e6&chksm=8b7a87bcbc0d0eaaf5f7d507aa00f906e477551c67805f3a85bd2a4949223dfdf52320864b47&scene=0#wechat_redirect”;

NSLog(@”theturnimg—%@”,turnString);

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@”取消” style:UIAlertActionStyleCancel handler:^(UIAlertAction *action)

{

NSLog(@”取消”);

}];

UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@”保存图片” style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)

{

NSLog(@”保存图片”);

UIImage *image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:urlToSave]]];

UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}];

UIAlertAction *otherActionTwo = [UIAlertAction actionWithTitle:@”识别图中的二维码” style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)

{

NSLog(@”识别图中的二维码”);

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:turnString]];

}];

if ([turnString hasPrefix:@”http”])

{

NSLog(@”是网址”);

[alertController addAction:cancelAction];

[alertController addAction:otherAction];

[alertController addAction:otherActionTwo];

[self presentViewController:alertController animated:YES completion:nil];

}

else

{

NSLog(@”不是网址”);

[alertController addAction:cancelAction];

[alertController addAction:otherAction];

[self presentViewController:alertController animated:YES completion:nil];

}

}

}

2.导入ZBar SDK

下面的方法是zbar识别图片网址,如果图片是二维码的话,会返回一个网址,如果不是二维码的话,不会返回网址(这个逻辑,期待被打破)

– (NSString *)decodeQRImageWith:(UIImage*)aImage {

NSString *qrResult = nil;

//iOS8及以上可以使用系统自带的识别二维码图片接口,但此api有问题,在一些机型上detector为nil。

//    if (iOS8_OR_LATER) {

//        CIContext *context = [CIContext contextWithOptions:nil];

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

//        CIImage *image = [CIImage imageWithCGImage:aImage.CGImage];

//        NSArray *features = [detector featuresInImage:image];

//        CIQRCodeFeature *feature = [features firstObject];

//

//        qrResult = feature.messageString;

//    } else {

ZBarReaderController* read = [ZBarReaderController new];

CGImageRef cgImageRef = aImage.CGImage;

ZBarSymbol* symbol = nil;

for(symbol in [read scanImage:cgImageRef]) break;

qrResult = symbol.data ;

return qrResult;

}

3.保存图片到本地

– (void)image:(UIImage *)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo

{

if (error)

{

NSLog(@”Error”);

[SVProgressHUD showErrorWithStatus:@”保存失败”];

}

else

{

NSLog(@”OK”);

[SVProgressHUD showSuccessWithStatus:@”成功保存”];

}

}

附上代码

////  ChamberIntroduceViewController.m//  BnPlus////  Created by 密码123 on 16/11/4.//  Copyright © 2016年 Sgs. All rights reserved.//#import “ZBarSDK.h”#import “ChamberIntroduceViewController.h”@interface ChamberIntroduceViewController (){

UIWebView *_webView;

}

@end

@implementation ChamberIntroduceViewController

– (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

[self initWeb];

}

-(void)initWeb

{

_webView = [[UIWebView alloc] initWithFrame:CGRectMake(0,NaviBarHeight+20, kScreenWidth, kScreenHeight-NaviBarHeight-20)];

_webView.backgroundColor = [UIColor whiteColor];

_webView.delegate=self;

[self.view addSubview:_webView];

NSString *urlString=[NSString stringWithFormat:@”%@/web/allyexplain?allyid=%@”,weixinURL,[UserInfoModel sharedUserInfoModel].currentChamberModel.allyId];

//    NSString *urlString=@”http://wxpay.weixin.qq.com/pub_v2/pay/wap.v2.php”;

[_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];

[self addTapOnWebView];

}

-(void)addTapOnWebView

{

UILongPressGestureRecognizer *longPressGR =[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleSingleTap:)];

longPressGR.minimumPressDuration=0.48;

longPressGR.delegate=self;

[_webView addGestureRecognizer:longPressGR];

longPressGR.cancelsTouchesInView = NO;

}

#pragma mark- TapGestureRecognizer

– (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer

{

return YES;

}

-(void)handleSingleTap:(UITapGestureRecognizer *)sender

{

CGPoint pt = [sender locationInView:_webView];

NSString *imgURL = [NSString stringWithFormat:@”document.elementFromPoint(%f, %f).src”, pt.x, pt.y];

NSString *urlToSave = [_webView stringByEvaluatingJavaScriptFromString:imgURL];

NSLog(@”image url=%@”, urlToSave);

if (urlToSave.length > 0)

{

NSString *turnString=[self decodeQRImageWith:[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:urlToSave]]]];

//        NSString *turnString=@”https://itunes.apple.com/cn/app/zhuo-yue-hui/id1159685485?mt=8″;

NSLog(@”theturnimg—%@”,turnString);

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@”取消” style:UIAlertActionStyleCancel handler:^(UIAlertAction *action)

{

NSLog(@”取消”);

}];

UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@”保存图片” style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)

{

NSLog(@”保存图片”);

UIImage *image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:urlToSave]]];

UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}];

UIAlertAction *otherActionTwo = [UIAlertAction actionWithTitle:@”识别图中的二维码” style:UIAlertActionStyleDefault handler:^(UIAlertAction *action)

{

NSLog(@”识别图中的二维码”);

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:turnString]];

}];

if ([turnString hasPrefix:@”http”])

{

NSLog(@”是网址”);

[alertController addAction:cancelAction];

[alertController addAction:otherAction];

[alertController addAction:otherActionTwo];

[self presentViewController:alertController animated:YES completion:nil];

}

else

{

NSLog(@”不是网址”);

[alertController addAction:cancelAction];

[alertController addAction:otherAction];

[self presentViewController:alertController animated:YES completion:nil];

}

}

}

– (void)image:(UIImage *)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo

{

if (error)

{

NSLog(@”Error”);

[SVProgressHUD showErrorWithStatus:@”保存失败”];

}

else

{

NSLog(@”OK”);

[SVProgressHUD showSuccessWithStatus:@”成功保存”];

}

}

#pragma mark – webdelegate

-(void) webViewDidFinishLoad:(UIWebView *)webView

{

[UIApplication sharedApplication].networkActivityIndicatorVisible =NO;

NSString *title2 = [webView stringByEvaluatingJavaScriptFromString:@”document.title”];

[self setNavtitleItem:title2];

}

#pragma mark -ZBardelegate

– (NSString *)decodeQRImageWith:(UIImage*)aImage {

NSString *qrResult = nil;

//iOS8及以上可以使用系统自带的识别二维码图片接口,但此api有问题,在一些机型上detector为nil。

//    if (iOS8_OR_LATER) {

//        CIContext *context = [CIContext contextWithOptions:nil];

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

//        CIImage *image = [CIImage imageWithCGImage:aImage.CGImage];

//        NSArray *features = [detector featuresInImage:image];

//        CIQRCodeFeature *feature = [features firstObject];

//

//        qrResult = feature.messageString;

//    } else {

ZBarReaderController* read = [ZBarReaderController new];

CGImageRef cgImageRef = aImage.CGImage;

ZBarSymbol* symbol = nil;

for(symbol in [read scanImage:cgImageRef]) break;

qrResult = symbol.data ;

return qrResult;

}

– (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

/*

#pragma mark – Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

– (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

@end

demohttps://github.com/Yijijianghu/CheckQrCodeImageOfWebPage

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